Geochronology, Petrogenesis and Geological Significance of the Puquan Granite Pluton in Dayaoshan Area, Guangxi

doi:10.19657/j.geoscience.1000-8527.2020.046

Abstract

Abstract:

Caledonian magmatic rocks are widespread in the Dayaoshan uplift zone in Guangxi Province, and research on them has instructional significance for understanding the geodynamic setting, evolution mechanism and prospecting work of Dayaoshan uplift. This paper present the first detailed geochronological, elemental and Hf isotope study on the Puquan intrusion in the northwestern uplift zone. LA-ICP-MS zircon U-Pb dating on the Puquan intrusion yielded Late Ordovician age of (441.1±1.2) Ma (MSWD=0.14). The intrusion comprises medium-fine-grained I-type granite, and is characterized by high SiO₂ (68.50%-72.83%) and medium Al₂O₃ (13.66%-14.42%) contents and medium alkalinity (total alkali=7.17%-8.34%, K₂O/Na₂O=0.75-1.33) with A/CNK=0.89-1.18, suggesting its metaluminous to weakly peraluminous nature. The rocks are enriched in LILEs (such as Rb, Th, U, and Pb) and depleted in Ba, Sr, Nb, and Ti. The total REE contents are 97.41×10^-6-178.80×10^-6, and the rocks have distinctly negative Eu anomalies (δEu=0.12-0.14). The magmatic zircon ε_Hf(t) values are mostly negative (-14.92 to 2.75), with an average of -2.67. In the ε_Hf(t) vs. age and the (¹⁷⁶Lu/¹⁷⁷Hf) vs. age diagrams, the samples fall below the chondrite evolution line, and the two-stage model ages ( $t D M 2$ ) are of 1.2 Ga to 2.4 Ga (average 1.6 Ga), indicating that the rocks may have derived from partial melting of the Mesoproterozoic crustal material with possible mantle-derived components. This shows that the Puquan intrusion was formed under syn-collisional compression between the Yangtze and Cathaysia Plate.

Key words: Puquan granitic pluton, LA-ICP-MS zircon U-Pb dating, Hf isotope, Caledonian, Dayaoshan (Guangxi)

CLC Number:

CHEN Huan, KANG Zhiqiang, WU Jiachang, LI Daixian, CAO Yan, WEI Tianwei, WEI Naishao, LIU Di, ZHOU Tong, LIU Dongmei, LAN Haiyang. Geochronology, Petrogenesis and Geological Significance of the Puquan Granite Pluton in Dayaoshan Area, Guangxi[J]. Geoscience, 2020, 34(06): 1277-1290.

Figures/Tables 17

Fig.1 Distribution of granitoids in Dayaoshan area, Guangxi (base map modified from reference [3])

Fig.2 Simplified geologic map of the Puquan granitic pluton (modified from 1∶200,000 geologic map)

Fig.3 Field outcrop (a), hand specimen (b) and microscopic photographs (c-d) of medium-fine-grained granite

Table 1 LA-(MC)-ICP-MS zircon U-Pb analysis results of Puquan granitic pluton

测点	w_B/10^-6		Th/U	同位素比值		年龄/Ma
测点	U	Th	Th/U	²⁰⁷Pb/²³⁵U ±σ	²⁰⁶Pb/²³⁸U±σ	²⁰⁷Pb/²³⁵U±σ	²⁰⁶Pb/²³⁸U±σ
14PQ-06-1	488	82	0.17	0.547 4±0.002 2	0.070 8± 0.000 3	443±1.4	441±1.6
14PQ-06-2	551	58	0.10	0.562 9±0.002 1	0.070 8± 0.000 3	453±1.4	441±1.7
14PQ-06-3	518	69	0.13	0.553 9±0.004 3	0.070 8± 0.000 4	448±2.8	441±2.4
14PQ-06-4	503	81	0.16	0.555 5±0.001 6	0.070 7± 0.000 1	449±1.1	440±0.5
14PQ-06-5	570	62	0.11	0.540 1±0.003 0	0.070 7± 0.000 4	438±2.0	441±2.3
14PQ-06-6	523	76	0.15	0.547 7±0.001 5	0.070 9± 0.000 2	444±1.0	441±1.1
14PQ-06-7	480	89	0.19	0.572 3±0.003 4	0.070 7± 0.000 4	460±2.2	440±2.7
14PQ-06-8	295	162	0.55	0.572 2±0.001 7	0.070 7± 0.000 2	459±1.1	440±1.1
14PQ-06-9	444	97	0.22	0.575 0±0.002 4	0.070 8± 0.000 3	461±1.5	441±1.9
14PQ-06-10	481	81	0.17	0.569 5±0.003 9	0.070 8± 0.000 5	458±2.5	441±3.2
14PQ-06-11	558	69	0.12	0.546 6±0.002 3	0.070 9± 0.000 3	443±1.5	441±1.7
14PQ-06-12	422	113	0.27	0.550 1±0.002 6	0.070 9± 0.000 3	445±1.7	442±1.8
14PQ-06-13	571	57	0.10	0.563 5±0.001 7	0.070 9± 0.000 2	454±1.1	441±1.0
14PQ-06-14	354	131	0.37	0.552 5±0.002 4	0.070 9± 0.000 3	447±1.6	441±1.6
14PQ-06-15	428	107	0.25	0.561 7±0.002 5	0.070 9± 0.000 3	453±1.6	442±1.8
14PQ-06-16	455	102	0.22	0.554 0±0.003 8	0.070 9± 0.000 5	448±2.5	442±2.9
14PQ-06-17	439	107	0.24	0.573 7±0.001 2	0.070 8± 0.000 1	460±0.8	441±0.7
14PQ-06-18	326	146	0.45	0.561 9±0.002 8	0.070 8± 0.000 2	453±1.8	441±1.5

Fig.4 Zircon CL image (a) and U-Pb concordant diagram (b) of the Puquan granitic pluton

Table 2 Major (%), trace element (10-6), and REE (10-6) contents of the Puquan granitic pluton

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	K₂O/ Na₂O	A/NK	A/CNK
14PQ-06-2	72.83	0.18	13.66	2.69	0.14	0.63	0.28	3.58	4.77	0.04	0.94	99.73	1.33	1.24	1.18
14PQ-06-3	70.08	0.33	14.28	3.78	0.16	1.07	2.10	3.32	3.85	0.10	0.93	100.00	1.16	1.48	1.06
14PQ-06-5	69.75	0.34	14.42	3.50	0.09	1.08	2.58	3.55	3.65	0.10	1.16	100.22	1.03	1.47	1.00
14PQ-06-6	68.50	0.33	14.12	3.63	0.13	1.01	2.45	4.64	3.49	0.10	1.06	99.46	0.75	1.24	0.89
样品编号	Rb	Ba	Th	U	Nb	Ta	Pb	Sr	Zr	Hf	Ti	Y	La	Ce	Pr
14PQ-06-2	324.00	272.00	31.99	14.12	13.00	2.14	35.34	54.82	95.48	3.46	1 039.00	23.67	79.87	62.22	49.37
14PQ-06-3	255.00	360.00	32.14	15.42	16.22	2.29	66.87	113.00	159.00	4.83	1 897.00	30.99	149.00	116.00	91.05
14PQ-06-5	236.00	362.00	30.89	12.61	15.74	2.02	39.35	120.00	173.00	5.04	2 014.00	28.43	157.00	122.00	93.89
14PQ-06-6	238.00	322.00	30.65	14.38	16.66	2.71	40.87	111.00	172.00	5.22	1 952.00	33.36	149.00	117.00	90.53
样品编号	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	LREE	HREE	REE	δEu
14PQ-06-2	36.36	25.10	8.79	17.13	17.38	14.92	14.13	14.32	14.51	14.53	16.14	83.03	14.38	97.41	0.14
14PQ-06-3	67.19	42.48	12.07	27.30	25.13	20.47	18.73	17.70	16.86	16.41	17.72	154.00	19.41	173.00	0.12
14PQ-06-5	68.46	41.96	12.76	26.67	23.80	19.09	17.31	16.25	15.69	14.82	16.14	160.00	18.21	178.00	0.12
14PQ-06-6	67.19	42.29	12.93	28.13	25.94	20.98	19.43	18.61	18.43	18.06	19.69	154.00	20.29	174.00	0.12

Table 2 Major (%), trace element (10-6), and REE (10-6) contents of the Puquan granitic pluton

样品编号	SiO₂	TiO₂	Al₂O₃	Fe₂ $O 3 T$	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	K₂O/ Na₂O	A/NK	A/CNK
14PQ-06-2	72.83	0.18	13.66	2.69	0.14	0.63	0.28	3.58	4.77	0.04	0.94	99.73	1.33	1.24	1.18
14PQ-06-3	70.08	0.33	14.28	3.78	0.16	1.07	2.10	3.32	3.85	0.10	0.93	100.00	1.16	1.48	1.06
14PQ-06-5	69.75	0.34	14.42	3.50	0.09	1.08	2.58	3.55	3.65	0.10	1.16	100.22	1.03	1.47	1.00
14PQ-06-6	68.50	0.33	14.12	3.63	0.13	1.01	2.45	4.64	3.49	0.10	1.06	99.46	0.75	1.24	0.89
样品编号	Rb	Ba	Th	U	Nb	Ta	Pb	Sr	Zr	Hf	Ti	Y	La	Ce	Pr
14PQ-06-2	324.00	272.00	31.99	14.12	13.00	2.14	35.34	54.82	95.48	3.46	1 039.00	23.67	79.87	62.22	49.37
14PQ-06-3	255.00	360.00	32.14	15.42	16.22	2.29	66.87	113.00	159.00	4.83	1 897.00	30.99	149.00	116.00	91.05
14PQ-06-5	236.00	362.00	30.89	12.61	15.74	2.02	39.35	120.00	173.00	5.04	2 014.00	28.43	157.00	122.00	93.89
14PQ-06-6	238.00	322.00	30.65	14.38	16.66	2.71	40.87	111.00	172.00	5.22	1 952.00	33.36	149.00	117.00	90.53
样品编号	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	LREE	HREE	REE	δEu
14PQ-06-2	36.36	25.10	8.79	17.13	17.38	14.92	14.13	14.32	14.51	14.53	16.14	83.03	14.38	97.41	0.14
14PQ-06-3	67.19	42.48	12.07	27.30	25.13	20.47	18.73	17.70	16.86	16.41	17.72	154.00	19.41	173.00	0.12
14PQ-06-5	68.46	41.96	12.76	26.67	23.80	19.09	17.31	16.25	15.69	14.82	16.14	160.00	18.21	178.00	0.12
14PQ-06-6	67.19	42.29	12.93	28.13	25.94	20.98	19.43	18.61	18.43	18.06	19.69	154.00	20.29	174.00	0.12

Fig.5 TAS diagram of the Puquan granitic pluton (base map after reference [27])

Fig.6 SiO2-K2O (a) and A/CNK-A/NK (b) diagrams of the Puquan granitic pluton (base map after reference [28-29])

Table 3 Zircon Hf isotope data and related parameters

样品测点	t/Ma	¹⁷⁶Lu/¹⁷⁷Hf±1σ	¹⁷⁶Yb/¹⁷⁷Hf±1σ	¹⁷⁶Hf/¹⁷⁷Hf±1σ	ε_Hf (0)	ε_Hf (t)	t_DM /Ma	$t D M 2$ /Ma	f(¹⁷⁶Hf/ ¹⁷⁷Hf)
14PQ-6-1	441.0	0.001 113±0.000 075	0.034 595±0.003 795	0.282 379±0.000 017	-13.91	-4.53	1 237	1 704	-0.97
14PQ-6-2	441.0	0.000 657±0.000 018	0.020 395±0.000 425	0.282 409±0.000 015	-12.83	-3.32	1 180	1 628	-0.98
14PQ-6-3	440.9	0.001 380±0.000 033	0.042 456±0.001 245	0.282 459±0.000 020	-11.06	-1.76	1 132	1 530	-0.96
14PQ-6-4	440.4	0.002 461±0.000 011	0.075 485±0.000 503	0.282 480±0.000 017	-10.33	-1.36	1 136	1 505	-0.93
14PQ-6-5	440.7	0.001 245±0.000 047	0.040 750±0.001 700	0.282 380±0.000 018	-13.88	-4.55	1 240	1 705	-0.96
14PQ-6-6	441.5	0.002 336±0.000 027	0.074 280±0.001 097	0.282 495±0.000 017	-9.81	-0.78	1 110	1 469	-0.93
14PQ-6-7	440.2	0.001 102±0.000 010	0.033 945±0.000 598	0.282 488±0.000 019	-10.04	-0.67	1 083	1 461	-0.97
14PQ-6-8	440.4	0.002 367±0.000 011	0.063 705±0.000 147	0.282 501±0.000 017	-9.58	-0.58	1 102	1 456	-0.93
14PQ-6-9	440.9	0.002 038±0.000 073	0.054 017±0.001 510	0.282 540±0.000 020	-8.19	0.92	1 035	1 362	-0.94
14PQ-6-10	440.9	0.000 935±0.000 017	0.026 944±0.000 805	0.282 460±0.000 017	-11.05	-1.62	1 118	1 521	-0.97
14PQ-6-11	441.5	0.001 372±0.000 014	0.037 329±0.000 375	0.282 454±0.000 015	-11.23	-1.92	1 139	1 541	-0.96
14PQ-6-12	441.5	0.001 372±0.000 007	0.044 861±0.000 117	0.282 445±0.000 015	-11.55	-2.24	1 151	1 561	-0.96
14PQ-6-13	441.5	0.002 688±0.000 015	0.067 995±0.000 601	0.282 098±0.000 021	-23.83	-14.92	1 700	2 351	-0.92
14PQ-6-14	441.5	0.002 930±0.000 015	0.092 515±0.000 660	0.282 599±0.000 022	-6.12	2.75	974	1 247	-0.91
14PQ-6-15	441.5	0.001 564±0.000 021	0.045 459±0.000 903	0.282 456±0.000 019	-11.19	-1.93	1 143	1 541	-0.95
14PQ-6-16	441.6	0.001 419±0.000 009	0.044 094±0.000 326	0.282 372±0.000 016	-14.16	-4.86	1 257	1 725	-0.96
14PQ-6-17	441.1	0.001 336±0.000 013	0.042 220±0.000 586	0.282 423±0.000 017	-12.35	-3.04	1 182	1 611	-0.96
14PQ-6-18	440.9	0.001 034±0.000 063	0.030 677±0.001 124	0.282 407±0.000 024	-12.91	-3.51	1 195	1 640	-0.97

Table 3 Zircon Hf isotope data and related parameters

样品测点	t/Ma	¹⁷⁶Lu/¹⁷⁷Hf±1σ	¹⁷⁶Yb/¹⁷⁷Hf±1σ	¹⁷⁶Hf/¹⁷⁷Hf±1σ	ε_Hf (0)	ε_Hf (t)	t_DM /Ma	$t D M 2$ /Ma	f(¹⁷⁶Hf/ ¹⁷⁷Hf)
14PQ-6-1	441.0	0.001 113±0.000 075	0.034 595±0.003 795	0.282 379±0.000 017	-13.91	-4.53	1 237	1 704	-0.97
14PQ-6-2	441.0	0.000 657±0.000 018	0.020 395±0.000 425	0.282 409±0.000 015	-12.83	-3.32	1 180	1 628	-0.98
14PQ-6-3	440.9	0.001 380±0.000 033	0.042 456±0.001 245	0.282 459±0.000 020	-11.06	-1.76	1 132	1 530	-0.96
14PQ-6-4	440.4	0.002 461±0.000 011	0.075 485±0.000 503	0.282 480±0.000 017	-10.33	-1.36	1 136	1 505	-0.93
14PQ-6-5	440.7	0.001 245±0.000 047	0.040 750±0.001 700	0.282 380±0.000 018	-13.88	-4.55	1 240	1 705	-0.96
14PQ-6-6	441.5	0.002 336±0.000 027	0.074 280±0.001 097	0.282 495±0.000 017	-9.81	-0.78	1 110	1 469	-0.93
14PQ-6-7	440.2	0.001 102±0.000 010	0.033 945±0.000 598	0.282 488±0.000 019	-10.04	-0.67	1 083	1 461	-0.97
14PQ-6-8	440.4	0.002 367±0.000 011	0.063 705±0.000 147	0.282 501±0.000 017	-9.58	-0.58	1 102	1 456	-0.93
14PQ-6-9	440.9	0.002 038±0.000 073	0.054 017±0.001 510	0.282 540±0.000 020	-8.19	0.92	1 035	1 362	-0.94
14PQ-6-10	440.9	0.000 935±0.000 017	0.026 944±0.000 805	0.282 460±0.000 017	-11.05	-1.62	1 118	1 521	-0.97
14PQ-6-11	441.5	0.001 372±0.000 014	0.037 329±0.000 375	0.282 454±0.000 015	-11.23	-1.92	1 139	1 541	-0.96
14PQ-6-12	441.5	0.001 372±0.000 007	0.044 861±0.000 117	0.282 445±0.000 015	-11.55	-2.24	1 151	1 561	-0.96
14PQ-6-13	441.5	0.002 688±0.000 015	0.067 995±0.000 601	0.282 098±0.000 021	-23.83	-14.92	1 700	2 351	-0.92
14PQ-6-14	441.5	0.002 930±0.000 015	0.092 515±0.000 660	0.282 599±0.000 022	-6.12	2.75	974	1 247	-0.91
14PQ-6-15	441.5	0.001 564±0.000 021	0.045 459±0.000 903	0.282 456±0.000 019	-11.19	-1.93	1 143	1 541	-0.95
14PQ-6-16	441.6	0.001 419±0.000 009	0.044 094±0.000 326	0.282 372±0.000 016	-14.16	-4.86	1 257	1 725	-0.96
14PQ-6-17	441.1	0.001 336±0.000 013	0.042 220±0.000 586	0.282 423±0.000 017	-12.35	-3.04	1 182	1 611	-0.96
14PQ-6-18	440.9	0.001 034±0.000 063	0.030 677±0.001 124	0.282 407±0.000 024	-12.91	-3.51	1 195	1 640	-0.97

Fig.7 Primitive-mantle-normalized multi-element (a) and chondrite-normalized REE (b) patterns of the Puquan granitic pluton (normalizing values from reference [30])

Fig. 8 Zircon εHf(t) (a) and tDM2 (b) histogram of the Puquan granitic pluton

Table 4 Age summary of Caledonian granites in the Dayaoshan uplift zone

岩体	岩性	测年结果/Ma	资料来源	岩体	岩性	测年结果/Ma	资料来源
朴全	中-细粒花岗岩	441.1±1.2	本文资料	夏郢-2	二长花岗岩	452.5±1.7	文献[3]
平头背	花岗闪长斑岩	432.0±1.7	文献[16]	大平	闪长岩	454.2±3.0	文献[3]
武界	花岗闪长岩	434.5±0.8	文献[17]	大村	英云闪长岩	456.9±2.0	文献[3]
社山	花岗闪长岩	435.5±1.3	文献[16]	大村	花岗闪长岩	451.5±1.3	文献[34]
大王冲(湾岛金矿)	花岗斑岩	436.1±2.1	文献[31]	大进	二长花岗岩	457.7±1.2	文献[18]
大王冲(湾岛金矿)	花岗斑岩	436.3±3.0	文献[31]	新坪	花岗斑岩	462.9±6.4	文献[35]
大王冲(湾岛金矿)	花岗斑岩	436.4±2.4	文献[31]	龙新-1	花岗闪长岩	463.6±1.3	文献[3]
大王顶	花岗闪长斑岩	463.0±5.0	文献[32]	龙新-2	花岗岩	463.7±1.7	文献[3]
古龙	石英闪长岩	445.9±1.2	文献[33]	路峒	闪长岩	465.1±2.3	文献[3]
莲峒	花岗闪长岩	445.5±2.2	文献[3]	上木水村	花岗闪长岩	465.5±2.3	文献[3]
大坡-1	闪长岩	451.9±3.3	文献[3]	上木水矿点	花岗闪长岩	466.3±4.0	文献[3]
大坡-2	花岗闪长岩	451.4±2.8	文献[3]	夏郢-1	花岗闪长岩	468.2±1.2	文献[3]

Fig.9 SiO2-Ce (a) and Rb-Th (b) diagrams of Puquan granitic pluton (base map of (a) and (b) after reference [65]and [66], respectively)

Fig.10 SiO2-P2O5 diagram of the Puquan granitic pluton (base map after reference [48])

Fig.11 U-Pb age vs. εHf(t) (a) and 176Lu/177Hf (b) diagrams of zircons from the Puquan granitic pluton (base map after reference [40])

Fig.12 Y-Nb (a) and (Nb+Y)-Rb (b) diagrams of the Puquan granitic pluton (base map after reference [74])

Fig.13 Fe-Mg-Ca tectonic discrimination diagrams for the Puquan granitic pluton (base map after reference [29])

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