赣东北东乡铜矿侵入岩与成矿年龄的确定及意义

蔡逸涛; 倪培; 王国光; 陈辉; 张洁

doi:10.3799/dqkx.2017.500

赣东北东乡铜矿侵入岩与成矿年龄的确定及意义

doi: 10.3799/dqkx.2017.500

蔡逸涛^1,2,3,4,,
倪培^1,2,3, ,,
王国光^1,2,3,
陈辉^1,2,3,
张洁⁴

1.
南京大学内生金属矿床成矿机制研究国家重点实验室, 江苏南京 210093
2.
南京大学地球科学与工程学院, 江苏南京 210093
3.
南京大学地质流体研究所, 江苏南京 210093
4.
南京地质矿产研究所, 江苏南京 210016

基金项目:

国家重点研发计划 2016YFC0600206

中国地质调查局项目 20089935

详细信息

作者简介:
蔡逸涛(1982-), 男, 助理研究员, 研究方向为内生金属矿床成矿规律及流体包裹体研究

通讯作者:
倪培, E-mail:peini@nju.edu.cn

中图分类号: P597
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出版历程
- 收稿日期: 2016-11-30
- 刊出日期: 2017-09-15

Determination of Diagenetic and Metallogenic Age and Their Significance in Dongxiang Copper Deposit, Northeast Jiangxi Province, China

Cai Yitao^{1,2,3,4
,},
Ni Pei^{1,2,3
, ,},
Wang Guoguang^1,2,3,
Chen Hui^1,2,3,
Zhang Jie⁴

1.
State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China
2.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
3.
Institute of Geo-Fluid Research, Nanjing University, Nanjing 210093, China
4.
Nanjing Institute of Geology and Mineral Resources, Nanjing 210016, China

摘要

摘要: 对于赣东北地区东乡铜矿床的成因机制，一直存在着海西期海底喷流沉积成矿作用与燕山期岩浆热液成矿作用的成因争议，获得精确的成矿年龄是解决这一成因争议的关键.利用LA-ICP-MS技术对矿区中与矿体伴生的花岗闪长斑岩进行了锆石U-Pb同位素定年，两个花岗闪长斑岩样品的形成年龄分别为164±2 Ma、160±1 Ma.同时对东乡铜矿床块状硫化物矿石中的石英，开展了流体包裹体Rb-Sr同位素定年研究，获得一条等时线年龄为161.8±9.6 Ma（MSDW=1.3）.结合对流体包裹体以及区域成矿作用的研究，认为该年龄可以代表东乡铜矿的形成时代.这些定年结果表明，东乡铜矿的形成可能与该区燕山期花岗闪长斑岩侵入活动带来的岩浆流体成矿作用有关.
- 流体包裹体 /
- Rb-Sr等时线 /
- 年代学 /
- 成矿年龄 /
- 东乡铜矿 /
- 矿床
Abstract: The formation of the Dongxiang copper deposit has been hotly debated for the last 20 years. In particular, the origin of the Dongxiang Cu deposit was controversial, with models ranging from Hercynian SEDEX (sedimentary exhalative deposit) to Yanshanian magmatic hydrothermal origins. Accurate dating on the mineralization and associated igneous rocks is a key to solve this problem. Using Rb-Sr isochron method on quartz (fluid inclusions) samples from the massive sulfide ore, an ore formation age of 161.8±9.6 Ma (MSDW=1.3) was obtained. Intrusive rocks (i.e., granodiorite-porphyry specially related to Cu ore-forming) in Dongxiang region was also studied. The zircon U-Pb ages are 164±2 Ma and 160±1 Ma for granodiorite porphyry. These results indicate that the metallogenic epoch of the Dongxiang copper deposit occurred in the Yanshanian. Combined with fluid inclusion results and regional metallogeny, it is proposed that the Dongxiang copper deposit was related to magmatic hydrothermal activities associated with the Yanshanian intrusive porphyries nearby.
- fluid inclusion /
- Rb-Sr isochron dating /
- geochronology /
- metallogenetic age /
- Dongxiang Cu deposit /
- ore deposits

HTML全文

图 1 赣东北区域地质及矿区地质简图

图a据杨明桂和梅勇文(1997)；图b据李培铮等(1999)；图c据张国林和何国朝(2002).1.钦杭结合带；2.深大断裂；3.一般断裂；4.倒转背斜；5.中生代火山岩；6.燕山期侵入岩；7.第四系；8.上白垩统南雄组；9.上石炭统壶天群；10.石炭系梓山组；11.上泥盆统-下石炭统中棚组；12.新元古界双桥山群；13.矿体平面投影位置

Fig. 1. Geological sketch of northeast Jiangxi Province and geological sketch of the Dongxiang copper deposit

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图 2 东乡铜矿矿石样品及流体包裹体照片

a.黄铁黄铜矿矿石，可见金属硫化物矿物之间石英，黄铁矿晶粒较大，碎裂现象明显(DT656)；b.黄铜矿，他形；c.成矿阶段石英中含子晶三相流体包裹体；d.富气相包裹体；e.富液相包裹体.Ccp.黄铜矿；Q.石英；Py.黄铁矿；S.子晶；L.液相；V.气相

Fig. 2. Photos of mineral in the Dongxiang copper deposit and fluid inclusions in the ore stage of quartz veins

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图 3 东乡铜矿区67线勘探线剖面采样点示意

1.白云质灰岩；2.细砂岩；3.花岗闪长斑岩；4.铜矿体；5.采样点.C_1-2z.下-上石炭统梓山组；C₂H.中石炭统壶天群；K₂n.上白垩纪南雄组

Fig. 3. Profile sketch of prospecting line 67 of Dongxiang copper deposit

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图 4 东乡铜矿矿石中石英流体包裹体中Rb-Sr同位素等时线

Fig. 4. Rb-Sr isotope data and isochron ages of fluid inclusion in quiz from Dongxiang mineral

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图 5 样品的锆石的CL图像

实线圆为年龄分析点

Fig. 5. CL images of zircon grains from Samples of Dongxiang

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图 6 花岗闪长斑岩的锆石²⁰⁷Pb/²³⁵U-²⁰⁶Pb/²³⁸U同位素年龄谐和图

样品DT050、DT086为花岗闪长斑岩

Fig. 6. The ²⁰⁷Pb/²³⁵U-²⁰⁶Pb/²³⁸U ages of zircon grains from granodiorite-porphyries and quartz porphyry

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表 1 东乡铜矿矿石中石英流体包裹体中Rb-Sr同位素组成

Table 1. Rb-Sr isotope data of fluid inclusion in quiz from Dongxiang mineral

样品	Rb(10^-6)	Sr(10^-6)	⁸⁷Rb/⁸⁶Sr	⁸⁷Sr/⁸⁶Sr	2σ
DT365	0.785 6	0.569 7	3.98	0.724 01	0.000 04
DT366-2	0.990 2	0.646 4	4.43	0.724 97	0.000 06
DT366-3	1.642 0	1.227 0	3.86	0.723 80	0.000 09
DT367	2.080 0	1.254 0	4.79	0.726 02	0.000 01
DT368	0.867 9	0.734 1	3.41	0.722 78	0.000 01

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表 2 东乡铜矿侵入岩LA-ICP-MS锆石分析结果

Table 2. Zircon LA-ICP-MS U-Pb results for intrusion of Dongxiang copper deposit

样品	Th	U	Th/U	同位素比值						同位素年龄(Ma)
样品	(10^-6)		Th/U	²⁰⁷Pb/²⁰⁶Pb	error	²⁰⁷Pb/²³⁵U	error	²⁰⁶Pb/²³⁸U	error	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ
DT050
1	381	436	0.87	0.053 89	0.001 44	0.189 02	0.004 97	0.025 47	0.000 33	366	62	176	4	162	2
2	870	789	1.10	0.052 61	0.001 16	0.184 32	0.004 10	0.025 44	0.000 33	312	51	172	4	162	2
3	567	434	1.31	0.051 80	0.001 97	0.182 74	0.006 75	0.025 63	0.000 40	277	89	170	6	163	3
4	666	579	1.15	0.057 50	0.001 85	0.202 11	0.006 35	0.025 52	0.000 36	511	72	187	5	162	2
5	536	499	1.07	0.048 93	0.001 52	0.170 76	0.005 17	0.025 34	0.000 35	144	74	160	4	161	2
6	1 139	877	1.30	0.050 78	0.001 61	0.179 62	0.005 67	0.025 67	0.000 40	231	75	168	5	163	3
7	635	521	1.22	0.051 27	0.002 36	0.182 15	0.008 25	0.025 78	0.000 42	253	108	170	7	164	3
9	705	734	0.96	0.052 32	0.001 31	0.189 67	0.004 76	0.026 30	0.000 37	299	58	176	4	167	2
12	553	527	1.05	0.049 15	0.001 33	0.172 24	0.004 67	0.025 42	0.000 36	155	65	161	4	162	2
14	927	532	1.74	0.046 46	0.001 24	0.166 57	0.004 44	0.026 01	0.000 36	22	56	156	4	166	2
15	3 572	1 146	3.12	0.053 33	0.001 14	0.195 11	0.004 25	0.026 54	0.000 36	343	50	181	4	169	2
16	713	954	0.75	0.056 27	0.001 47	0.199 42	0.005 24	0.025 71	0.000 39	463	59	185	4	164	2
17	1 180	830	1.42	0.048 95	0.001 10	0.179 41	0.004 06	0.026 59	0.000 36	145	54	168	3	169	2
18	449	353	1.27	0.071 76	0.001 88	0.256 01	0.006 60	0.025 88	0.000 37	979	55	231	5	165	2
DT086
1	238	223	1.06	0.046 53	0.001 58	0.161 37	0.005 43	0.025 15	0.000 38	25	72	152	5	160	2
2	540	489	1.10	0.049 68	0.001 57	0.170 22	0.005 33	0.024 85	0.000 39	180	75	160	5	158	2
3	563	439	1.28	0.048 00	0.001 41	0.170 27	0.005 08	0.025 73	0.000 42	99	68	160	4	164	3
4	441	341	1.30	0.049 61	0.001 32	0.170 99	0.004 61	0.025 00	0.000 38	177	64	160	4	159	2
6	242	229	1.06	0.047 83	0.001 27	0.167 63	0.004 45	0.02 542	0.000 36	91	62	157	4	162	2
7	327	250	1.31	0.058 74	0.001 97	0.204 44	0.006 77	0.025 24	0.000 42	557	75	189	6	161	3
8	623	425	1.47	0.049 01	0.001 12	0.155 44	0.003 55	0.023 00	0.000 30	148	55	147	3	147	2
9	171	146	1.17	0.049 63	0.004 37	0.172 06	0.014 70	0.025 15	0.000 72	178	200	161	13	160	5
10	447	292	1.53	0.048 97	0.001 51	0.170 63	0.005 26	0.025 27	0.000 40	146	74	160	5	161	3
12	867	867	1.00	0.048 69	0.001 06	0.168 61	0.003 74	0.025 12	0.000 35	133	52	158	3	160	2
13	808	635	1.27	0.049 28	0.000 98	0.171 37	0.003 53	0.025 23	0.000 34	161	48	161	3	161	2
14	701	732	0.96	0.049 01	0.000 88	0.218 98	0.004 25	0.032 41	0.000 47	148	43	201	4	206	3
16	363	906	0.40	0.051 06	0.001 56	0.178 35	0.005 27	0.025 35	0.000 36	244	72	167	5	161	2
17	889	740	1.20	0.048 67	0.001 07	0.167 30	0.003 79	0.024 94	0.000 36	132	53	157	3	159	2
18	256	289	0.89	0.049 51	0.001 46	0.191 45	0.005 67	0.028 05	0.000 43	172	70	178	5	178	3
19	376	246	1.53	0.050 52	0.001 64	0.173 70	0.005 54	0.024 94	0.000 38	219	77	163	5	159	2
20	670	453	1.48	0.048 80	0.003 18	0.169 21	0.010 74	0.025 16	0.000 62	138	147	159	9	160	4
21	297	249	1.19	0.049 42	0.001 88	0.170 79	0.006 34	0.025 07	0.000 40	168	90	160	5	160	3
22	298	300	0.99	0.045 77	0.002 90	0.165 22	0.010 22	0.026 17	0.000 63	-14	139	155	9	167	4
23	626	545	1.15	0.050 59	0.003 34	0.177 58	0.011 35	0.025 50	0.000 66	222	151	166	10	162	4
24	1092	663	1.65	0.048 96	0.001 25	0.174 51	0.004 49	0.025 87	0.000 39	146	61	163	4	165	2
25	247	252	0.98	0.051 99	0.001 39	0.176 55	0.004 75	0.024 65	0.000 37	285	63	165	4	157	2

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