广西大瑶山朴全岩体形成时代、成因及地质意义

doi:10.19657/j.geoscience.1000-8527.2020.046

现代地质 ›› 2020, Vol. 34 ›› Issue (06): 1277-1290.DOI: 10.19657/j.geoscience.1000-8527.2020.046

广西大瑶山朴全岩体形成时代、成因及地质意义

陈欢¹^,²(), 康志强¹^,²(), 吴佳昌³, 李岱鲜¹^,², 曹延¹^,², 韦天伟¹^,², 韦乃韶¹^,², 刘迪¹^,², 周桐¹^,², 刘冬梅¹^,², 蓝海洋⁴

1.桂林理工大学地球科学学院,广西桂林 541004
2.广西有色金属隐伏矿床勘查及材料开发协同创新中心,广西桂林 541004
3.中国冶金地质总局广西地质勘查院,广西南宁 530000
4.辽宁省冶金地质勘查研究院有限责任公司,辽宁鞍山 114038

收稿日期:2019-06-05 修回日期:2020-07-02 出版日期:2020-12-22 发布日期:2020-12-22
通讯作者: 康志强
作者简介:康志强,男,教授,1979年出生,岩石地球化学专业,主要从事岩石、矿床地球化学研究。Email:zk99201@163.com。
陈欢,男,硕士研究生,1994年出生,矿物学、岩石学、矿床学专业,主要从事岩石、矿床地球化学研究。Email:1346926354@qq.com。
基金资助:
国家自然科学基金项目(41863005);国家自然科学基金项目(41463001);广西自然科学基金项目(2016GXNSF AA380012)

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

CHEN Huan¹^,²(), KANG Zhiqiang¹^,²(), WU Jiachang³, LI Daixian¹^,², CAO Yan¹^,², WEI Tianwei¹^,², WEI Naishao¹^,², LIU Di¹^,², ZHOU Tong¹^,², LIU Dongmei¹^,², LAN Haiyang⁴

1. School of Earth Science, Guilin University of Technology, Guilin, Guangxi 541004, China
2. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin, Guangxi 541004, China
3. Guangxi Geological Exploration Institute of China Metallurgical Geology Bureau, Nanning, Guangxi 530000, China
4. Liaoning Metallurgical Geological Exploration Research Institute Co.Ltd., Anshan, Liaoning 114038, China

Received:2019-06-05 Revised:2020-07-02 Online:2020-12-22 Published:2020-12-22
Contact: KANG Zhiqiang

摘要/Abstract

摘要：

广西大瑶山隆起区广泛分布加里东期岩浆岩,相关研究对于认识大瑶山隆起区的地球动力学背景、演化机制及找矿工作具有指示意义。对大瑶山隆起区西北部的朴全岩体进行详细的年代学、元素与 Hf 同位素地球化学研究。LA-ICP-MS 锆石U-Pb定年结果显示,朴全岩体的成岩年龄为(441.1±1.2) Ma(MSWD= 0.14),属晚奥陶世。朴全岩体为I型中-细粒花岗岩,具高硅(SiO₂含量为68.50%~72.83%)、中铝(Al₂O₃含量为13.66%~14.42%)和中碱(K₂O/Na₂O比值为0.75~1.33,全碱含量为7.17%~8.34%)等特征,属高钾钙碱性系列,A/CNK值为0.89~1.18,整体属于准铝质-弱过铝质花岗岩。岩体富集Rb、Th、U、Pb等元素,亏损Ba、Sr、Nb、Ti等元素。稀土总量为97.41×10^-6~178.80×10^-6,具有强烈的负Eu异常(δEu=0.12~0.14)特征。该岩体的锆石ε_Hf(t)值大多数为负值,整体变化于-14.92~2.75之间,平均值为-2.67。在ε_Hf(t)-t图解和(¹⁷⁶Lu/¹⁷⁷Hf)-t图解上,样品值均落在球粒陨石演化线之下,两阶段模式年龄 $t D M 2$ =1.2~2.4 Ga,平均值1.6 Ga,指示其可能来源于中元古代地壳物质的部分熔融,并受到了幔源组分的影响,表明朴全岩体形成于扬子陆块与华夏陆块碰撞挤压的构造背景下。

关键词: 朴全岩体, LA-ICP-MS 锆石U-Pb定年, Hf 同位素, 加里东期, 广西大瑶山

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)

中图分类号:

陈欢, 康志强, 吴佳昌, 李岱鲜, 曹延, 韦天伟, 韦乃韶, 刘迪, 周桐, 刘冬梅, 蓝海洋. 广西大瑶山朴全岩体形成时代、成因及地质意义[J]. 现代地质, 2020, 34(06): 1277-1290.

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.

图/表 17

图1 广西大瑶山地区花岗岩类分布图(底图据文献[3]修改) Ⅰ .桂中凹陷;Ⅱ .大瑶山隆起;Ⅲ .钦防海槽;Ⅳ .云开隆起;Ⅴ .粤中隆起

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

图2 朴全花岗岩体地质简图(据1∶200 000区域地质图修改)

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

图3 朴全中-细粒花岗岩野外露头(a)、手标本(b)及显微镜下照片(c—d) Qtz.石英;Or.钾长石;Pl.斜长石;Bt.黑云母

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

表1 朴全花岗岩体LA-(MC)-ICP-MS锆石U-Pb分析结果

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

图4 朴全花岗岩体锆石阴极发光图像((a),年龄单位为Ma)及U-Pb 年龄谐和图(b)

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

表2 朴全花岗岩体主量元素(wB/%)、微量元素和稀土元素(wB/10-6)含量测试结果

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

表2 朴全花岗岩体主量元素(wB/%)、微量元素和稀土元素(wB/10-6)含量测试结果

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

图5 朴全花岗岩体 TAS分类图解(底图引自文献[27])

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

图6 朴全花岗岩体SiO2-K2O(a)和A/CNK-A/NK图解(b) ((a)底图引自文献[28];(b)底图引自文献[29])

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

表3 锆石Hf同位素原位分析结果及相关参数

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

表3 锆石Hf同位素原位分析结果及相关参数

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

图7 朴全花岗岩体原始地幔标准化微量元素蛛网图解(a) 和稀土元素球粒陨石标准化图解(b)(标准化数据据文献[30])

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

图8 朴全花岗岩体锆石εHf(t)直方分布图(a)和tDM2直方分布图(b)

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

表4 大瑶山隆起区加里东期花岗岩测年结果

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]

图9 朴全花岗岩体 SiO2-Ce判别图(a)与Rb-Th关系图(b) ( (a)底图据文献[65];(b)底图引自文献[66])

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)

图10 朴全花岗岩体 SiO2-P2O5关系图(底图引自文献[48])

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

图11 朴全花岗岩体锆石t-εHf(t)图解(a)和t-176Lu/177Hf图解(b)(底图引自文献[40])

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])

图12 朴全花岗岩体Y-Nb (a)和(Nb+Y)-Rb图解(b)(底图引自文献[74])

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

图13 朴全花岗岩体 Fe-Mg-Ca构造环境判别图解(底图引自文献[29]) IAG.岛弧花岗岩类;CAG.大陆花岗岩类;CCG.大陆碰撞花岗岩类;POG.造山后花岗岩类;RRG.与裂谷有关的花岗岩类;CEUG.陆内造陆隆起花岗岩类

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

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广西大瑶山朴全岩体形成时代、成因及地质意义

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

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