华北克拉通东南缘蚌埠隆起带荆山—涂山岩体地质地球化学特征再认识

doi:10.19657/j.geoscience.1000-8527.2018.06.12

摘要/Abstract

摘要：

对位于华北克拉通东南缘蚌埠隆起带的荆山—涂山岩体进行了野外观察、年代学和地球化学研究,测得弱片麻状二长花岗岩体中U-Pb年龄为(160.4±1.3)~(162.8±1.8) Ma,为晚侏罗世岩浆活动的产物;岩石地球化学测试结果显示,岩体总体富硅、富碱,具有高钾钙碱、准铝—过铝质特征,LREE相对富集,具明显的正Eu异常,Ce异常不明显或无异常,K、P和Ti有较明显的亏损,Rb、Ba、U、La、Sr、Zr和Sm元素相对富集。成因类型判别图显示其具备I型花岗岩特征;锆石Lu-Hf同位素及全岩Sm-Nd同位素组成暗示其物质起源主要为新太古代陆壳,且岩浆源区主要为华北克拉通下地壳物质;构造环境判别图中,投影点落于火山弧花岗岩区域,暗示岩体形成于扬子克拉通沿郯庐断裂带俯冲于华北克拉通之下的构造背景,与华北克拉通晚侏罗世期间的动力学背景相一致。

关键词: 华北克拉通, 蚌埠隆起带, 荆山—涂山岩体, 地球化学特征

Abstract:

In this study, we carried out field observation, geochronological and geochemical analyses on the Jingshan-Tushan granites in the Bengbu uplift, southern margin of the North China craton. Zircon U-Pb dating of the weakly-gneissic monzogranite yielded (160.4±1.3) Ma to (162.8±1.8) Ma, suggesting Late Jurassic magmatism. Lithogeochemical data show that the Jingshan-Tushan granites are overall Si- and alkali-rich, high-K calc-alkaline, metaluminous-peraluminous, relatively LREE-enriched, with strong positive Eu anomalies and subtle Ce anomalies. The granites are also depleted in K, P and Ti, and relatively enriched in Rb, Ba, U, La, Sr, Zr and Sm. Data points of the granites fall into the I-type field in the petrogenetic discrimination diagram, and zircon Lu-Hf and whole-rock Sm-Nd compositions suggest that the magma source may have been mainly derived from the Neoarchean continental crust. In tectonic discrimination diagrams, the data points fall mainly in the volcanic arc granite field. It is suggested that the granites were formed in a post-collision extensional setting, consistent with the geodynamic background of the Late Jurassic North China craton.

Key words: North China Craton, Bengbu uplift, Jingshan-Tushan granite, lithogeochemical characteristic

中图分类号:

P588.1

康丛轩, 杨献忠, 蔡逸涛, 宗雯, 黄先觉, 孔广林, 李朝维. 华北克拉通东南缘蚌埠隆起带荆山—涂山岩体地质地球化学特征再认识[J]. 现代地质, 2018, 32(06): 1242-1253.

KANG Congxuan, YANG Xianzhong, CAI Yitao, ZONG Wen, HUANG Xianjue, KONG Guanglin, LI Chaowei. Review of Geochemical Characteristics of Jingshan-Tushan Granites in Bengbu Uplift, Southeast Margin of North China Craton[J]. Geoscience, 2018, 32(06): 1242-1253.

图/表 15

图1 蚌埠隆起带地质简图(据《安徽省东部1∶20万地质图》和宋利宏等[10]修编)

Fig.1 Geological sketch map of Bengbu uplift belt(modified after 1∶200,000 Eastern Anhui Map and Song Lihong et al.[10])

图2 荆山岩体野外露头(a)及镜下显微照片((b)斑状结构,基质为显微晶质结构)

Fig.2 Outcrop photo (a) and thin section microphotograph (b) of the Jingshan granites

图3 涂山岩体野外露头(a)及镜下显微照片((b)斑状结构,斑晶强烈泥化和绢云母化)

Fig.3 Outcrop photo (a) and thin section microphotograph (b) of the Tushan granites

表1 荆山—涂山岩体主量元素组成(wB/%)

Table 1 Major element compositions of the Jingshan-Tu shan granites(%)

样品	SiO₂	TiO₂	Al₂O₃	Fe₂O₃	FeO	MnO	MgO	CaO	Na₂O
DJS-1	73.04	0.07	14.65	0.32	0.28	0.03	1.57	0.13	3.73
DJS-2	72.63	0.10	14.55	0.44	0.46	0.03	1.26	0.17	3.92
DJS-3	72.42	0.10	14.92	0.52	0.56	0.04	1.84	0.18	3.20
DJS-4	74.92	0.09	13.94	0.20	0.68	0.06	0.14	1.41	3.71
DTS-1	72.34	0.07	15.11	0.42	0.47	0.04	1.91	0.13	3.33
DTS-2	73.49	0.07	14.17	0.30	0.29	0.02	1.26	0.06	4.22
DTS-3	73.67	0.07	13.90	0.56	0.68	0.08	0.22	1.37	4.49
DTS-4	73.35	0.08	13.94	0.48	0.83	0.03	0.43	1.52	4.25
样品	K₂O	P₂O₅	烧失量	总量	Na₂O +K₂O	K₂O/ Na₂O	σ	A/ CNK	A/ NK
DJS-1	4.74	0.02	0.80	99.38	8.47	1.27	2.39	1.27	1.30
DJS-2	4.96	0.02	0.80	99.34	8.88	1.27	2.66	1.20	1.23
DJS-3	4.92	0.02	0.62	99.34	8.12	1.54	2.24	1.37	1.41
DJS-4	3.92	0.02	0.55	99.64	7.63	1.06	1.82	1.08	1.35
DTS-1	4.87	0.02	0.71	99.42	8.20	1.46	2.29	1.38	1.41
DTS-2	4.60	0.01	0.93	99.42	8.82	1.09	2.55	1.18	1.19
DTS-3	3.90	0.03	0.47	99.44	8.39	0.87	2.30	0.99	1.20
DTS-4	4.20	0.05	0.37	99.53	8.45	0.99	2.35	0.98	1.21

图4 荆山—涂山岩体全碱-硅分类 ((a)底图据Middlemost[23])及SiO2-AR关系图((b)底图据Wright[24]) Ir.Irvine 分界线,上方为碱性,下方为亚碱性

Fig.4 Total alkali vs. silica classification diagram ((a)Base map after Middlemost[23]) and SiO2 vs. AR diagram ((b) Base map after Wright[24]) of the Jingshan-Tushan granites

图5 荆山—涂山岩体K2O-SiO2图解((a)实线据 Peccerillo等[25];虚线据 Middlemost[26])和A/CNK-A/NK图解((b)底图据Middlemost[23])

Fig.5 K2O vs. SiO2 diagram ((a)solid line after Peccerillo[25]; dotted line after Middlemost [26] ) and A/CNK vs. A/NK diagram ((b)base map after Middlemost[23]) of the Jingshan-Tushan granites

表2 荆山—涂山岩体微量元素和稀土元素组成(wB/10-6)

Table 2 Trace element and rare earth element compositions of the Jingshan-Tushan granites (10-6)

样品	Pb	Cr	Ni	Co	Rb	Sr	Ba	V	Sc	Nb	Ta	Zr	Hf
DJS-1	39.60	12.30	17.10	410.00	107.00	457.00	1 700.00	13.00	1.20	5.10	1.40	50.70	<1
DJS-2	22.40	12.50	14.60	243.00	103.00	479.00	2 090.00	16.30	1.80	7.00	1.10	51.10	<1
DJS-3	40.70	12.90	15.00	344.00	97.10	545.00	1 960.00	12.00	2.40	12.30	1.50	71.70	1.10
DJS-4	-	4.70	2.10	0.20	109.00	443.00	1 947.00	-	1.30	7.90	0.40	91.60	2.90
DTS-1	25.10	13.80	16.30	289.00	80.20	527.00	1 480.00	13.80	1.60	5.00	1.10	42.50	<1
DTS-2	26.00	12.30	19.20	466.00	116.00	331.00	1 700.00	12.40	1.70	7.90	1.40	63.40	1.20
DTS-3	-	9.20	1.60	2.60	80.00	508.00	1851.30	508.00	-	6.20	-	94.00	-
样品	U	Th	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er
DJS-1	0.67	1.80	6.20	10.70	1.30	4.80	0.94	0.65	0.87	0.14	0.87	0.19	0.65
DJS-2	1.20	1.60	6.30	10.80	1.30	4.60	0.97	0.73	0.95	0.18	1.10	0.23	0.67
DJS-3	2.40	2.10	6.70	11.60	1.40	5.10	1.00	0.70	0.88	0.11	0.50	0.08	0.21
DJS-4	0.50	2.50	7.59	11.67	1.92	5.71	1.22	0.33	1.09	0.21	1.53	0.37	1.23
DTS-1	0.71	1.60	5.40	9.50	1.20	4.10	0.83	0.55	0.82	0.14	0.95	0.20	0.61
DTS-2	0.90	2.00	5.60	10.00	1.20	4.30	0.92	0.62	0.94	0.18	1.20	0.29	0.94
DTS-3	-	1.10	8.46	15.60	1.70	6.17	1.22	0.46	0.96	0.17	1.24	0.33	0.94
样品	Tm	Yb	Lu	Y	ΣREE	LREE/HREE		(La/Yb)_N		LREE	HREE	δEu	δCe
DJS-1	0.12	0.93	0.16	6.10	28.52	6.26		4.78		24.59	3.93	2.16	0.88
DJS-2	0.11	0.72	0.11	7.20	28.77	6.07		6.28		24.70	4.07	2.30	0.88
DJS-3	0.03	0.24	0.04	2.60	28.59	12.69		20.02		26.50	2.09	2.23	0.88
DJS-4	0.23	1.63	0.28	9.61	35.01	4.33		3.34		28.44	6.57	0.86	0.73
DTS-1	0.10	0.68	0.11	6.20	25.19	5.98		5.70		21.58	3.61	2.01	0.88
DTS-2	0.18	1.30	0.22	10.00	27.89	4.31		3.09		22.64	5.25	2.02	0.90
DTS-3	0.13	0.74	0.10	7.66	38.22	7.29		8.20		33.61	4.61	1.25	0.95

图6 荆山—涂山岩体球粒陨石标准化稀土元素配分图(a)及原始地幔标准化微量元素蛛网图(b)(标准化数值据Sun等[27])

Fig.6 Chondrite-normalized REE pattern(a) and primitive mantle-normalized spider diagram(b) of the Jingshan-Tushan granites (normalizing values after Sun et al.[27])

表3 荆山—涂山岩体锆石LA-ICP-MS U-Pb年龄数据

Table 3 LA-ICP-MS zircon U-Pb data of the Jingshan-Tushan granites

样品号	Th/10^-6	U/10^-6	Th/U	同位素比值								年龄/Ma
样品号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
DJS-1-1	223	2 610	0.09	0.049 3	0.000 8	0.169 4	0.003 1	0.024 9	0.000 2	0.007 9	0.000 2	162.2	40.0	158.9	2.9	158.7	1.6
DJS-1-3	150	811	0.18	0.054 6	0.001 1	0.193 0	0.004 0	0.025 6	0.000 3	0.009 1	0.000 2	394.4	44.3	179.2	3.7	163.3	1.7
DJS-1-4	601	3 506	0.17	0.056 2	0.000 8	0.198 3	0.003 0	0.025 6	0.000 3	0.009 5	0.000 2	460.2	30.8	183.7	2.7	162.9	1.7
DJS-1-5	1 764	8 774	0.20	0.082 3	0.001 2	0.290 7	0.004 3	0.025 6	0.000 3	0.010 0	0.000 2	1 253.6	27.5	259.1	3.9	163.0	1.6
DJS-1-6	699	4 464	0.16	0.058 3	0.000 8	0.202 7	0.003 0	0.025 2	0.000 3	0.009 5	0.000 2	539.8	29.8	187.4	2.8	160.6	1.6
DJS-1-7	589	3 620	0.16	0.082 8	0.001 4	0.294 4	0.005 0	0.025 8	0.000 3	0.010 0	0.000 2	1 265.4	33.9	262.0	4.5	164.1	1.7
DJS-1-8	552	4 452	0.12	0.060 4	0.000 9	0.216 9	0.003 3	0.026 1	0.000 3	0.010 9	0.000 2	616.7	30.5	199.3	3.0	165.8	1.7
DJS-1-9	283	2 219	0.13	0.078 6	0.001 1	0.283 2	0.004 5	0.026 1	0.000 3	0.010 0	0.000 2	1 162.3	27.8	253.2	4.1	166.3	1.7
DJS-1-10	314	2 085	0.15	0.061 0	0.000 9	0.217 4	0.004 1	0.025 8	0.000 3	0.010 1	0.000 3	640.3	33.4	199.8	3.8	164.5	1.8
DJS-1-11	1 273	5 593	0.23	0.050 6	0.000 7	0.182 1	0.002 8	0.026 1	0.000 3	0.006 9	0.000 1	221.2	31.1	169.8	2.6	166.2	1.7
DJS-1-12	435	2 134	0.20	0.050 4	0.000 8	0.178 4	0.003 1	0.025 7	0.000 3	0.006 5	0.000 1	212.5	36.6	166.7	2.9	163.4	2.0
DJS-1-13	53	786	0.07	0.061 9	0.001 9	0.219 6	0.007 2	0.025 7	0.000 3	0.016 7	0.000 9	671.7	67.2	201.6	6.6	163.7	2.2
DJS-1-14	34	415	0.08	0.048 8	0.001 3	0.242 6	0.006 8	0.036 1	0.000 4	0.010 8	0.000 5	136.3	62.4	220.6	6.1	228.6	2.4
DJS-1-15	21	115	0.19	0.056 5	0.009 1	0.205 9	0.033 8	0.026 4	0.000 4	0.009 7	0.001 2	472.3	357.7	190.1	31.2	168.1	2.6
DJS-1-16	264	2 288	0.12	0.054 4	0.000 8	0.194 0	0.003 3	0.025 9	0.000 3	0.009 6	0.000 2	388.8	32.1	180.0	3.1	164.5	1.9
DJS-1-17	108	1 145	0.09	0.055 2	0.001 1	0.193 9	0.004 0	0.025 5	0.000 3	0.012 1	0.000 5	419.8	44.1	180.0	3.7	162.2	1.6
DTS-1-2	70	738	0.10	0.065 5	0.001 6	0.226 8	0.005 7	0.025 1	0.000 4	0.013 7	0.000 6	790.6	50.2	207.5	5.2	159.9	2.3
DTS-1-3	384	2 271	0.17	0.057 3	0.000 9	0.197 1	0.003 6	0.025 0	0.000 4	0.009 8	0.000 2	501.3	36.4	182.6	3.4	158.9	2.3
DTS-1-4	47	533	0.09	0.074 3	0.002 5	0.263 8	0.009 4	0.025 8	0.000 4	0.020 0	0.001 0	1 049.0	68.2	237.7	8.5	163.9	2.4
DTS-1-5	180	1 858	0.10	0.048 9	0.000 9	0.174 0	0.003 4	0.025 8	0.000 4	0.007 9	0.000 2	145.1	40.9	162.9	3.2	164.1	2.4
DTS-1-7	632	2 375	0.27	0.053 9	0.000 9	0.186 9	0.003 4	0.025 1	0.000 4	0.008 0	0.000 2	367.2	35.9	173.9	3.1	160.1	2.3
DTS-1-8	89	931	0.10	0.057 7	0.001 5	0.201 9	0.005 2	0.025 4	0.000 4	0.013 1	0.000 7	519.6	56.1	186.7	4.8	161.4	2.4
DTS-1-9	468	3 785	0.12	0.067 6	0.001 0	0.237 4	0.004 1	0.025 5	0.000 4	0.013 8	0.000 4	856.7	31.4	216.3	3.8	162.1	2.3
DTS-1-10	25	184	0.14	0.068 6	0.003 6	0.246 8	0.013 2	0.026 1	0.000 4	0.015 2	0.000 9	887.8	107.2	224.0	12.0	166.0	2.5
DTS-1-11	86	869	0.10	0.061 7	0.001 4	0.216 8	0.005 0	0.025 5	0.000 4	0.012 9	0.000 6	664.0	47.6	199.2	4.6	162.2	2.4
DTS-1-12	93	1 226	0.08	0.106 9	0.002 5	0.383 1	0.008 9	0.026 0	0.000 4	0.047 3	0.002 3	1 747.8	43.1	329.3	7.7	165.4	2.4
DTS-1-13	54	519	0.10	0.097 5	0.002 9	0.351 8	0.011 1	0.026 2	0.000 4	0.030 0	0.001 8	1 576.6	55.2	306.1	9.7	166.6	2.4
DTS-1-14	73	996	0.07	0.051 3	0.001 2	0.186 7	0.004 6	0.026 4	0.000 4	0.010 2	0.000 6	252.3	53.5	173.8	4.3	168.1	2.8
DTS-1-15	122	869	0.14	0.061 6	0.001 6	0.222 5	0.005 8	0.026 2	0.000 4	0.012 3	0.000 9	661.0	54.1	204.0	5.3	166.7	2.4
DTS-1-16	40	326	0.12	0.075 9	0.003 3	0.273 5	0.012 5	0.026 1	0.000 4	0.017 9	0.001 5	1 093.1	88.0	245.5	11.2	166.3	2.4
DTS-1-17	22	328	0.07	0.065 5	0.002 7	0.235 3	0.009 9	0.026 1	0.000 4	0.027 5	0.002 0	789.4	86.1	214.6	9.1	165.9	2.4
DTS-1-18	18	237	0.08	0.062 9	0.002 4	0.225 9	0.009 2	0.026 1	0.000 4	0.014 0	0.000 9	704.7	81.5	206.8	8.4	165.8	2.5
DTS-1-21	21	251	0.09	0.073 7	0.003 4	0.265 8	0.012 5	0.026 2	0.000 4	0.027 1	0.001 6	1 032.6	92.1	239.3	11.3	166.5	2.4
DTS-1-22	19	246	0.08	0.094 6	0.004 5	0.332 7	0.017 0	0.025 5	0.000 4	0.039 9	0.002 5	1 520.2	89.6	291.6	14.9	162.4	2.5
DTS-1-23	76	713	0.11	0.063 8	0.002 0	0.218 9	0.007 1	0.024 9	0.000 4	0.015 7	0.000 8	736.2	65.2	201.0	6.5	158.4	2.3

表3 荆山—涂山岩体锆石LA-ICP-MS U-Pb年龄数据

Table 3 LA-ICP-MS zircon U-Pb data of the Jingshan-Tushan granites

样品号	Th/10^-6	U/10^-6	Th/U	同位素比值								年龄/Ma
样品号	Th/10^-6	U/10^-6	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
DJS-1-1	223	2 610	0.09	0.049 3	0.000 8	0.169 4	0.003 1	0.024 9	0.000 2	0.007 9	0.000 2	162.2	40.0	158.9	2.9	158.7	1.6
DJS-1-3	150	811	0.18	0.054 6	0.001 1	0.193 0	0.004 0	0.025 6	0.000 3	0.009 1	0.000 2	394.4	44.3	179.2	3.7	163.3	1.7
DJS-1-4	601	3 506	0.17	0.056 2	0.000 8	0.198 3	0.003 0	0.025 6	0.000 3	0.009 5	0.000 2	460.2	30.8	183.7	2.7	162.9	1.7
DJS-1-5	1 764	8 774	0.20	0.082 3	0.001 2	0.290 7	0.004 3	0.025 6	0.000 3	0.010 0	0.000 2	1 253.6	27.5	259.1	3.9	163.0	1.6
DJS-1-6	699	4 464	0.16	0.058 3	0.000 8	0.202 7	0.003 0	0.025 2	0.000 3	0.009 5	0.000 2	539.8	29.8	187.4	2.8	160.6	1.6
DJS-1-7	589	3 620	0.16	0.082 8	0.001 4	0.294 4	0.005 0	0.025 8	0.000 3	0.010 0	0.000 2	1 265.4	33.9	262.0	4.5	164.1	1.7
DJS-1-8	552	4 452	0.12	0.060 4	0.000 9	0.216 9	0.003 3	0.026 1	0.000 3	0.010 9	0.000 2	616.7	30.5	199.3	3.0	165.8	1.7
DJS-1-9	283	2 219	0.13	0.078 6	0.001 1	0.283 2	0.004 5	0.026 1	0.000 3	0.010 0	0.000 2	1 162.3	27.8	253.2	4.1	166.3	1.7
DJS-1-10	314	2 085	0.15	0.061 0	0.000 9	0.217 4	0.004 1	0.025 8	0.000 3	0.010 1	0.000 3	640.3	33.4	199.8	3.8	164.5	1.8
DJS-1-11	1 273	5 593	0.23	0.050 6	0.000 7	0.182 1	0.002 8	0.026 1	0.000 3	0.006 9	0.000 1	221.2	31.1	169.8	2.6	166.2	1.7
DJS-1-12	435	2 134	0.20	0.050 4	0.000 8	0.178 4	0.003 1	0.025 7	0.000 3	0.006 5	0.000 1	212.5	36.6	166.7	2.9	163.4	2.0
DJS-1-13	53	786	0.07	0.061 9	0.001 9	0.219 6	0.007 2	0.025 7	0.000 3	0.016 7	0.000 9	671.7	67.2	201.6	6.6	163.7	2.2
DJS-1-14	34	415	0.08	0.048 8	0.001 3	0.242 6	0.006 8	0.036 1	0.000 4	0.010 8	0.000 5	136.3	62.4	220.6	6.1	228.6	2.4
DJS-1-15	21	115	0.19	0.056 5	0.009 1	0.205 9	0.033 8	0.026 4	0.000 4	0.009 7	0.001 2	472.3	357.7	190.1	31.2	168.1	2.6
DJS-1-16	264	2 288	0.12	0.054 4	0.000 8	0.194 0	0.003 3	0.025 9	0.000 3	0.009 6	0.000 2	388.8	32.1	180.0	3.1	164.5	1.9
DJS-1-17	108	1 145	0.09	0.055 2	0.001 1	0.193 9	0.004 0	0.025 5	0.000 3	0.012 1	0.000 5	419.8	44.1	180.0	3.7	162.2	1.6
DTS-1-2	70	738	0.10	0.065 5	0.001 6	0.226 8	0.005 7	0.025 1	0.000 4	0.013 7	0.000 6	790.6	50.2	207.5	5.2	159.9	2.3
DTS-1-3	384	2 271	0.17	0.057 3	0.000 9	0.197 1	0.003 6	0.025 0	0.000 4	0.009 8	0.000 2	501.3	36.4	182.6	3.4	158.9	2.3
DTS-1-4	47	533	0.09	0.074 3	0.002 5	0.263 8	0.009 4	0.025 8	0.000 4	0.020 0	0.001 0	1 049.0	68.2	237.7	8.5	163.9	2.4
DTS-1-5	180	1 858	0.10	0.048 9	0.000 9	0.174 0	0.003 4	0.025 8	0.000 4	0.007 9	0.000 2	145.1	40.9	162.9	3.2	164.1	2.4
DTS-1-7	632	2 375	0.27	0.053 9	0.000 9	0.186 9	0.003 4	0.025 1	0.000 4	0.008 0	0.000 2	367.2	35.9	173.9	3.1	160.1	2.3
DTS-1-8	89	931	0.10	0.057 7	0.001 5	0.201 9	0.005 2	0.025 4	0.000 4	0.013 1	0.000 7	519.6	56.1	186.7	4.8	161.4	2.4
DTS-1-9	468	3 785	0.12	0.067 6	0.001 0	0.237 4	0.004 1	0.025 5	0.000 4	0.013 8	0.000 4	856.7	31.4	216.3	3.8	162.1	2.3
DTS-1-10	25	184	0.14	0.068 6	0.003 6	0.246 8	0.013 2	0.026 1	0.000 4	0.015 2	0.000 9	887.8	107.2	224.0	12.0	166.0	2.5
DTS-1-11	86	869	0.10	0.061 7	0.001 4	0.216 8	0.005 0	0.025 5	0.000 4	0.012 9	0.000 6	664.0	47.6	199.2	4.6	162.2	2.4
DTS-1-12	93	1 226	0.08	0.106 9	0.002 5	0.383 1	0.008 9	0.026 0	0.000 4	0.047 3	0.002 3	1 747.8	43.1	329.3	7.7	165.4	2.4
DTS-1-13	54	519	0.10	0.097 5	0.002 9	0.351 8	0.011 1	0.026 2	0.000 4	0.030 0	0.001 8	1 576.6	55.2	306.1	9.7	166.6	2.4
DTS-1-14	73	996	0.07	0.051 3	0.001 2	0.186 7	0.004 6	0.026 4	0.000 4	0.010 2	0.000 6	252.3	53.5	173.8	4.3	168.1	2.8
DTS-1-15	122	869	0.14	0.061 6	0.001 6	0.222 5	0.005 8	0.026 2	0.000 4	0.012 3	0.000 9	661.0	54.1	204.0	5.3	166.7	2.4
DTS-1-16	40	326	0.12	0.075 9	0.003 3	0.273 5	0.012 5	0.026 1	0.000 4	0.017 9	0.001 5	1 093.1	88.0	245.5	11.2	166.3	2.4
DTS-1-17	22	328	0.07	0.065 5	0.002 7	0.235 3	0.009 9	0.026 1	0.000 4	0.027 5	0.002 0	789.4	86.1	214.6	9.1	165.9	2.4
DTS-1-18	18	237	0.08	0.062 9	0.002 4	0.225 9	0.009 2	0.026 1	0.000 4	0.014 0	0.000 9	704.7	81.5	206.8	8.4	165.8	2.5
DTS-1-21	21	251	0.09	0.073 7	0.003 4	0.265 8	0.012 5	0.026 2	0.000 4	0.027 1	0.001 6	1 032.6	92.1	239.3	11.3	166.5	2.4
DTS-1-22	19	246	0.08	0.094 6	0.004 5	0.332 7	0.017 0	0.025 5	0.000 4	0.039 9	0.002 5	1 520.2	89.6	291.6	14.9	162.4	2.5
DTS-1-23	76	713	0.11	0.063 8	0.002 0	0.218 9	0.007 1	0.024 9	0.000 4	0.015 7	0.000 8	736.2	65.2	201.0	6.5	158.4	2.3

图7 荆山—涂山岩体锆石LA-ICP-MS U-Pb年龄谐和图

Fig.7 LA-ICP-MS zircon U-Pb age concordia diagrams for the Jingshan-Tushan granites

表4 荆山岩体Lu-Hf同位素测试结果

Table 4 Zircon Lu-Hf isotopic compositions of the Jingshan granites

样号	t/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	T_DM	$T D M 2$	f_Lu-Hf
DJS-1-1	159	0.071 140	0.002 629	0.282 084	0.000 016	-24.34	-21.14	1 718	2 542	-0.92
DJS-1-2	1 724	0.079 330	0.003 112	0.282 281	0.000 022	-17.36	17.51	1 451	1 312	-0.91
DJS-1-3	163	0.065 974	0.002 473	0.282 260	0.000 019	-18.12	-14.81	1 457	2 150	-0.93
DJS-1-4	163	0.023 143	0.000 917	0.282 358	0.000 020	-14.64	-11.18	1 260	1 920	-0.97
DJS-1-5	163	0.077 667	0.002 859	0.282 204	0.000 024	-20.10	-16.83	1 554	2 276	-0.91
DJS-1-6	161	0.086 668	0.003 337	0.282 257	0.000 023	-18.22	-15.05	1 496	2 162	-0.9
DJS-1-7	164	0.049 394	0.001 493	0.282 154	0.000 022	-21.86	-18.44	1 568	2 378	-0.96
DJS-1-8	166	0.066 884	0.002 472	0.282 221	0.000 023	-19.48	-16.13	1 512	2 233	-0.93
DJS-1-9	166	0.083 528	0.002 965	0.282 166	0.000 022	-21.43	-18.11	1 614	2 359	-0.91
DJS-1-10	164	0.010 036	0.000 358	0.282 139	0.000 015	-22.38	-18.82	1 542	2 404	-0.99
DJS-1-11	166	0.055 563	0.002 150	0.282 162	0.000 016	-21.57	-18.18	1 584	2 363	-0.94
DJS-1-12	163	0.066 689	0.002 496	0.282 269	0.000 019	-17.78	-14.45	1 444	2 128	-0.92
DJS-1-13	164	0.111 115	0.003 713	0.282 189	0.000 024	-20.61	-17.42	1 613	2 312	-0.89
DJS-1-14	229	0.096 219	0.003 130	0.282 276	0.000 027	-17.54	-12.99	1 459	2 083	-0.91
DJS-1-15	168	0.035 265	0.001 136	0.282 138	0.000 021	-22.42	-18.88	1 575	2 409	-0.97
DJS-1-16	165	0.029 932	0.000 930	0.282 179	0.000 018	-20.98	-17.47	1 510	2 319	-0.97
DJS-1-17	162	0.120 376	0.004 043	0.282 335	0.000 028	-15.47	-12.36	1 408	1 991	-0.88

表4 荆山岩体Lu-Hf同位素测试结果

Table 4 Zircon Lu-Hf isotopic compositions of the Jingshan granites

样号	t/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	T_DM	$T D M 2$	f_Lu-Hf
DJS-1-1	159	0.071 140	0.002 629	0.282 084	0.000 016	-24.34	-21.14	1 718	2 542	-0.92
DJS-1-2	1 724	0.079 330	0.003 112	0.282 281	0.000 022	-17.36	17.51	1 451	1 312	-0.91
DJS-1-3	163	0.065 974	0.002 473	0.282 260	0.000 019	-18.12	-14.81	1 457	2 150	-0.93
DJS-1-4	163	0.023 143	0.000 917	0.282 358	0.000 020	-14.64	-11.18	1 260	1 920	-0.97
DJS-1-5	163	0.077 667	0.002 859	0.282 204	0.000 024	-20.10	-16.83	1 554	2 276	-0.91
DJS-1-6	161	0.086 668	0.003 337	0.282 257	0.000 023	-18.22	-15.05	1 496	2 162	-0.9
DJS-1-7	164	0.049 394	0.001 493	0.282 154	0.000 022	-21.86	-18.44	1 568	2 378	-0.96
DJS-1-8	166	0.066 884	0.002 472	0.282 221	0.000 023	-19.48	-16.13	1 512	2 233	-0.93
DJS-1-9	166	0.083 528	0.002 965	0.282 166	0.000 022	-21.43	-18.11	1 614	2 359	-0.91
DJS-1-10	164	0.010 036	0.000 358	0.282 139	0.000 015	-22.38	-18.82	1 542	2 404	-0.99
DJS-1-11	166	0.055 563	0.002 150	0.282 162	0.000 016	-21.57	-18.18	1 584	2 363	-0.94
DJS-1-12	163	0.066 689	0.002 496	0.282 269	0.000 019	-17.78	-14.45	1 444	2 128	-0.92
DJS-1-13	164	0.111 115	0.003 713	0.282 189	0.000 024	-20.61	-17.42	1 613	2 312	-0.89
DJS-1-14	229	0.096 219	0.003 130	0.282 276	0.000 027	-17.54	-12.99	1 459	2 083	-0.91
DJS-1-15	168	0.035 265	0.001 136	0.282 138	0.000 021	-22.42	-18.88	1 575	2 409	-0.97
DJS-1-16	165	0.029 932	0.000 930	0.282 179	0.000 018	-20.98	-17.47	1 510	2 319	-0.97
DJS-1-17	162	0.120 376	0.004 043	0.282 335	0.000 028	-15.47	-12.36	1 408	1 991	-0.88

表5 荆山—涂山岩体Sm-Nd同位素组成

Table 5 Sm-Nd isotopic compositions of the Jingshan-Tushan granites

样号	Sm/10^-6	Nd/10^-6	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	(¹⁴³Nd/¹⁴⁴Nd)_i	T_DM/Ma	T_DM2/Ma	ε_Nd(0)	ε_Nd(t)	$f S m / N d$
DJS-1	0.95	5.07	0.113 20	0.511 72	0.511 599	2 164	2 264	-17.91	-16.18	-0.42
DJS-2	1.05	5.28	0.123 90	0.511 71	0.511 584	2 430	2 290	-18.02	-16.55	-0.37
DTS-1	0.76	3.72	0.120 30	0.511 70	0.511 571	2 361	2 308	-18.32	-16.73	-0.39

表5 荆山—涂山岩体Sm-Nd同位素组成

Table 5 Sm-Nd isotopic compositions of the Jingshan-Tushan granites

样号	Sm/10^-6	Nd/10^-6	¹⁴⁷Sm/¹⁴⁴Nd	¹⁴³Nd/¹⁴⁴Nd	(¹⁴³Nd/¹⁴⁴Nd)_i	T_DM/Ma	T_DM2/Ma	ε_Nd(0)	ε_Nd(t)	$f S m / N d$
DJS-1	0.95	5.07	0.113 20	0.511 72	0.511 599	2 164	2 264	-17.91	-16.18	-0.42
DJS-2	1.05	5.28	0.123 90	0.511 71	0.511 584	2 430	2 290	-18.02	-16.55	-0.37
DTS-1	0.76	3.72	0.120 30	0.511 70	0.511 571	2 361	2 308	-18.32	-16.73	-0.39

图8 荆山岩体t-εHf(t)相关图解

Fig.8 Temperature vs. εHf(t) diagram of the Jingshan granites

图9 荆山—涂山岩体成因类型判别图(底图据Collin等[37])

Fig.9 Petrogenetic discrimination diagrams of Jingshan-Tushan granites (base map after Collins et al.[37])

图10 荆山—涂山岩体(Y+Nb)-Rb及(Yb+Ta)-Rb构造环境判别图解(底图据Pearce等[43]) WPG.板内花岗岩; ORG.大洋脊花岗岩; VAG.火山弧花岗岩; syn-COLG.同碰撞花岗岩

Fig.10 Tectonic discrimination diagrams of (Y+Nb) vs. Rb (a) and (Yb+Ta) vs.Rb (b) for the Jingshan-Tushan granites(base map after Pearce et al.[43])

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