安徽繁昌浮山钾长花岗岩成因及其构造意义——来自锆石U-Pb年龄、岩石地球化学和Hf同位素的证据

庞振山; 高浮萍; 朱晓强; 东前; 林鲁军

安徽繁昌浮山钾长花岗岩成因及其构造意义——来自锆石U-Pb年龄、岩石地球化学和Hf同位素的证据

1.
中国地质调查局发展研究中心, 北京 100120

2.
中国地质大学(北京)地质过程与矿产资源国家重点实验室, 北京 100083

基金项目:
中国地质调查局项目《皖赣沿江地区壳幔相互作用与多成因矽卡岩矿床成矿机制研究》（编号：121201113069900）、《安徽铜陵矿集区找矿预测》（编号：12120115034401）

详细信息

作者简介: 庞振山(1968-),男,教授级高级工程师,矿物学、岩石学、矿床学专业。E-mail:pzs927@163.com

通讯作者: 高浮萍(1982-),女,博士,矿物学、岩石学、矿床学专业。E-mail:gfp2000@163.com

中图分类号: P588.12⁺1

收稿日期: 2015-07-01

修回日期: 2015-09-15

刊出日期: 2017-03-25

Petrogenesis and tectonic implications of the Fushan moyite in the Fanchang area,Anhui Province-Evidence from zircon U-Pb age,geochemistry and Hf isotopes

1.
Development and Research Center of China Geological Survey, Beijing 100037, China

2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

More Information

Corresponding author: GAO Fuping, gfp2000@163.com

Received Date: 01 July 2015

Revised Date: 15 September 2015

Publish Date: 25 March 2017

摘要

摘要:
安徽繁昌地区是长江中下游铜铁金多金属成矿带的重要组成部分。对繁昌浮山钾长花岗岩开展了详细的岩石学、岩石地球化学、锆石U-Pb 年代学和Lu-Hf 同位素分析，并在此基础上探讨了岩石成因及动力学背景。岩石地球化学研究表明，浮山钾长花岗岩为硅过饱和的准铝质-弱过铝质富碱富钾岩石，具有较高的Ga/Al 值、TFeO/MgO 值、Zr+Nb+Ce+Y 和稀土元素含量，显示出A 型花岗岩的地球化学特征。此外，浮山钾长花岗岩具有低(⁸⁷Sr/⁸⁶Sr)_i、高δ¹⁸O、负ε_Nd(t)和ε_Hf(t)、负Eu 异常等地球化学特征。繁昌浮山钾长花岗岩LA-ICP-MS 锆石²⁰⁶Pb/²³⁸U 年龄为124.9±2.0Ma（n=15，MSWD=0.20），被解释为钾长花岗岩的形成年龄。与长江中下游地区A 型花岗岩带中的其他岩体为同期岩浆活动的产物，均形成于早白垩世。结合岩石学和区域地质资料，表明浮山钾长花岗岩可能是新生下地壳物质部分熔融作用形成的，形成浮山钾长花岗岩的新生下地壳可能由来源于富集地幔岩石圈的玄武质-安山质岩浆和少量结晶变质基底物质组成。根据锆石U-Pb 年龄，结合区域地质资料分析，晚侏罗世—早白垩世，长江中下游地区经历挤压向伸展构造应力场的转变，随时间推移，伸展作用逐渐增大，至125Ma 左右该区岩石圈可能达到了伸展的高峰期。
- 钾长花岗岩 /
- LA-ICP-MS 锆石U-Pb 年龄 /
- Lu-Hf 同位素 /
- 岩石成因 /
- 长江中下游地区
Abstract:
The Fanchang area is one of the important components of the Middle-Lower Yangtze Valley metallogenic belt. The Fushan moyite is one of the most representative and important granitic intrusions. In this paper, LA-ICP-MS zircon U-Pb dating, petrographic observations and geochemical and Hf isotopic analysis were carried out for the Fushan moyite in the Fanchang area, with the emphasis placed on the analysis of petrogenesis and tectonic implications of the Fushan moyite. The Fushan moyite has a clear A-type geochemical signature, e.g., it is of metaluminous to weakly peraluminous nature (A/CNK=0.91~1.11) and has high SiO₂ (averagely 71.52%), total alkalis (Na₂O+K₂O=8.85%~9.60%), K*(K₂O/Na₂O=1.06~1.57), Fe*(TFeO/MgO=2.49~10.2), rare earth elements (ΣREE=278×10^-6~376×10^-6), Ga/Al ratio (2.90~3.31) and HFSE (Zr+Nb+Ce+Y=421.8×10^-6~655.0×10^-6). LAICP-MS zircon U-Pb dating yielded a concordant weighted mean ²⁰⁶Pb/²³⁸Pb age of 124.9±2.0Ma, which is similar to ages of other A-type granites in the Middle-Lower Yangtze Valley metallogenic belt, indicating that all A-type granites were formed in the Early Cretaceous. Zircons from this pluton yielded ε_Hf(t) values between -5.8 and -10.0, which, together with U-Pb age,(⁸⁷Sr/⁸⁶Sr)_I, δ¹⁸O and ε_Nd(t) values of the Fushan moyite, suggest the importance of juvenile material in the magma source, and the juvenile material was composed of the basaltic andesitic magma from enriched mantle lithosphere and minor crystalline metamorphic basement. These data, together with other accurate dating data of intermediate-acid plutons and volcanic rocks in the Middle-Lower Yangtze Valley metallogenic belt, support the peak time of crustal extension at ~125Ma in this area.
- moyite /
- LA-ICP-MS zircon U-Pb ages /
- Lu-Hf isotopes /
- petrogenesis /
- Middle-Lower Yangtze Valley

HTML全文

图 1 安徽繁昌浮山钾长花岗岩体地质略图（图a 据参考文献[4]修改；图b 据参考文献①修改）

Figure 1.

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图 2 安徽繁昌浮山钾长花岗岩典型照片

Figure 2.

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图 3 繁昌地区浮山钾长花岗岩SiO₂-(Na₂O+K₂O)图

Figure 3.

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图 4 繁昌地区浮山钾长花岗岩A/CNK-A/NK 图

Figure 4.

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图 5 A 型花岗岩判别图解（底图据参考文献[45]）

Figure 5.

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图 6 繁昌地区浮山钾长花岗岩球粒陨石标准化微量元素蛛网图（球粒陨石数据据参考文献[47]）

Figure 6.

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图 7 繁昌地区浮山钾长花岗岩球粒陨石标准化稀土元素配分模式图（球粒陨石数据据参考文献[48]）

Figure 7.

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图 8 繁昌地区浮山钾长花岗岩中锆石的阴极发光（CL）图像

Figure 8.

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图 9 繁昌地区浮山钾长花岗岩锆石U-Pb 谐和图

Figure 9.

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图 10 繁昌地区浮山钾长花岗岩Hf 同位素分布直方图

Figure 10.

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图 11 繁昌地区浮山钾长花岗岩t-ε_Hf(t)图解

Figure 11.

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图 12 繁昌地区浮山钾长花岗岩元素协变图

Figure 12.

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表 1 繁昌地区浮山钾长花岗岩主量元素分析结果

Table 1. Major elements composition of samples from the Fushan moyite in Fanchang area, Anhui Province

%
样品编号	SiO₂	TiO₂	Al₂O₃	TFeO	MnO	MgO	CaO	Na₂O	K₂O	P₂O₅	烧失量	总量	Na₂O+K₂O	K₂O/Na₂O	A/CNK	A/NK	TFeO/MgO
FC108	71.20	0.36	13.88	1.75	0.10	0.47	1.02	4.41	5.14	0.07	1.19	99.59	9.55	1.17	0.95	1.08	3.71
FC109	70.39	0.36	14.40	1.81	0.10	0.46	0.86	4.14	5.31	0.10	1.67	99.60	9.45	1.28	1.02	1.15	3.90
FC114	63.05	0.82	15.43	3.51	0.18	1.41	2.56	4.40	4.67	0.30	3.06	99.38	9.07	1.06	0.91	1.25	2.49
FC118	69.97	0.38	14.20	1.89	0.09	0.63	1.15	4.27	5.08	0.09	1.81	99.56	9.35	1.19	0.97	1.13	2.99
FS002a	73.03	0.26	13.79	1.35	0.08	0.25	0.64	3.86	5.42	0.03	0.82	99.53	9.28	1.40	1.03	1.13	5.40
FS003a	73.14	0.30	13.89	1.45	0.08	0.26	0.67	3.90	5.12	0.03	0.70	99.54	9.02	1.31	1.05	1.16	5.58
FS019b	73.22	0.27	13.60	1.34	0.11	0.37	0.11	4.18	5.38	0.03	0.45	99.06	9.56	1.29	1.05	1.07	3.62
FS020b	73.61	0.26	13.14	1.62	0.01	0.23	0.17	3.45	5.40	0.03	1.11	99.04	8.85	1.57	1.11	1.14	7.04
FS021b	73.55	0.27	13.42	1.42	0.06	0.28	0.24	3.55	5.40	0.03	0.86	99.07	8.95	1.52	1.11	1.15	5.08
FS022b	73.28	0.27	12.91	2.12	0.10	0.33	0.36	4.20	5.40	0.03	0.41	99.42	9.60	1.29	0.96	1.01	6.44
FS023b	72.24	0.28	13.51	1.22	0.14	0.12	0.68	4.05	5.42	0.03	0.50	98.20	9.47	1.34	0.98	1.08	10.20
注：a 数据据参考文献[20]；b 数据据参考文献[1]

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表 2 繁昌地区浮山钾长花岗岩微量、稀土元素分析结果

Table 2. Trace and rare earth elements composition of samples from the Fushan moyite in Fanchang area, Anhui Province

10^-6
样品编号	Ba	Rb	Th	Nb	Ta	Sr	Nd	Sm	Zr	Hf	Y	Sc	V	Cr	Co	Ni	U	Ga
FC108	255	228	28.70	43.10	2.41	118	64.40	12.40	230	8.01	50.70	12.00	18.60	0.64	1.54	0.81	5.80	24.30
FC109	403	223	27.20	35.70	2.01	119	49.40	9.13	213	7.33	39.10	8.58	18.50	0.32	1.42	0.43	6.30	22.10
FC114	899	193	19.50	33.40	1.81	292	63.40	11.70	430	9.57	46.60	9.09	68.30	0.26	5.82	0.60	6.43	23.50
FC118	425	216	27.70	37.90	2.11	160	60.50	11.10	220	7.32	46.90	7.38	20.50	0.35	1.83	0.48	10.50	23.80
FS002a	116	226	25.20	37.80	2.14	50.60	51.50	9.66	356	9.63	57.00	4.59	4.52	0.89	0.38	0.77	5.50	―
FS003a	98	207	24.80	40.30	2.26	49.90	63.10	11.80	362	10.40	61.60	6.18	6.80	4.00	0.78	2.60	5.07	―
样品编号	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu	∑REE	LREE/HREE	δEu	(La/Yb)N
FC108	85.20	158.0	18.30	64.40	12.40	1.02	11.00	1.82	9.16	1.80	5.37	0.98	5.82	0.85	376.13	9.22	0.26	10.50
FC109	69.40	134.0	13.40	49.40	9.13	0.98	8.26	1.32	6.87	1.31	4.10	0.75	4.50	0.66	304.08	9.95	0.34	11.06
FC114	79.00	145.0	16.60	63.40	11.70	1.93	10.80	1.59	8.41	1.62	4.84	0.85	5.03	0.72	351.49	9.38	0.52	11.27
FC118	77.40	156.0	16.70	60.50	11.10	1.14	10.40	1.60	8.37	1.56	4.63	0.85	5.19	0.76	356.19	9.68	0.32	10.70
FS002a	72.10	98.3	15.20	51.50	9.66	0.77	7.98	1.31	8.11	1.62	5.30	0.74	4.90	0.77	278.26	8.05	0.26	10.55
FS003a	91.20	130.0	18.40	63.10	11.80	0.90	9.93	1.59	9.47	1.81	5.80	0.75	5.42	0.81	350.98	8.86	0.25	12.07
注：a 数据据参考文献[20]

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表 3 繁昌地区浮山钾长花岗岩LA-ICP-MS 锆石U-Th-Pb 同位素数据

Table 3. LA-ICP-MS zircon U-Th-Pb analyses of samples from the Fushan moyite in Fanchang area

点序号	含量/10^-6					Th/U	同位素比值								年龄/Ma
点序号	²⁰⁶Pb	²⁰⁷Pb	²⁰⁸Pb	²³²Th	²³⁸U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁸Pb/²³²Th	1σ	²⁰⁷Pb/235U	1σ	²⁰⁶Pb/²³⁸U	1σ
9	46.45	3.19	5.4	410	570	0.72	0.0485	0.0072	0.1324	0.018	0.0198	0.0012	0.0068	0.00080	126	16	126.30	7.6
10	58.36	2.96	6.81	446	628	0.71	0.0486	0.0037	0.1323	0.0092	0.0198	0.00062	0.0068	0.00041	126	8.2	126.10	3.9
13	82.66	4.29	14.03	1186	979	1.21	0.0485	0.0030	0.1300	0.0075	0.0194	0.00052	0.0056	0.00024	124	6.7	124.00	3.3
19	42.98	2.512	5.04	368	491	0.75	0.0495	0.0035	0.1305	0.0086	0.0191	0.00058	0.0062	0.00035	125	7.7	122.10	3.7
26	79.23	5.09	13.31	868	897	0.97	0.0490	0.0041	0.1331	0.010	0.0197	0.00071	0.0072	0.00041	127	9.3	125.70	4.5
27	58.3	3.07	12.66	855	746	1.15	0.0485	0.0028	0.1324	0.0071	0.0198	0.00049	0.0074	0.00026	126	6.3	126.20	3.1
28	86.33	4.53	14.05	764	913	0.84	0.0488	0.0019	0.1338	0.0048	0.0199	0.00036	0.0070	0.00020	128	4.3	126.80	2.3
29	70.84	3.96	14.48	1063	860	1.24	0.0492	0.0024	0.1321	0.0059	0.0195	0.00042	0.0062	0.00019	126	5.3	124.20	2.7
35	56.47	3.35	6.98	481	621	0.78	0.0489	0.0049	0.1315	0.012	0.0195	0.00083	0.0065	0.00049	126	11	124.50	5.2
38	59.17	3.44	11.78	797	642	1.24	0.0483	0.0071	0.1358	0.018	0.0204	0.0012	0.0064	0.00061	129	16	130.00	7.9
40	38.84	2.138	10.4	765	486	1.57	0.0484	0.0030	0.1295	0.0073	0.0194	0.00051	0.0061	0.00021	124	6.5	123.90	3.2
41	36.15	2.2	6.3	489	393	1.24	0.0485	0.0079	0.1304	0.020	0.0195	0.0013	0.0056	0.00056	125	18	124.60	8.4
46	18.3	0.929	3.82	306	213	1.44	0.0490	0.012	0.1323	0.029	0.0196	0.0018	0.0059	0.00073	126	26	125.10	11
53	49.47	4.3	11.19	820	624	1.31	0.0477	0.0073	0.1263	0.018	0.0192	0.0012	0.0054	0.00048	121	16	122.70	7.7
50	42.08	3.091	7.96	622	560	1.11	0.0487	0.0037	0.1286	0.0088	0.0192	0.00062	0.0056	0.00029	123	8.0	122.30	3.9

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表 4 繁昌地区浮山钾长花岗岩锆石原位微区Hf 同位素分析结果

Table 4. Hf isotope analyses of zircons from the Fushan moyite in Fanchang area

样品编号	t/Ma	¹⁷⁶Yb/¹⁷⁷Hf	2σ	¹⁷⁶Lu/¹⁷⁷Hf	2σ	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf（0）	ε_Hf（t）	T_DM1/Ma	T_DM2/Ma	¹⁷⁶Hf/¹⁷⁷Hf（t）	f_Lu/Hf
1	125	0.085	0.00040	0.0029	0.000012	0.282469	0.000016	-10.70	-8.20	1165	1696	0.282463	-0.91
9	126	0.038	0.00027	0.0014	0.000013	0.282460	0.000015	-11.04	-8.38	1131	1709	0.282457	-0.96
10	126	0.049	0.00032	0.0017	0.000011	0.282414	0.000017	-12.67	-10.05	1209	1814	0.282409	-0.95
13	124	0.049	0.00016	0.0017	0.000004	0.282461	0.000015	-10.98	-8.40	1139	1709	0.282457	-0.95
19	122	0.049	0.00041	0.0018	0.000017	0.282439	0.000015	-11.79	-9.25	1174	1761	0.282435	-0.95
22	130	0.054	0.00028	0.0020	0.000014	0.282472	0.000020	-10.61	-7.92	1133	1683	0.282467	-0.94
26	126	0.069	0.00087	0.0024	0.000024	0.282500	0.000018	-9.61	-7.05	1102	1624	0.282495	-0.93
27	126	0.042	0.00036	0.0015	0.000011	0.282485	0.000019	-10.15	-7.51	1099	1654	0.282481	-0.95
28	127	0.083	0.00061	0.0028	0.000020	0.282477	0.000016	-10.42	-7.87	1151	1677	0.282471	-0.91
29	124	0.086	0.00095	0.0030	0.000026	0.282506	0.000020	-9.40	-6.92	1112	1615	0.282499	-0.91
35	125	0.042	0.00015	0.0016	0.000007	0.282458	0.000019	-11.09	-8.49	1139	1715	0.282455	-0.95
38	130	0.052	0.00025	0.0019	0.000006	0.282474	0.000016	-10.53	-7.84	1126	1678	0.282470	-0.94
40	124	0.073	0.00046	0.0025	0.000017	0.282456	0.000018	-11.17	-8.66	1171	1724	0.282450	-0.92
41	125	0.092	0.00191	0.0032	0.000064	0.282486	0.000019	-10.10	-7.63	1148	1660	0.282479	-0.90
46	125	0.051	0.00031	0.0019	0.000012	0.282479	0.000019	-10.35	-7.77	1119	1669	0.282475	-0.94
50	122	0.043	0.00085	0.0016	0.000027	0.282535	0.000030	-8.38	-5.82	1031	1545	0.282531	-0.95
53	123	0.091	0.00063	0.0032	0.000023	0.282483	0.000019	-10.23	-7.80	1154	1669	0.282475	-0.90
54	125	0.041	0.00045	0.0015	0.000016	0.282460	0.000019	-11.02	-8.40	1134	1709	0.282457	-0.96

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