Petrogenesis of the Concealed Monzogranite in the Bainiuchang Ag-polymetallic Deposit, Southeastern Yunnan, and Its Implications for Ag-polymetallic Mineralization: Constraints from U-Pb Geochronology, Geochemistry, and Hf Isotopes

doi:10.19657/j.geoscience.1000-8527.2024.119

Abstract

Abstract:

The Bainiuchang silver polymetallic deposit, one of the super-large deposits in southeastern Yunnan, is located in the northwestern part of Bozhu Mountain, southeastern Yunnan. Based on systematic fieldwork, this study conducted LA-ICP-MS zircon U-Pb dating, whole-rock geochemical analysis, and zircon Lu-Hf isotope analysis on the concealed monzogranite in Bainiuchang to determine the formation age, genesis, magma source, and alteration effects of the deep concealed granite. Combined with the tectonic setting, the relationship between the concealed granite and mineralization was analyzed. The results show that the zircon U-Pb ages of four monzogranite samples from Bainiuchang are (87.7±0.5) Ma, (87.34±0.4) Ma, (88.5±0.5) Ma, and (87.1±0.5) Ma, respectively, all belonging to the late Yanshanian period. The Bainiuchang monzogranite is characterized by high silicon (SiO₂=66.27%-73.77%) and high alkali (Na₂O+K₂O=6.17%-8.48%) contents, with high total rare earth elements (ΣREE=172.49×10^-6-333.22×10^-6, average 271.30×10^-6), obvious fractionation of light and heavy rare earth elements (LREE/HREE=12.74-20.47, average 16.76), and weak negative Eu anomalies (0.44-0.78). It is relatively enriched in large ion lithophile elements (Rb, K) and high field strength elements (Th, U, Ce, Zr, Hf, Ta), belonging to peraluminous high-K calc-alkaline S-type granite. The zircon ε_Hf(t) values of the Bainiuchang monzogranite range from -21.5 to -4.3, with corresponding two-stage Hf model ages of 1259-1614 Ma, indicating that the magma was derived from the melting of Mesoproterozoic-Neoproterozoic ancient crustal materials. Comprehensive analysis suggests that the formation of the Bainiuchang F3 fault provided migration channels and space for deep magmatic activity in the study area. The upwelling of granitic magma transported ore-forming elements such as Sn, Cu, and Zn, and consolidated to form the deep concealed granite. The formation of the deep concealed monzogranite in Bainiuchang is closely related to the tectonic transition from syn-collision to post-collision orogeny in the late Yanshanian period.

Key words: zircon U-Pb dating, LA-ICP-MS, monzogranite, deep concealed granite body, Bainiuchang

CLC Number:

P611

MI Xue, LIU Xuelong, ZHANG Shitao, CHEN Shufu, MENG Guangzhi, ZHANG Hong, CHENG Jialong, ZHOU Jiehu, LU Bode, DAO Junshan, SHI Nan, FAN Maohuang. Petrogenesis of the Concealed Monzogranite in the Bainiuchang Ag-polymetallic Deposit, Southeastern Yunnan, and Its Implications for Ag-polymetallic Mineralization: Constraints from U-Pb Geochronology, Geochemistry, and Hf Isotopes[J]. Geoscience, 2025, 39(04): 1016-1038.

Figures/Tables 16

Fig.1 Tectonic map and simplified geological map of the Bainiuchang mining area ((a) modified from Zhang Yahui [11]; (b), (c) modified from reference [12])

Fig.2 Exploration line profile of Line 74 in the Bainiuchang silver-polymetallic deposit (modified from Wang [10])

Fig.3 Typical photos and petrographic characteristics of the Bainiuchang granite mass under an orthogonal polarizing microscope

Fig.4 Typical zircon CL images of Bainiuchang (red circles indicate zircon U-Pb dating points; yellow circles indicate Hf isotope measurement points)

Table 1 LA-ICP-MS zircon U-Pb isotope analysis results of the Bainiuchang monzogranite

测点号	元素含量			Th/U	同位素比值			同位素年龄(Ma)			谐和度 (%)
测点号	Pb (10^-6)	Th (10^-6)	U (10^-6)	Th/U	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	$207$ Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	谐和度 (%)
BNC22-38二长花岗岩
BN22-38-1	28.2	1130.0	1621.0	0.7	0.0640± 0.0021	0.1242± 0.0041	0.0141± 0.0002	743.0±68.5	119.0±3.7	90.0±1.1	72
BN22-38-2	26.0	1137.0	1576.0	0.7	0.0505± 0.0018	0.0949± 0.0034	0.0136± 0.0001	220.0±85.2	92.1±3.2	87.1±0.9	94
BN22-38-3	28.5	760.0	1302.0	0.6	0.1186± 0.0044	0.2545± 0.0095	0.0155± 0.0002	1944.0±32.9	230.0±7.7	99.3±1.0	20
BN22-38-4	24.4	660.0	1532.0	0.4	0.0507± 0.0022	0.0972± 0.0038	0.0141± 0.0002	233.0±98.14	94.2±3.6	90.0±1.0	95
BN22-38-5	12.5	892.0	639.0	1.4	0.0520± 0.0031	0.0988± 0.0057	0.0139± 0.0002	287.0±135.2	95.7±5.3	89.2±1.3	92
BN22-38-6	19.3	437.0	1286.0	0.3	0.0468± 0.0020	0.0890± 0.0037	0.0139± 0.0002	35.3±103.7	86.6±3.4	88.8±1.0	97
BN22-38-7	27.4	1345.0	1601.0	0.8	0.0511± 0.0018	0.0977± 0.0032	0.0140± 0.0002	243.0±79.6	94.6±3.0	89.3±1.0	94
BN22-38-8	17.6	348.0	1195.0	0.3	0.0505± 0.0022	0.0951± 0.0041	0.0136± 0.0001	217.0±97.2	92.2±3.8	87.2±0.9	94
BN22-38-9	16.9	347.0	1124.0	0.3	0.0478± 0.0021	0.0916± 0.0040	0.0138± 0.0002	100.0±94.4	88.9±3.8	88.5±1.0	99
BN22-38-10	18.5	727.0	1169.0	0.6	0.0469± 0.0029	0.0861± 0.0044	0.0135± 0.0002	55.7±131.5	83.9±4.1	86.7±1.5	96
BN22-38-11	22.3	737.0	1417.0	0.5	0.0523± 0.0022	0.0989± 0.0039	0.0137± 0.0001	298.0±89.8	95.7±3.7	87.6±0.9	91
BN22-38-12	29.9	727.0	2066.0	0.4	0.0515± 0.0025	0.0979± 0.0054	0.0137± 0.0002	261.0±111.1	94.9±5.0	87.5±1.4	91
BN22-38-13	23.3	696.0	1509.0	0.5	0.0490± 0.0018	0.0928± 0.0035	0.0136± 0.0001	146.0±85.2	90.1±3.2	87.3±0.9	96
BN22-38-14	26.0	1441.0	1474.0	1.0	0.0491± 0.0017	0.0934± 0.0032	0.0137± 0.0001	154.0±76.8	90.7±3.00	88.0±0.8	97
BN22-38-15	16.7	528.0	1095.0	0.5	0.0476± 0.0021	0.0885± 0.0037	0.0135± 0.0002	79.7±103.7	86.1±3.5	86.7±1.0	99
BN22-38-16	20.4	564.0	1355.0	0.4	0.0474± 0.0020	0.0888± 0.0035	0.0136± 0.0002	77.9±87.0	86.4±3.3	87.1±1.00	99
BN22-38-17	20.5	766.0	1275.0	0.6	0.0508± 0.0021	0.0963± 0.0039	0.0137± 0.0002	232.0±62.0	93.3±3.6	87.9±1.0	93
BN22-38-18	27.7	1344.0	1642.0	0.8	0.0535± 0.0020	0.1002± 0.0036	0.0136± 0.0002	350.0±83.3	96.9±3.3	86.9±1.0	89
BN22-38-19	17.6	563.0	1148.0	0.5	0.0515± 0.0024	0.0953± 0.0045	0.0135± 0.0001	265.0±109.2	92.5±4.2	86.3±0.9	93
BN22-38-20	24.6	761.0	1643.0	0.5	0.0522± 0.0020	0.0980± 0.0041	0.0136± 0.0002	295.0±88.9	94.9±3.8	87.3±1.5	91
BNC22-39二长花岗岩
BN22-39-01	22.4	1105.0	1337.0	0.8	0.0498± 0.0019	0.0933± 0.0036	0.0135± 0.0001	187.0±88.0	90.5±3.4	86.7±0.8	95
BN22-39-02	17.5	973.0	976.0	1.0	0.0519± 0.0023	0.0991± 0.0043	0.0138± 0.0001	280.0±100.0	96.0±4.00	88.4±0.9	91
BN22-39-03	17.8	376.0	1205.0	0.3	0.0463± 0.0018	0.0879± 0.0034	0.0138± 0.0002	13.0±88.9	85.6±3.2	88.5±1.1	96
BN22-39-04	16.5	600.0	1066.0	0.6	0.0486± 0.0021	0.0889± 0.0037	0.0133± 0.0002	132.0±97.2	86.5±3.5	87.3±1.0	96
BN22-39-05	16.4	510.0	1038.0	0.5	0.0456± 0.0020	0.0870± 0.0037	0.0139± 0.0002	101.0±104.3	84.7±3.5	88±1.0	96
BN22-39-06	16.6	776.0	996.0	0.8	0.0506± 0.0023	0.0938± 0.0042	0.0135± 0.0002	220.0±109.2	91.0±3.9	87.5±1.00	96
BN22-39-07	14.5	476.0	937.0	0.5	0.0499± 0.0023	0.0917± 0.0042	0.0133± 0.0002	187.0±110.2	89.1±4.0	87.7±1.1	97
BN22-39-08	15.1	491.0	955.0	0.5	0.0494± 0.0021	0.0922± 0.0038	0.0135± 0.0001	169.0±98.1	89.6±3.5	87.1±0.9	97
BN22-39-09	13.7	481.0	875.0	0.6	0.0481± 0.0021	0.0879± 0.0037	0.0133± 0.0001	106.0±103.7	85.5±3.5	86.3±0.9	98
BN22-39-10	17.6	500.0	1146.0	0.4	0.0484± 0.0020	0.0899± 0.0038	0.0134± 0.0001	120.0±100.0	87.4±3.5	87.3±0.9	98
BN22-39-11	22.6	452.0	1652.0	0.3	0.0498± 0.0016	0.0868± 0.0027	0.0126± 0.0002	187.0±67.6	84.5±2.6	87.1±1.1	93
BN22-39-12	20.9	599.0	1368.0	0.4	0.0519± 0.0019	0.0964± 0.0036	0.0134± 0.0002	280.0±83.3	93.4±3.3	87.6±1.0	92
BN22-39-13	22.6	863.0	1383.0	0.6	0.0492± 0.0018	0.0933± 0.0035	0.0137± 0.0002	167.0±82.4	90.6±3.2	87.9±1.1	96
BN22-39-14	18.8	637.0	1230.0	0.5	0.0491± 0.0021	0.0905± 0.0038	0.0134± 0.0002	154.0±100.0	88.0±3.5	86.9±1.1	99
BN22-39-15	11.7	255.0	810.0	0.3	0.0512± 0.0026	0.0941± 0.0047	0.0135± 0.0002	250.0±114.8	91.4±4.4	87.4±1.3	94
BN22-39-16	16.3	497.0	1063.0	0.5	0.0481± 0.0020	0.0894± 0.0036	0.0134± 0.0001	106.0±4.4	86.9±3.4	87.4±0.85	97
BN22-39-17	15.5	506.0	1008.0	0.5	0.0498± 0.0025	0.0913± 0.0046	0.0133± 0.0001	183.0±118.5	88.7±4.3	86.4±0.9	97
BN22-39-18	18.6	704.0	1186.0	0.6	0.0499± 0.0018	0.0918± 0.0032	0.0133± 0.0001	191.0±81.5	89.2±3.0	86.8±0.9	99
BN22-39-19	13.2	348.0	865.0	0.4	0.0465± 0.0021	0.0873± 0.0038	0.0137± 0.0002	20.0±103.7	85.0±3.5	87.7±1.0	96
BN22-39-20	24.6	1129.0	1428.0	0.8	0.0483± 0.0016	0.0925± 0.0034	0.0138± 0.0002	122.0±81.5	89.8±3.2	88.6±1.2	98
BNC22-59二长花岗岩
BN22-59-1	19.6	531.0	1274.0	0.4	0.0487± 0.0019	0.0923± 0.0035	0.0139± 0.0002	132.0±92.6	89.7±3.3	88.7±1.0	98
BN22-59-2	22.5	609.0	1444.0	0.4	0.0490± 0.0017	0.0940± 0.0033	0.0138± 0.0001	150.0±75.0	91.2±3.1	88.6±0.9	97
BN22-59-3	29.0	900.0	1783.0	0.5	0.0517± 0.0019	0.1024± 0.0041	0.0143± 0.0002	272.0±83.3	99.0±3.7	91.4±1.4	92
BN22-59-4	17.1	276.0	1161.0	0.2	0.0488± 0.0020	0.0927± 0.0037	0.0138± 0.0001	200.0±94.4	90.0±3.4	88.4±0.8	98
BN22-59-5	35.5	1433.0	1999.0	0.7	0.0529± 0.0018	0.1083± 0.0037	0.0149± 0.0003	324.0±105.5	104.0±3.4	95.6±1.7	91
BN22-59-6	38.9	1263.0	2466.0	0.5	0.0523± 0.0018	0.1021± 0.0035	0.0142± 0.0002	302.0±77.8	98.7±3.2	90.6±1.3	91
BN22-59-7	19.7	737.0	1217.0	0.6	0.0497± 0.0020	0.0956± 0.0039	0.0139± 0.0002	189.0±94.4	92.7±3.6	89.2±1.1	96
BN22-59-8	18.1	632.0	1132.0	0.6	0.0479± 0.0020	0.0910± 0.0036	0.0138± 0.0002	94.5±92.6	88.5±3.3	88.6±1.1	99
BN22-59-9	37.9	751.0	2554.0	0.3	0.0646± 0.0240	0.1180± 0.0413	0.0137± 0.0002	761.0±634.9	113.0±37.5	87.5±1.0	74
BN22-59-10	20.3	770.0	1239.0	0.6	0.0487± 0.0018	0.0938± 0.0035	0.0139± 0.0001	132.0±87.0	91.0±3.2	89.1±0.9	97
BN22-59-11	30.8	1556.0	1859.0	0.8	0.0466± 0.0026	0.0898± 0.0055	0.0138± 0.0002	31.6±135.2	87.3±5.1	88.3±1.3	98
BN22-59-12	16.2	444.0	1047.0	0.4	0.0508± 0.0020	0.0972± 0.0039	0.0138± 0.0002	235.0±88.9	94.2±3.6	88.1±1.0	93
BN22-59-13	13.8	378.0	907.0	0.4	0.0472± 0.0025	0.0875± 0.0046	0.0135± 0.0001	61.2±127.8	85.2±4.3	86.5±1.0	98
BN22-59-14	20.7	885.0	1278.0	0.7	0.0469± 0.0018	0.0888± 0.0034	0.0137± 0.0002	42.7±88.9	86.4±3.2	87.9±1.1	98
BN22-59-15	25.2	374.0	1784.0	0.2	0.0474± 0.0020	0.0902± 0.0037	0.0138± 0.0002	77.9±87.0	87.7±3.5	88.2±1.3	99
BN22-59-16	18.4	637.0	1146.0	0.6	0.0515± 0.0022	0.0996± 0.0050	0.0139± 0.0003	265.0±100.0	96.4±4.6	88.8±1.9	91
BN22-59-17	12.0	282.0	812.0	0.3	0.0461± 0.0021	0.0871± 0.0041	0.0136± 0.0002	400.0±290.7	84.8±3.9	87.4±1.2	96
BN22-59-18	27.3	901.0	1725.0	0.5	0.0458± 0.0047	0.0929± 0.0127	0.0137± 0.0004	323.0±100.0	90.2±11.8	87.5±2.8	96
BN22-59-19	19.5	646.0	1067.0	0.6	0.0651± 0.0024	0.1360± 0.0057	0.0149± 0.0002	776.0±79.6	129.0±5.0	95.6±1.3	69
BN22-59-20	34.5	1371.0	1856.0	0.7	0.0871± 0.0022	0.1655± 0.0042	0.0139± 0.0002	1363.0±44.3	156.0±3.7	88.7±1.4	45
BNC22-64二长花岗岩
BN22-64-1	15.9	590.0	975.0	0.6	0.0517± 0.0022	0.0971± 0.0042	0.0136± 0.0002	272.0±98.1	94.1±3.9	86.8±1.0	91
BN22-64-2	17.9	299.0	1207.0	0.3	0.0465± 0.0020	0.0874± 0.0036	0.0137± 0.0001	33.4±87.0	85.1±3.4	87.7±0.8	97
BN22-64-3	32.4	900.0	2283.0	0.4	0.0461± 0.0038	0.0838± 0.0075	0.0137± 0.0005	400.0±205.6	81.7±7.0	87.5±3.2	93
BN22-64-4	30.8	768.0	2194.0	0.4	0.0533± 0.0069	0.0959± 0.0119	0.0133± 0.0006	343.0±298.1	93.0±11.0	85.3±3.8	91
BN22-64-5	23.4	741.0	1454.0	0.5	0.0523± 0.0018	0.0987± 0.0034	0.0137± 0.0001	302.0±84.3	95.6±3.1	87.7±0.9	91
BN22-64-6	20.8	699.0	1310.0	0.5	0.0506± 0.0016	0.0948± 0.0031	0.0136± 0.0001	233.0±74.1	91.9±2.9	87.0±0.9	94
BN22-64-7	21.4	713.0	1323.0	0.5	0.0504± 0.0019	0.0955± 0.0036	0.0137± 0.0002	213.0±85.2	92.6±3.3	88.0±1.0	94
BN22-64-8	25.0	413.0	1735.0	0.2	0.0481± 0.0033	0.0902± 0.0062	0.0135± 0.0002	102.0±155.5	87.7±5.8	86.7±1.2	98
BN22-64-9	26.2	749.0	1642.0	0.5	0.0510± 0.0018	0.0970± 0.0033	0.0139± 0.0002	239.0±83.3	94.0±3.1	88.7±1.1	94
BN22-64-10	17.4	545.0	1104.0	0.5	0.0478± 0.0019	0.0892± 0.0034	0.0136± 0.0002	87.1±88.9	86.7±3.2	86.9±1.0	99
BN22-64-11	24.1	422.0	1565.0	0.3	0.0526± 0.0018	0.0999± 0.0034	0.0138± 0.0002	322.0±77.8	96.6±3.1	88.1±1.1	90
BN22-64-12	22.8	608.0	1452.0	0.4	0.0487± 0.0019	0.0918± 0.0036	0.0137± 0.0001	132.0±92.6	89.2±3.4	87.5±0.9	98
BN22-64-13	27.5	834.0	1798.0	0.5	0.0478± 0.0048	0.0841± 0.0064	0.0140± 0.0005	100.0±209.2	82.0±6.0	89.6± 2.9	91
BN22-64-14	23.3	351.0	1590.0	0.2	0.0465± 0.0019	0.0875± 0.0037	0.0136± 0.0001	33.4±83.3	85.2±3.4	86.9±0.9	97
BN22-64-15	18.7	472.0	1214.0	0.4	0.0492± 0.0033	0.0889± 0.0046	0.0137± 0.0003	167.0±138.9	86.4±4.3	87.5±1.7	98
BN22-64-16	24.7	1065.0	1454.0	0.7	0.0501± 0.0022	0.0938± 0.0039	0.0137± 0.0002	211.0±103.7	91.0±3.6	87.7± 1.0	96
BN22-64-17	21.7	354.0	1486.0	0.2	0.0486± 0.0017	0.0898± 0.0033	0.0134± 0.0001	132.0±85.2	87.3±3.1	85.7± 0.9	98
BN22-64-18	11.9	392.0	756.0	0.5	0.0517± 0.0026	0.0952± 0.0048	0.0134± 0.0002	333.0±118.5	92.4±4.5	86.0±1.	92
BN22-64-19	23.0	715.0	1472.0	0.5	0.0506± 0.0020	0.0943± 0.0037	0.0135± 0.0001	233.0±95.4	91.5±3.4	86.7±0.9	94
BN22-64-20	14.7	445.0	963.0	0.5	0.0501± 0.0023	0.0919± 0.0041	0.0134± 0.0001	198.0±99.1	89.3±3.8	85.7± 0.9	95

Table 1 LA-ICP-MS zircon U-Pb isotope analysis results of the Bainiuchang monzogranite

测点号	元素含量			Th/U	同位素比值			同位素年龄(Ma)			谐和度 (%)
测点号	Pb (10^-6)	Th (10^-6)	U (10^-6)	Th/U	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	²⁰⁷Pb/²⁰⁶Pb ±1σ	$207$ Pb/²⁰⁶Pb ±1σ	²⁰⁷Pb/²³⁵U ±1σ	²⁰⁶Pb/²³⁸U ±1σ	谐和度 (%)
BNC22-38二长花岗岩
BN22-38-1	28.2	1130.0	1621.0	0.7	0.0640± 0.0021	0.1242± 0.0041	0.0141± 0.0002	743.0±68.5	119.0±3.7	90.0±1.1	72
BN22-38-2	26.0	1137.0	1576.0	0.7	0.0505± 0.0018	0.0949± 0.0034	0.0136± 0.0001	220.0±85.2	92.1±3.2	87.1±0.9	94
BN22-38-3	28.5	760.0	1302.0	0.6	0.1186± 0.0044	0.2545± 0.0095	0.0155± 0.0002	1944.0±32.9	230.0±7.7	99.3±1.0	20
BN22-38-4	24.4	660.0	1532.0	0.4	0.0507± 0.0022	0.0972± 0.0038	0.0141± 0.0002	233.0±98.14	94.2±3.6	90.0±1.0	95
BN22-38-5	12.5	892.0	639.0	1.4	0.0520± 0.0031	0.0988± 0.0057	0.0139± 0.0002	287.0±135.2	95.7±5.3	89.2±1.3	92
BN22-38-6	19.3	437.0	1286.0	0.3	0.0468± 0.0020	0.0890± 0.0037	0.0139± 0.0002	35.3±103.7	86.6±3.4	88.8±1.0	97
BN22-38-7	27.4	1345.0	1601.0	0.8	0.0511± 0.0018	0.0977± 0.0032	0.0140± 0.0002	243.0±79.6	94.6±3.0	89.3±1.0	94
BN22-38-8	17.6	348.0	1195.0	0.3	0.0505± 0.0022	0.0951± 0.0041	0.0136± 0.0001	217.0±97.2	92.2±3.8	87.2±0.9	94
BN22-38-9	16.9	347.0	1124.0	0.3	0.0478± 0.0021	0.0916± 0.0040	0.0138± 0.0002	100.0±94.4	88.9±3.8	88.5±1.0	99
BN22-38-10	18.5	727.0	1169.0	0.6	0.0469± 0.0029	0.0861± 0.0044	0.0135± 0.0002	55.7±131.5	83.9±4.1	86.7±1.5	96
BN22-38-11	22.3	737.0	1417.0	0.5	0.0523± 0.0022	0.0989± 0.0039	0.0137± 0.0001	298.0±89.8	95.7±3.7	87.6±0.9	91
BN22-38-12	29.9	727.0	2066.0	0.4	0.0515± 0.0025	0.0979± 0.0054	0.0137± 0.0002	261.0±111.1	94.9±5.0	87.5±1.4	91
BN22-38-13	23.3	696.0	1509.0	0.5	0.0490± 0.0018	0.0928± 0.0035	0.0136± 0.0001	146.0±85.2	90.1±3.2	87.3±0.9	96
BN22-38-14	26.0	1441.0	1474.0	1.0	0.0491± 0.0017	0.0934± 0.0032	0.0137± 0.0001	154.0±76.8	90.7±3.00	88.0±0.8	97
BN22-38-15	16.7	528.0	1095.0	0.5	0.0476± 0.0021	0.0885± 0.0037	0.0135± 0.0002	79.7±103.7	86.1±3.5	86.7±1.0	99
BN22-38-16	20.4	564.0	1355.0	0.4	0.0474± 0.0020	0.0888± 0.0035	0.0136± 0.0002	77.9±87.0	86.4±3.3	87.1±1.00	99
BN22-38-17	20.5	766.0	1275.0	0.6	0.0508± 0.0021	0.0963± 0.0039	0.0137± 0.0002	232.0±62.0	93.3±3.6	87.9±1.0	93
BN22-38-18	27.7	1344.0	1642.0	0.8	0.0535± 0.0020	0.1002± 0.0036	0.0136± 0.0002	350.0±83.3	96.9±3.3	86.9±1.0	89
BN22-38-19	17.6	563.0	1148.0	0.5	0.0515± 0.0024	0.0953± 0.0045	0.0135± 0.0001	265.0±109.2	92.5±4.2	86.3±0.9	93
BN22-38-20	24.6	761.0	1643.0	0.5	0.0522± 0.0020	0.0980± 0.0041	0.0136± 0.0002	295.0±88.9	94.9±3.8	87.3±1.5	91
BNC22-39二长花岗岩
BN22-39-01	22.4	1105.0	1337.0	0.8	0.0498± 0.0019	0.0933± 0.0036	0.0135± 0.0001	187.0±88.0	90.5±3.4	86.7±0.8	95
BN22-39-02	17.5	973.0	976.0	1.0	0.0519± 0.0023	0.0991± 0.0043	0.0138± 0.0001	280.0±100.0	96.0±4.00	88.4±0.9	91
BN22-39-03	17.8	376.0	1205.0	0.3	0.0463± 0.0018	0.0879± 0.0034	0.0138± 0.0002	13.0±88.9	85.6±3.2	88.5±1.1	96
BN22-39-04	16.5	600.0	1066.0	0.6	0.0486± 0.0021	0.0889± 0.0037	0.0133± 0.0002	132.0±97.2	86.5±3.5	87.3±1.0	96
BN22-39-05	16.4	510.0	1038.0	0.5	0.0456± 0.0020	0.0870± 0.0037	0.0139± 0.0002	101.0±104.3	84.7±3.5	88±1.0	96
BN22-39-06	16.6	776.0	996.0	0.8	0.0506± 0.0023	0.0938± 0.0042	0.0135± 0.0002	220.0±109.2	91.0±3.9	87.5±1.00	96
BN22-39-07	14.5	476.0	937.0	0.5	0.0499± 0.0023	0.0917± 0.0042	0.0133± 0.0002	187.0±110.2	89.1±4.0	87.7±1.1	97
BN22-39-08	15.1	491.0	955.0	0.5	0.0494± 0.0021	0.0922± 0.0038	0.0135± 0.0001	169.0±98.1	89.6±3.5	87.1±0.9	97
BN22-39-09	13.7	481.0	875.0	0.6	0.0481± 0.0021	0.0879± 0.0037	0.0133± 0.0001	106.0±103.7	85.5±3.5	86.3±0.9	98
BN22-39-10	17.6	500.0	1146.0	0.4	0.0484± 0.0020	0.0899± 0.0038	0.0134± 0.0001	120.0±100.0	87.4±3.5	87.3±0.9	98
BN22-39-11	22.6	452.0	1652.0	0.3	0.0498± 0.0016	0.0868± 0.0027	0.0126± 0.0002	187.0±67.6	84.5±2.6	87.1±1.1	93
BN22-39-12	20.9	599.0	1368.0	0.4	0.0519± 0.0019	0.0964± 0.0036	0.0134± 0.0002	280.0±83.3	93.4±3.3	87.6±1.0	92
BN22-39-13	22.6	863.0	1383.0	0.6	0.0492± 0.0018	0.0933± 0.0035	0.0137± 0.0002	167.0±82.4	90.6±3.2	87.9±1.1	96
BN22-39-14	18.8	637.0	1230.0	0.5	0.0491± 0.0021	0.0905± 0.0038	0.0134± 0.0002	154.0±100.0	88.0±3.5	86.9±1.1	99
BN22-39-15	11.7	255.0	810.0	0.3	0.0512± 0.0026	0.0941± 0.0047	0.0135± 0.0002	250.0±114.8	91.4±4.4	87.4±1.3	94
BN22-39-16	16.3	497.0	1063.0	0.5	0.0481± 0.0020	0.0894± 0.0036	0.0134± 0.0001	106.0±4.4	86.9±3.4	87.4±0.85	97
BN22-39-17	15.5	506.0	1008.0	0.5	0.0498± 0.0025	0.0913± 0.0046	0.0133± 0.0001	183.0±118.5	88.7±4.3	86.4±0.9	97
BN22-39-18	18.6	704.0	1186.0	0.6	0.0499± 0.0018	0.0918± 0.0032	0.0133± 0.0001	191.0±81.5	89.2±3.0	86.8±0.9	99
BN22-39-19	13.2	348.0	865.0	0.4	0.0465± 0.0021	0.0873± 0.0038	0.0137± 0.0002	20.0±103.7	85.0±3.5	87.7±1.0	96
BN22-39-20	24.6	1129.0	1428.0	0.8	0.0483± 0.0016	0.0925± 0.0034	0.0138± 0.0002	122.0±81.5	89.8±3.2	88.6±1.2	98
BNC22-59二长花岗岩
BN22-59-1	19.6	531.0	1274.0	0.4	0.0487± 0.0019	0.0923± 0.0035	0.0139± 0.0002	132.0±92.6	89.7±3.3	88.7±1.0	98
BN22-59-2	22.5	609.0	1444.0	0.4	0.0490± 0.0017	0.0940± 0.0033	0.0138± 0.0001	150.0±75.0	91.2±3.1	88.6±0.9	97
BN22-59-3	29.0	900.0	1783.0	0.5	0.0517± 0.0019	0.1024± 0.0041	0.0143± 0.0002	272.0±83.3	99.0±3.7	91.4±1.4	92
BN22-59-4	17.1	276.0	1161.0	0.2	0.0488± 0.0020	0.0927± 0.0037	0.0138± 0.0001	200.0±94.4	90.0±3.4	88.4±0.8	98
BN22-59-5	35.5	1433.0	1999.0	0.7	0.0529± 0.0018	0.1083± 0.0037	0.0149± 0.0003	324.0±105.5	104.0±3.4	95.6±1.7	91
BN22-59-6	38.9	1263.0	2466.0	0.5	0.0523± 0.0018	0.1021± 0.0035	0.0142± 0.0002	302.0±77.8	98.7±3.2	90.6±1.3	91
BN22-59-7	19.7	737.0	1217.0	0.6	0.0497± 0.0020	0.0956± 0.0039	0.0139± 0.0002	189.0±94.4	92.7±3.6	89.2±1.1	96
BN22-59-8	18.1	632.0	1132.0	0.6	0.0479± 0.0020	0.0910± 0.0036	0.0138± 0.0002	94.5±92.6	88.5±3.3	88.6±1.1	99
BN22-59-9	37.9	751.0	2554.0	0.3	0.0646± 0.0240	0.1180± 0.0413	0.0137± 0.0002	761.0±634.9	113.0±37.5	87.5±1.0	74
BN22-59-10	20.3	770.0	1239.0	0.6	0.0487± 0.0018	0.0938± 0.0035	0.0139± 0.0001	132.0±87.0	91.0±3.2	89.1±0.9	97
BN22-59-11	30.8	1556.0	1859.0	0.8	0.0466± 0.0026	0.0898± 0.0055	0.0138± 0.0002	31.6±135.2	87.3±5.1	88.3±1.3	98
BN22-59-12	16.2	444.0	1047.0	0.4	0.0508± 0.0020	0.0972± 0.0039	0.0138± 0.0002	235.0±88.9	94.2±3.6	88.1±1.0	93
BN22-59-13	13.8	378.0	907.0	0.4	0.0472± 0.0025	0.0875± 0.0046	0.0135± 0.0001	61.2±127.8	85.2±4.3	86.5±1.0	98
BN22-59-14	20.7	885.0	1278.0	0.7	0.0469± 0.0018	0.0888± 0.0034	0.0137± 0.0002	42.7±88.9	86.4±3.2	87.9±1.1	98
BN22-59-15	25.2	374.0	1784.0	0.2	0.0474± 0.0020	0.0902± 0.0037	0.0138± 0.0002	77.9±87.0	87.7±3.5	88.2±1.3	99
BN22-59-16	18.4	637.0	1146.0	0.6	0.0515± 0.0022	0.0996± 0.0050	0.0139± 0.0003	265.0±100.0	96.4±4.6	88.8±1.9	91
BN22-59-17	12.0	282.0	812.0	0.3	0.0461± 0.0021	0.0871± 0.0041	0.0136± 0.0002	400.0±290.7	84.8±3.9	87.4±1.2	96
BN22-59-18	27.3	901.0	1725.0	0.5	0.0458± 0.0047	0.0929± 0.0127	0.0137± 0.0004	323.0±100.0	90.2±11.8	87.5±2.8	96
BN22-59-19	19.5	646.0	1067.0	0.6	0.0651± 0.0024	0.1360± 0.0057	0.0149± 0.0002	776.0±79.6	129.0±5.0	95.6±1.3	69
BN22-59-20	34.5	1371.0	1856.0	0.7	0.0871± 0.0022	0.1655± 0.0042	0.0139± 0.0002	1363.0±44.3	156.0±3.7	88.7±1.4	45
BNC22-64二长花岗岩
BN22-64-1	15.9	590.0	975.0	0.6	0.0517± 0.0022	0.0971± 0.0042	0.0136± 0.0002	272.0±98.1	94.1±3.9	86.8±1.0	91
BN22-64-2	17.9	299.0	1207.0	0.3	0.0465± 0.0020	0.0874± 0.0036	0.0137± 0.0001	33.4±87.0	85.1±3.4	87.7±0.8	97
BN22-64-3	32.4	900.0	2283.0	0.4	0.0461± 0.0038	0.0838± 0.0075	0.0137± 0.0005	400.0±205.6	81.7±7.0	87.5±3.2	93
BN22-64-4	30.8	768.0	2194.0	0.4	0.0533± 0.0069	0.0959± 0.0119	0.0133± 0.0006	343.0±298.1	93.0±11.0	85.3±3.8	91
BN22-64-5	23.4	741.0	1454.0	0.5	0.0523± 0.0018	0.0987± 0.0034	0.0137± 0.0001	302.0±84.3	95.6±3.1	87.7±0.9	91
BN22-64-6	20.8	699.0	1310.0	0.5	0.0506± 0.0016	0.0948± 0.0031	0.0136± 0.0001	233.0±74.1	91.9±2.9	87.0±0.9	94
BN22-64-7	21.4	713.0	1323.0	0.5	0.0504± 0.0019	0.0955± 0.0036	0.0137± 0.0002	213.0±85.2	92.6±3.3	88.0±1.0	94
BN22-64-8	25.0	413.0	1735.0	0.2	0.0481± 0.0033	0.0902± 0.0062	0.0135± 0.0002	102.0±155.5	87.7±5.8	86.7±1.2	98
BN22-64-9	26.2	749.0	1642.0	0.5	0.0510± 0.0018	0.0970± 0.0033	0.0139± 0.0002	239.0±83.3	94.0±3.1	88.7±1.1	94
BN22-64-10	17.4	545.0	1104.0	0.5	0.0478± 0.0019	0.0892± 0.0034	0.0136± 0.0002	87.1±88.9	86.7±3.2	86.9±1.0	99
BN22-64-11	24.1	422.0	1565.0	0.3	0.0526± 0.0018	0.0999± 0.0034	0.0138± 0.0002	322.0±77.8	96.6±3.1	88.1±1.1	90
BN22-64-12	22.8	608.0	1452.0	0.4	0.0487± 0.0019	0.0918± 0.0036	0.0137± 0.0001	132.0±92.6	89.2±3.4	87.5±0.9	98
BN22-64-13	27.5	834.0	1798.0	0.5	0.0478± 0.0048	0.0841± 0.0064	0.0140± 0.0005	100.0±209.2	82.0±6.0	89.6± 2.9	91
BN22-64-14	23.3	351.0	1590.0	0.2	0.0465± 0.0019	0.0875± 0.0037	0.0136± 0.0001	33.4±83.3	85.2±3.4	86.9±0.9	97
BN22-64-15	18.7	472.0	1214.0	0.4	0.0492± 0.0033	0.0889± 0.0046	0.0137± 0.0003	167.0±138.9	86.4±4.3	87.5±1.7	98
BN22-64-16	24.7	1065.0	1454.0	0.7	0.0501± 0.0022	0.0938± 0.0039	0.0137± 0.0002	211.0±103.7	91.0±3.6	87.7± 1.0	96
BN22-64-17	21.7	354.0	1486.0	0.2	0.0486± 0.0017	0.0898± 0.0033	0.0134± 0.0001	132.0±85.2	87.3±3.1	85.7± 0.9	98
BN22-64-18	11.9	392.0	756.0	0.5	0.0517± 0.0026	0.0952± 0.0048	0.0134± 0.0002	333.0±118.5	92.4±4.5	86.0±1.	92
BN22-64-19	23.0	715.0	1472.0	0.5	0.0506± 0.0020	0.0943± 0.0037	0.0135± 0.0001	233.0±95.4	91.5±3.4	86.7±0.9	94
BN22-64-20	14.7	445.0	963.0	0.5	0.0501± 0.0023	0.0919± 0.0041	0.0134± 0.0001	198.0±99.1	89.3±3.8	85.7± 0.9	95

Fig.5 Zircon U-Pb weighted average age diagram and age concordia diagram of the Bainiuchang monzogranite

Fig.6 Classification and nomenclature diagram of the biotite monzogranite in Bainiuchang

Table 2 Major(%), trace(10-6) and rare earth element(10-6) contents of the Bainiuchang monzogranite

样品号	SiO₂	Al₂O₃		TiO₂		Fe₂O₃		FeO	CaO		MgO		MnO	K₂O		Na₂O		P₂O₅	LOI		总和
BNC22-38	73.77	12.69		0.33		0.85		0.75	1.49		0.69		0.04	5.66		2.11		0.110	1.57		100.05
BNC22-39	67.41	14.35		0.82		0.85		0.75	2.22		1.60		0.05	5.03		2.46		0.300	1.36		97.20
BNC22-46	68.28	14.85		0.53		0.88		2.23	2.83		1.17		0.05	4.90		2.59		0.240	1.26		99.81
BNC22-48	68.17	14.13		0.57		0.89		1.92	2.67		1.32		0.06	5.23		1.79		0.237	2.45		99.44
BNC22-50	68.72	11.28		0.37		0.88		2.8	2.99		1.58		0.35	5.71		0.46		0.180	4.10		99.43
BNC22-53-2	70.06	14.44		0.54		0.43		2.12	2.36		1.21		0.05	4.99		2.86		0.250	0.52		99.83
BNC22-55	70.42	14.13		0.48		0.53		1.94	2.14		0.98		0.04	5.39		2.64		0.210	0.64		99.56
BNC22-59	71.59	12.70		0.25		0.85		0.75	1.48		0.64		0.14	5.82		0.77		0.110	2.24		97.35
BNC22-60	66.27	14.19		0.54		0.72		3.16	2.69		0.9		0.17	5.88		0.54		0.250	3.71		99.01
BNC22-64	67.28	15.12		0.57		0.85		0.75	3.25		1.2		0.04	6.06		2.42		0.250	0.70		98.49
样品号	La	Ce		Pr		Nd		Sm	Eu		Gd		Tb	Dy		Ho		Er	Tm		Yb
BNC22-38	46.9	78.4		10.00		33.0		5.87	0.75		4.17		0.61	3.68		0.67		1.79	0.27		2.17
BNC22-39	69.5	117.0		14.20		47.1		7.64	1.46		5.47		0.74	4.39		0.78		2.00	0.28		2.10
BNC22-46	82.5	132.0		15.60		50.8		7.76	1.35		5.41		0.72	4.27		0.76		1.96	0.28		2.17
BNC22-48	90.5	146.0		17.50		54.0		8.28	1.41		5.67		0.71	4.08		0.75		1.79	0.26		1.94
BNC22-50	60.8	96.8		11.70		37.9		6.12	1.39		4.38		0.58	3.4		0.58		1.50	0.21		1.55
BNC22-53-2	79.1	132.0		15.80		50.4		8.18	1.29		5.84		0.78	4.63		0.83		2.09	0.31		2.27
BNC22-55	77.0	122.0		14.70		46.5		7.28	1.33		5.16		0.71	4.19		0.75		1.92	0.27		1.94
BNC22-59	44.3	71.9		8.87		29.2		5.3	0.86		3.85		0.54	3.31		0.61		1.55	0.23		1.71
BNC22-60	91.2	140.0		17.50		55.5		8.67	1.43		5.89		0.80	4.48		0.82		2.07	0.29		2.15
BNC22-64	75.8	124.0		16.00		50.2		8.52	1.44		5.66		0.77	4.39		0.82		2.01	0.29		2.21
样品号	Lu	Ta		Y		Cu		Pb	Rb		Sn		Th	U		Ta		Nb	Sr		Zn
BNC22-38	0.36	3.73		17.00		8.74		80.00	316.00		3.24		52.40	15.90		3.73		25.30	160.00		87.00
BNC22-39	0.34	2.61		20.00		10.20		34.00	285.00		3.93		33.20	7.21		2.61		29.90	268.00		58.40
BNC22-46	0.37	2.74		19.40		12.90		70.00	273.00		5.18		44.00	12.50		2.74		35.10	321.00		60.00
BNC22-48	0.32	2.06		18.40		29.30		57.20	348.00		24.60		44.60	10.50		2.06		30.30	264.00		267.6
BNC22-50	0.27	1.62		15.40		3.57		86.20	432.00		30.10		27.10	7.46		1.62		16.80	121.00		116.00
BNC22-53-2	0.38	2.69		21.20		7.16		54.70	288.00		6.66		41.10	13.60		2.69		35.90	305.00		39.60
BNC22-55	0.32	2.66		19.10		15.20		45.10	309.00		7.80		41.40	8.94		2.66		35.80	275.00		40.60
BNC22-59	0.30	1.77		15.30		402.00		44.40	388.00		63.00		32.30	10.60		1.77		20.10	109.00		289.00
BNC22-60	0.35	1.76		21.20		13.10		46.40	473.00		113.00		37.90	9.86		1.76		26.60	111.00		675.00
BNC22-64	0.36	2.76		21.00		12.50		30.00	330.00		18.90		40.10	10.80		2.76		36.30	400.00		46.20
样品号	ΣREE		LREE		HREE		LREE/HREE			δEu		δCe			La_N/Yb_N		A/CNK			分异指数(DI)
BNC22-38	188.66		174.93		13.73		12.74			0.44		0.85			15.47		1.03			88.26
BNC22-39	272.98		256.86		16.12		15.94			0.66		0.86			23.72		1.06			78.13
BNC22-46	305.99		290.05		15.94		18.19			0.61		0.84			27.31		1.01			77.96
BNC22-48	333.22		317.70		15.52		20.47			0.59		0.84			33.47		1.05			78.10
BNC22-50	227.17		214.71		12.47		17.22			0.78		0.83			28.10		0.91			75.39
BNC22-53-2	304.37		287.25		17.12		16.78			0.54		0.86			25.04		1.00			80.99
BNC22-55	284.02		268.78		15.25		17.63			0.63		0.81			28.53		1.01			82.83
BNC22-59	172.49		160.39		12.10		13.2			0.56		0.84			18.53		1.24			82.69
BNC22-60	331.30		314.45		16.85		18.67			0.58		0.81			30.40		1.17			74.84
BNC22-64	292.76		276.26		16.50		16.74			0.60		0.83			24.61		0.92			78.61

Table 2 Major(%), trace(10-6) and rare earth element(10-6) contents of the Bainiuchang monzogranite

样品号	SiO₂	Al₂O₃		TiO₂		Fe₂O₃		FeO	CaO		MgO		MnO	K₂O		Na₂O		P₂O₅	LOI		总和
BNC22-38	73.77	12.69		0.33		0.85		0.75	1.49		0.69		0.04	5.66		2.11		0.110	1.57		100.05
BNC22-39	67.41	14.35		0.82		0.85		0.75	2.22		1.60		0.05	5.03		2.46		0.300	1.36		97.20
BNC22-46	68.28	14.85		0.53		0.88		2.23	2.83		1.17		0.05	4.90		2.59		0.240	1.26		99.81
BNC22-48	68.17	14.13		0.57		0.89		1.92	2.67		1.32		0.06	5.23		1.79		0.237	2.45		99.44
BNC22-50	68.72	11.28		0.37		0.88		2.8	2.99		1.58		0.35	5.71		0.46		0.180	4.10		99.43
BNC22-53-2	70.06	14.44		0.54		0.43		2.12	2.36		1.21		0.05	4.99		2.86		0.250	0.52		99.83
BNC22-55	70.42	14.13		0.48		0.53		1.94	2.14		0.98		0.04	5.39		2.64		0.210	0.64		99.56
BNC22-59	71.59	12.70		0.25		0.85		0.75	1.48		0.64		0.14	5.82		0.77		0.110	2.24		97.35
BNC22-60	66.27	14.19		0.54		0.72		3.16	2.69		0.9		0.17	5.88		0.54		0.250	3.71		99.01
BNC22-64	67.28	15.12		0.57		0.85		0.75	3.25		1.2		0.04	6.06		2.42		0.250	0.70		98.49
样品号	La	Ce		Pr		Nd		Sm	Eu		Gd		Tb	Dy		Ho		Er	Tm		Yb
BNC22-38	46.9	78.4		10.00		33.0		5.87	0.75		4.17		0.61	3.68		0.67		1.79	0.27		2.17
BNC22-39	69.5	117.0		14.20		47.1		7.64	1.46		5.47		0.74	4.39		0.78		2.00	0.28		2.10
BNC22-46	82.5	132.0		15.60		50.8		7.76	1.35		5.41		0.72	4.27		0.76		1.96	0.28		2.17
BNC22-48	90.5	146.0		17.50		54.0		8.28	1.41		5.67		0.71	4.08		0.75		1.79	0.26		1.94
BNC22-50	60.8	96.8		11.70		37.9		6.12	1.39		4.38		0.58	3.4		0.58		1.50	0.21		1.55
BNC22-53-2	79.1	132.0		15.80		50.4		8.18	1.29		5.84		0.78	4.63		0.83		2.09	0.31		2.27
BNC22-55	77.0	122.0		14.70		46.5		7.28	1.33		5.16		0.71	4.19		0.75		1.92	0.27		1.94
BNC22-59	44.3	71.9		8.87		29.2		5.3	0.86		3.85		0.54	3.31		0.61		1.55	0.23		1.71
BNC22-60	91.2	140.0		17.50		55.5		8.67	1.43		5.89		0.80	4.48		0.82		2.07	0.29		2.15
BNC22-64	75.8	124.0		16.00		50.2		8.52	1.44		5.66		0.77	4.39		0.82		2.01	0.29		2.21
样品号	Lu	Ta		Y		Cu		Pb	Rb		Sn		Th	U		Ta		Nb	Sr		Zn
BNC22-38	0.36	3.73		17.00		8.74		80.00	316.00		3.24		52.40	15.90		3.73		25.30	160.00		87.00
BNC22-39	0.34	2.61		20.00		10.20		34.00	285.00		3.93		33.20	7.21		2.61		29.90	268.00		58.40
BNC22-46	0.37	2.74		19.40		12.90		70.00	273.00		5.18		44.00	12.50		2.74		35.10	321.00		60.00
BNC22-48	0.32	2.06		18.40		29.30		57.20	348.00		24.60		44.60	10.50		2.06		30.30	264.00		267.6
BNC22-50	0.27	1.62		15.40		3.57		86.20	432.00		30.10		27.10	7.46		1.62		16.80	121.00		116.00
BNC22-53-2	0.38	2.69		21.20		7.16		54.70	288.00		6.66		41.10	13.60		2.69		35.90	305.00		39.60
BNC22-55	0.32	2.66		19.10		15.20		45.10	309.00		7.80		41.40	8.94		2.66		35.80	275.00		40.60
BNC22-59	0.30	1.77		15.30		402.00		44.40	388.00		63.00		32.30	10.60		1.77		20.10	109.00		289.00
BNC22-60	0.35	1.76		21.20		13.10		46.40	473.00		113.00		37.90	9.86		1.76		26.60	111.00		675.00
BNC22-64	0.36	2.76		21.00		12.50		30.00	330.00		18.90		40.10	10.80		2.76		36.30	400.00		46.20
样品号	ΣREE		LREE		HREE		LREE/HREE			δEu		δCe			La_N/Yb_N		A/CNK			分异指数(DI)
BNC22-38	188.66		174.93		13.73		12.74			0.44		0.85			15.47		1.03			88.26
BNC22-39	272.98		256.86		16.12		15.94			0.66		0.86			23.72		1.06			78.13
BNC22-46	305.99		290.05		15.94		18.19			0.61		0.84			27.31		1.01			77.96
BNC22-48	333.22		317.70		15.52		20.47			0.59		0.84			33.47		1.05			78.10
BNC22-50	227.17		214.71		12.47		17.22			0.78		0.83			28.10		0.91			75.39
BNC22-53-2	304.37		287.25		17.12		16.78			0.54		0.86			25.04		1.00			80.99
BNC22-55	284.02		268.78		15.25		17.63			0.63		0.81			28.53		1.01			82.83
BNC22-59	172.49		160.39		12.10		13.2			0.56		0.84			18.53		1.24			82.69
BNC22-60	331.30		314.45		16.85		18.67			0.58		0.81			30.40		1.17			74.84
BNC22-64	292.76		276.26		16.50		16.74			0.60		0.83			24.61		0.92			78.61

Fig.7 Chondrite-normalized REE distribution patterns (a) and primitive mantle-normalized trace element spider diagrams (b) of the Bainiuchang monzogranite (normalization data from reference [26])

Table 3 Lu-Hf isotopic compositions of the Bainiuchang monzogranite

样品编号	¹⁷⁶Hf/¹⁷⁷Hf±1σ	¹⁷⁶Lu/¹⁷⁷Hf±1σ	¹⁷⁶Yb/¹⁷⁷Hf±1σ	年龄 (Ma)	ε_Hf(0)±1σ	ε_Hf(t)±1σ	T_DM1 (Ma)	T_DM2 (Ma)	f_Lu/Hf
BNC22-38-01	0.282582±0.000011	0.001122±0.000021	0.037755±0.000307	87.1	-6.6±0.6	-4.8±0.6	949	1286	-0.96
BNC22-38-02	0.282560±0.000012	0.001145±0.000025	0.038337±0.000530	90.0	-7.4±0.6	-5.5±0.6	982	1329	-0.96
BNC22-38-03	0.282596±0.000012	0.000895±0.000005	0.030512±0.000231	88.8	-6.2±0.6	-4.3±0.6	925	1259	-0.97
BNC22-38-04	0.282520±0.000012	0.000981±0.000004	0.033226±0.000322	89.3	-8.8±0.6	-6.9±0.6	1034	1407	-0.97
BNC22-38-05	0.282509±0.000011	0.000910±0.000002	0.031224±0.000379	87.2	-9.2±0.6	-7.4±0.6	1047	1430	-0.97
BNC22-38-06	0.282581±0.000011	0.000890±0.000013	0.03000±0.000126	88.5	-6.7±0.6	-4.8±0.6	945	1288	-0.97
BNC22-38-07	0.282525±0.000010	0.000834±0.000012	0.029195±0.000736	86.7	-8.7±0.6	-6.8±0.6	1023	1398	-0.97
BNC22-38-08	0.282512±0.000010	0.001003±0.000007	0.033553±0.000190	87.6	-9.1±0.6	-7.3±0.6	1046	1425	-0.96
BNC22-38-09	0.282499±0.000011	0.000964±0.000013	0.033340±0.000232	87.3	-9.6±0.6	-7.7±0.6	1063	1450	-0.97
BNC22-38-10	0.282462±0.000011	0.001070±0.000002	0.038408±0.000424	88.0	-10.9±0.6	-9.0±0.6	1118	1523	-0.96
BNC22-38-11	0.282502±0.000010	0.000803±0.000010	0.027571±0.000157	86.7	-9.5±0.6	-7.6±0.6	1054	1444	-0.97
BNC22-38-12	0.282454±0.000011	0.000866±0.000009	0.027867±0.000254	87.1	-11.2±0.6	-9.3±0.6	1123	1537	-0.97
BNC22-38-13	0.282439±0.000010	0.001014±0.000006	0.035248±0.000408	87.9	-11.7±0.6	-9.8±0.6	1148	1566	-0.96
BNC22-38-14	0.282481±0.000010	0.000518±0.000010	0.017864±0.000536	86.3	-10.2±0.6	-8.4±0.6	1075	1483	-0.98
BNC22-39-01	0.282541±0.000013	0.001167±0.000017	0.042449±0.000964	86.7	-8.2±0.7	-6.3±0.7	1010	1368	-0.96
BNC22-39-02	0.282547±0.000016	0.001182±0.000014	0.044312±0.000983	88.4	-7.9±0.8	-6.1±0.8	1002	1356	-0.96
BNC22-39-03	0.282548±0.000015	0.001053±0.000012	0.038065±0.000264	88.5	-7.9±0.7	-6.1±0.7	998	1355	-0.97
BNC22-39-04	0.282570±0.000014	0.001017±0.000004	0.036330±0.000199	87.3	-7.1±0.7	-5.3±0.7	965	1312	-0.97
BNC22-39-05	0.282528±0.000012	0.000796±0.000009	0.029936±0.000615	88.0	-8.6±0.7	-6.7±0.7	1019	1393	-0.98
BNC22-39-06	0.282534±0.000011	0.000880±0.000009	0.031676±0.000628	87.5	-8.4±0.6	-6.5±0.6	1013	1382	-0.97
BNC22-39-07	0.282550±0.000018	0.001186±0.000012	0.043169±0.000352	87.7	-7.9±0.8	-6.0±0.8	998	1352	-0.96
BNC22-39-08	0.282534±0.000011	0.000850±0.000005	0.029642±0.000205	87.1	-8.4±0.7	-6.6±0.7	1011	1382	-0.97
BNC22-39-09	0.282518±0.000013	0.000922±0.000016	0.032633±0.000832	87.3	-9.0±0.7	-7.1±0.7	1035	1413	-0.97
BNC22-39-10	0.282539±0.000012	0.001150±0.000005	0.041446±0.000144	87.1	-8.2±0.7	-6.4±0.7	1013	1373	-0.97
BNC22-39-11	0.282555±0.000014	0.001149±0.000003	0.041292±0.000219	87.6	-7.7±0.7	-5.8±0.7	991	1342	-0.97
BNC22-39-12	0.282551±0.000014	0.000921±0.000008	0.032492±0.000429	86.9	-7.8±0.7	-5.9±0.7	989	1348	-0.97
BNC22-59-01	0.282428±0.000012	0.001121±0.000006	0.036481±0.000227	88.7	-12.1±0.6	-10.2±0.6	1168	1589	-0.96
BNC22-59-02	0.282482±0.000010	0.001393±0.000002	0.048981±0.001172	91.4	-10.2±0.6	-8.3±0.6	1099	1482	-0.95
BNC22-59-03	0.282446±0.000011	0.000863±0.000005	0.029685±0.000206	88.4	-11.4±0.6	-9.6±0.6	1133	1552	-0.97
BNC22-59-04	0.282456±0.000012	0.001128±0.000010	0.038664±0.000807	90.6	-11.1±0.6	-9.2±0.6	1128	1533	-0.96
BNC22-59-05	0.282458±0.000012	0.001108±0.000007	0.037989±0.000332	89.2	-11.0±0.6	-9.1±0.6	1124	1529	-0.96
BNC22-59-06	0.282457±0.000012	0.000968±0.000006	0.033393±0.000244	88.6	-11.1±0.6	-9.2±0.6	1121	1530	-0.97
BNC22-59-07	0.282473±0.000012	0.000969±0.000005	0.032984±0.000241	89.1	-10.5±0.6	-8.6±0.6	1099	1499	-0.97
BNC22-59-08	0.282448±0.000014	0.001111±0.000004	0.03771±0.000165	88.3	-11.4±0.7	-9.5±0.7	1139	1550	-0.96
BNC22-59-09	0.282461±0.000011	0.000825±0.000002	0.027516±0.000135	88.1	-10.9±0.6	-9.0±0.6	1111	1522	-0.97
BNC22-59-10	0.282462±0.000013	0.000741±0.000008	0.024482±0.000282	86.5	-10.9±0.7	-9.0±0.7	1108	1521	-0.97
BNC22-59-11	0.282482±0.000012	0.000789±0.000009	0.026839±0.000602	87.9	-10.2±0.6	-8.3±0.6	1082	1483	-0.97
BNC22-59-12	0.282415±0.000011	0.001018±0.000007	0.033815±0.000349	88.2	-12.6±0.6	-10.7±0.6	1183	1614	-0.96
BNC22-64-01	0.282538±0.000013	0.001063±0.000003	0.033437±0.000859	86.8	-8.2±0.6	-6.4±0.7	1011	1374	-0.96
BNC22-64-02	0.282538±0.000014	0.000869±0.000003	0.026588±0.000234	87.7	-8.2±0.7	-6.3±0.7	1005	1373	-0.97
BNC22-64-03	0.282528±0.000013	0.001187±0.000002	0.042810±0.001014	87.5	-8.6±0.6	-6.7±0.6	1029	1394	-0.96
BNC22-64-04	0.282543±0.000016	0.000925±0.000002	0.030103±0.000187	87.7	-8.0±0.7	-6.2±0.7	1000	1363	-0.97
BNC22-64-05	0.282553±0.000014	0.000977±0.000004	0.031581±0.000058	87.0	-7.7±0.7	-5.8±0.7	988	1344	-0.97
BNC22-64-06	0.282535±0.000013	0.001156±0.000002	0.038150±0.000310	88.0	-8.3±0.7	-6.5±0.7	1018	1379	-0.96
BNC22-64-07	0.282523±0.000009	0.000890±0.000011	0.030219±0.000315	86.7	-8.7±0.6	-6.9±0.6	1027	1402	-0.97
BNC22-64-08	0.282515±0.000012	0.001214±0.000001	0.043321±0.000201	88.7	-9.0±0.6	-7.2±0.6	1048	1419	-0.96
BNC22-64-09	0.282556±0.000012	0.000759±0.000006	0.026551±0.000461	86.9	-7.6±0.6	-5.7±0.6	977	1337	-0.97
BNC22-64-10	0.282577±0.000012	0.000810±0.000012	0.026687±0.000344	88.1	-6.8±0.6	-4.9±0.6	949	1295	-0.97
BNC22-64-11	0.282540±0.000011	0.000871±0.000008	0.029890±0.000372	87.5	-8.1±0.6	-6.3±0.6	1003	1369	-0.97
BNC22-64-12	0.282541±0.000012	0.000973±0.000008	0.034298±0.000616	89.6	-8.1±0.6	-6.2±0.6	1004	1367	-0.97
BNC22-64-13	0.282536±0.000011	0.000960±0.000024	0.031967±0.000910	86.9	-8.3±0.6	-6.4±0.6	1011	1377	-0.97

Table 3 Lu-Hf isotopic compositions of the Bainiuchang monzogranite

样品编号	¹⁷⁶Hf/¹⁷⁷Hf±1σ	¹⁷⁶Lu/¹⁷⁷Hf±1σ	¹⁷⁶Yb/¹⁷⁷Hf±1σ	年龄 (Ma)	ε_Hf(0)±1σ	ε_Hf(t)±1σ	T_DM1 (Ma)	T_DM2 (Ma)	f_Lu/Hf
BNC22-38-01	0.282582±0.000011	0.001122±0.000021	0.037755±0.000307	87.1	-6.6±0.6	-4.8±0.6	949	1286	-0.96
BNC22-38-02	0.282560±0.000012	0.001145±0.000025	0.038337±0.000530	90.0	-7.4±0.6	-5.5±0.6	982	1329	-0.96
BNC22-38-03	0.282596±0.000012	0.000895±0.000005	0.030512±0.000231	88.8	-6.2±0.6	-4.3±0.6	925	1259	-0.97
BNC22-38-04	0.282520±0.000012	0.000981±0.000004	0.033226±0.000322	89.3	-8.8±0.6	-6.9±0.6	1034	1407	-0.97
BNC22-38-05	0.282509±0.000011	0.000910±0.000002	0.031224±0.000379	87.2	-9.2±0.6	-7.4±0.6	1047	1430	-0.97
BNC22-38-06	0.282581±0.000011	0.000890±0.000013	0.03000±0.000126	88.5	-6.7±0.6	-4.8±0.6	945	1288	-0.97
BNC22-38-07	0.282525±0.000010	0.000834±0.000012	0.029195±0.000736	86.7	-8.7±0.6	-6.8±0.6	1023	1398	-0.97
BNC22-38-08	0.282512±0.000010	0.001003±0.000007	0.033553±0.000190	87.6	-9.1±0.6	-7.3±0.6	1046	1425	-0.96
BNC22-38-09	0.282499±0.000011	0.000964±0.000013	0.033340±0.000232	87.3	-9.6±0.6	-7.7±0.6	1063	1450	-0.97
BNC22-38-10	0.282462±0.000011	0.001070±0.000002	0.038408±0.000424	88.0	-10.9±0.6	-9.0±0.6	1118	1523	-0.96
BNC22-38-11	0.282502±0.000010	0.000803±0.000010	0.027571±0.000157	86.7	-9.5±0.6	-7.6±0.6	1054	1444	-0.97
BNC22-38-12	0.282454±0.000011	0.000866±0.000009	0.027867±0.000254	87.1	-11.2±0.6	-9.3±0.6	1123	1537	-0.97
BNC22-38-13	0.282439±0.000010	0.001014±0.000006	0.035248±0.000408	87.9	-11.7±0.6	-9.8±0.6	1148	1566	-0.96
BNC22-38-14	0.282481±0.000010	0.000518±0.000010	0.017864±0.000536	86.3	-10.2±0.6	-8.4±0.6	1075	1483	-0.98
BNC22-39-01	0.282541±0.000013	0.001167±0.000017	0.042449±0.000964	86.7	-8.2±0.7	-6.3±0.7	1010	1368	-0.96
BNC22-39-02	0.282547±0.000016	0.001182±0.000014	0.044312±0.000983	88.4	-7.9±0.8	-6.1±0.8	1002	1356	-0.96
BNC22-39-03	0.282548±0.000015	0.001053±0.000012	0.038065±0.000264	88.5	-7.9±0.7	-6.1±0.7	998	1355	-0.97
BNC22-39-04	0.282570±0.000014	0.001017±0.000004	0.036330±0.000199	87.3	-7.1±0.7	-5.3±0.7	965	1312	-0.97
BNC22-39-05	0.282528±0.000012	0.000796±0.000009	0.029936±0.000615	88.0	-8.6±0.7	-6.7±0.7	1019	1393	-0.98
BNC22-39-06	0.282534±0.000011	0.000880±0.000009	0.031676±0.000628	87.5	-8.4±0.6	-6.5±0.6	1013	1382	-0.97
BNC22-39-07	0.282550±0.000018	0.001186±0.000012	0.043169±0.000352	87.7	-7.9±0.8	-6.0±0.8	998	1352	-0.96
BNC22-39-08	0.282534±0.000011	0.000850±0.000005	0.029642±0.000205	87.1	-8.4±0.7	-6.6±0.7	1011	1382	-0.97
BNC22-39-09	0.282518±0.000013	0.000922±0.000016	0.032633±0.000832	87.3	-9.0±0.7	-7.1±0.7	1035	1413	-0.97
BNC22-39-10	0.282539±0.000012	0.001150±0.000005	0.041446±0.000144	87.1	-8.2±0.7	-6.4±0.7	1013	1373	-0.97
BNC22-39-11	0.282555±0.000014	0.001149±0.000003	0.041292±0.000219	87.6	-7.7±0.7	-5.8±0.7	991	1342	-0.97
BNC22-39-12	0.282551±0.000014	0.000921±0.000008	0.032492±0.000429	86.9	-7.8±0.7	-5.9±0.7	989	1348	-0.97
BNC22-59-01	0.282428±0.000012	0.001121±0.000006	0.036481±0.000227	88.7	-12.1±0.6	-10.2±0.6	1168	1589	-0.96
BNC22-59-02	0.282482±0.000010	0.001393±0.000002	0.048981±0.001172	91.4	-10.2±0.6	-8.3±0.6	1099	1482	-0.95
BNC22-59-03	0.282446±0.000011	0.000863±0.000005	0.029685±0.000206	88.4	-11.4±0.6	-9.6±0.6	1133	1552	-0.97
BNC22-59-04	0.282456±0.000012	0.001128±0.000010	0.038664±0.000807	90.6	-11.1±0.6	-9.2±0.6	1128	1533	-0.96
BNC22-59-05	0.282458±0.000012	0.001108±0.000007	0.037989±0.000332	89.2	-11.0±0.6	-9.1±0.6	1124	1529	-0.96
BNC22-59-06	0.282457±0.000012	0.000968±0.000006	0.033393±0.000244	88.6	-11.1±0.6	-9.2±0.6	1121	1530	-0.97
BNC22-59-07	0.282473±0.000012	0.000969±0.000005	0.032984±0.000241	89.1	-10.5±0.6	-8.6±0.6	1099	1499	-0.97
BNC22-59-08	0.282448±0.000014	0.001111±0.000004	0.03771±0.000165	88.3	-11.4±0.7	-9.5±0.7	1139	1550	-0.96
BNC22-59-09	0.282461±0.000011	0.000825±0.000002	0.027516±0.000135	88.1	-10.9±0.6	-9.0±0.6	1111	1522	-0.97
BNC22-59-10	0.282462±0.000013	0.000741±0.000008	0.024482±0.000282	86.5	-10.9±0.7	-9.0±0.7	1108	1521	-0.97
BNC22-59-11	0.282482±0.000012	0.000789±0.000009	0.026839±0.000602	87.9	-10.2±0.6	-8.3±0.6	1082	1483	-0.97
BNC22-59-12	0.282415±0.000011	0.001018±0.000007	0.033815±0.000349	88.2	-12.6±0.6	-10.7±0.6	1183	1614	-0.96
BNC22-64-01	0.282538±0.000013	0.001063±0.000003	0.033437±0.000859	86.8	-8.2±0.6	-6.4±0.7	1011	1374	-0.96
BNC22-64-02	0.282538±0.000014	0.000869±0.000003	0.026588±0.000234	87.7	-8.2±0.7	-6.3±0.7	1005	1373	-0.97
BNC22-64-03	0.282528±0.000013	0.001187±0.000002	0.042810±0.001014	87.5	-8.6±0.6	-6.7±0.6	1029	1394	-0.96
BNC22-64-04	0.282543±0.000016	0.000925±0.000002	0.030103±0.000187	87.7	-8.0±0.7	-6.2±0.7	1000	1363	-0.97
BNC22-64-05	0.282553±0.000014	0.000977±0.000004	0.031581±0.000058	87.0	-7.7±0.7	-5.8±0.7	988	1344	-0.97
BNC22-64-06	0.282535±0.000013	0.001156±0.000002	0.038150±0.000310	88.0	-8.3±0.7	-6.5±0.7	1018	1379	-0.96
BNC22-64-07	0.282523±0.000009	0.000890±0.000011	0.030219±0.000315	86.7	-8.7±0.6	-6.9±0.6	1027	1402	-0.97
BNC22-64-08	0.282515±0.000012	0.001214±0.000001	0.043321±0.000201	88.7	-9.0±0.6	-7.2±0.6	1048	1419	-0.96
BNC22-64-09	0.282556±0.000012	0.000759±0.000006	0.026551±0.000461	86.9	-7.6±0.6	-5.7±0.6	977	1337	-0.97
BNC22-64-10	0.282577±0.000012	0.000810±0.000012	0.026687±0.000344	88.1	-6.8±0.6	-4.9±0.6	949	1295	-0.97
BNC22-64-11	0.282540±0.000011	0.000871±0.000008	0.029890±0.000372	87.5	-8.1±0.6	-6.3±0.6	1003	1369	-0.97
BNC22-64-12	0.282541±0.000012	0.000973±0.000008	0.034298±0.000616	89.6	-8.1±0.6	-6.2±0.6	1004	1367	-0.97
BNC22-64-13	0.282536±0.000011	0.000960±0.000024	0.031967±0.000910	86.9	-8.3±0.6	-6.4±0.6	1011	1377	-0.97

Fig.8 Statistical histogram of zircon Hf isotope compositions and model ages of the Bainiuchang monzogranite

Fig.9 Diagrams for determining the rock type of the biotite monzogranite in the Bainiuchang mining area

Fig.10 Harker diagrams of the biotite monzogranite in Bainiuchang (modified from reference [34])

Fig.11 Zircon t-εHf(t) diagram of the Bainiuchang monzo-granite (base map after Li et al.[40])

Fig.12 Tectonic setting discrimination diagrams of the Bainiuchang monzogranite

Fig.13 Metallogenic tectonic environment model of the Bainiuchang mining area (modified from reference [13])

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