汉南杂岩余家山铜镍矿成矿时代与岩浆源区性质研究——来自锆石U-Pb测年和Lu-Hf同位素的制约

郑光高; 崔建军; 刘晓春; 乔建新; 曲玮; 陈龙耀; 李淼; 赵文平; 李东东

汉南杂岩余家山铜镍矿成矿时代与岩浆源区性质研究——来自锆石U-Pb测年和Lu-Hf同位素的制约

1.
中国地质科学院地质力学研究所, 北京 100081
2.
北京大学地球与空间科学学院, 北京 100871
3.
陕西矿业开发工贸公司, 陕西西安 710054
4.
陕西省地质矿产勘查开发总公司第二分公司, 陕西汉中 723000

基金项目:

中国地质科学院地质力学研究所基本科研经费 DZLXJK201302

陕西省矿产资源勘查与综合利用重点实验室基金地合字201401

中国地质调查局地质调查项目 121201104000160916

详细信息

作者简介:
郑光高(1987-), 男, 博士, 岩石学专业, 从事岩石大地构造学研究。E-mail:tiangang755@163.com

中图分类号: P618.41;P618.63
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出版历程
- 收稿日期: 2017-03-06
- 刊出日期: 2017-10-01

METALLOGENIC AGES AND THE NATURE OF MAGMA SOURCE OF THE YUJIASHAN CU-NI DEPOSIT, HANNAN COMPLEX:CONSTRAINTS FROM ZIRCON U-PB DATING AND LU-HF ISOTOPE

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
School of Earth and Space Sciences, Peking University, Beijing 100871, China
3.
Shannxi Mining Industry & Trade Company, Xi'an 710054, Shaanxi, China
4.
The Second Branch Company, Shaanxi Geological and Mineral Survey and Development Corporation, Hanzhong 723000, Shaanxi, China

摘要

摘要: 汉南杂岩余家山铜镍矿位于望江山基性岩体的西南部，地处扬子克拉通北缘西端。矿区内出露的岩体成岩成矿时代和源区性质不明，从而影响了对本矿床成因的认识。本文分析了矿区内出露的典型含矿岩体和围岩的LA-ICP-MS锆石U-Pb年代学和原位Lu-Hf同位素数据，结果表明其成矿时代接近或稍晚于约（791±4）Ma，成岩时代约为（808±7）Ma。且含矿岩体的ε_Hf（t）值在+9.5~+10.9之间，平均值为+10.7，一阶段Hf模式年龄为924~974 Ma；围岩的ε_Hf（t）值在+8.7~+11.1之间，平均值为+9.9，一阶段Hf模式年龄为927~1018 Ma。结合前人研究成果表明，余家山铜镍矿基性岩体由中元古代晚期至新元古代早期亏损地幔物质部分熔融生成，可能形成于活动大陆边缘环境。
- 汉南杂岩 /
- 余家山铜镍矿 /
- 望江山基性岩体 /
- 锆石U-Pb年代学 /
- 锆石Lu-Hf同位素
Abstract: The Yujiashan Cu-Ni deposit of Hannan complex is located in the southwest of the Wangjiangshan basic massif, in the west of the northern margin of the Yangtze craton. There is less study on the diagenesis age, mineralization age and the nature of magma source of the outcropped rock mass, which affects the understanding of the deposit genesis. The data of LA-ICP-MS zircon U-Pb dating and in-situ Lu-Hf isotope of the typical outcropped ore-bearing and surrounding rocks were analyzed in the study. The results show that the mineralization age is about or a little late than (791±4) Ma, and the diagenesis age is about (808±6.8) Ma. Furthermore, the in-stiu zircon Hf isotopic analysis indicates that the ε_Hf(t) values of ore-bearing rock range from +9.5~+10.9, with an average value of +10.7 and Hf model ages ranging from 924 Ma to 974 Ma; the ε_Hf(t) values of surrounding rock range from +8.7~+11.1, with an average value of +9.9 and Hf model ages ranging from 924 Ma~974 Ma. Coupled with the available published data, it is proposed that the basic massif of the Yujiashan Cu-Ni deposit maybe derived from the partial melting of depleted mantle materials of late Middle Proterozoic-Neoproterozoic age in the active continental margins setting.
- Hannan complex /
- the Yujiashan Cu-Ni deposit /
- Wangjiangshan basic massif /
- zircon U-Pb dating /
- zircon Lu-Hf isotope

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图 1 汉南地区构造纲要图及研究区位置图

(据文献[13]修改)

Figure 1. Structural outline map and location map of the study area in Hannan region

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图 2 汉南地区余家山铜镍矿区地质简图

Figure 2. Geological sketch of the Yujiashan copper-nickel deposit in Hannan region

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图 3 汉南地区余家山铜镍矿野外产状照片

a－辉长岩中浸染型铜镍矿化现象； b、c－铜镍硫化物矿脉穿切浅色花岗质脉体； d－变形、蚀变现象

Figure 3. Field Occurrence photos of the Yujiashan nickel-copper deposit in Hannan region

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图 4 汉南地区余家山铜镍矿典型样品显微结构照片(单偏光(﹣)和正交偏光(+))

Hy－紫苏辉石；Cpx－单斜辉石；Am－角闪石；PI－斜长石；Op—金属矿物

Figure 4. Microstructure photographs of typical samples from the Yujiashan nickel-copper deposit in Hannan region

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图 5 汉南地区余家山铜镍矿锆石阴极发光图像和锆石U-Pb年龄谐和图

Figure 5. Cathodeluminescence images and U-Pb concordia diagram of zircons from the Yujiashan nickel-copper deposit in Hannan region

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图 6 汉南地区余家山铜镍矿锆石ε_Hf(t)－t图解

Figure 6. Zircon ε_Hf(t) values versus t(Ma) diagram from the Yujiashan nickel-copper deposit in Hannan region

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表 1 余家山铜镍矿LA-ICP-MS锆石U-Pb年代学测试结果

Table 1. LA-ICP-MS zircon U-Pb dating results of the Yujiashan nickel-copper deposit

样品点号	Pb	Th	U	Th/U	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	²⁰⁷Pb/²⁰⁶Pb	1σ	²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	谐和度
样品点号	ppm			Th/U	同位素比值						年龄/Ma						谐和度
HN145-3-1	31.2	267	155	1.72	0.0679	0.0020	1.2403	0.0348	0.1326	0.0019	877.8	61.1	819.0	15.8	802.9	10.8	98%
HN145-3-2	54.7	274	324	0.85	0.0673	0.0016	1.2403	0.0285	0.1337	0.0017	855.6	48.1	819.0	12.9	808.7	9.5	98%
HN145-3-3	42.8	296	238	1.24	0.0670	0.0015	1.2031	0.0254	0.1306	0.0018	838.9	47.1	802.0	11.7	791.4	10.2	98%
HN145-3-4	58.9	532	292	1.82	0.0694	0.0018	1.2613	0.0300	0.1321	0.0017	922.2	53.7	828.5	13.5	799.7	9.6	96%
HN145-3-5	48.5	250	284	0.88	0.0674	0.0018	1.2381	0.0313	0.1330	0.0016	851.5	54.8	818.0	14.2	805.2	8.9	98%
HN145-3-6	22.0	112	136	0.82	0.0671	0.0024	1.1921	0.0394	0.1303	0.0021	842.6	74.8	796.9	18.2	789.7	12.1	99%
HN145-3-7	41.3	299	225	1.33	0.0665	0.0018	1.2065	0.0332	0.1313	0.0018	821.9	55.6	803.6	15.3	795.3	10.2	98%
HN145-3-8	16.8	86	103	0.83	0.0665	0.0026	1.1647	0.0399	0.1293	0.0022	821.9	81.5	784.1	18.7	783.7	12.7	99%
HN145-3-9	33.3	196	195	1.00	0.0661	0.0018	1.1762	0.0309	0.1295	0.0018	809.3	58.2	789.5	14.4	784.7	10.3	99%
HN145-3-10	42.5	314	230	1.36	0.0678	0.0016	1.2070	0.0276	0.1292	0.0014	861.1	50.8	803.8	12.7	783.4	8.3	97%
HN145-3-11	30.5	187	175	1.07	0.0688	0.0021	1.2503	0.0388	0.1321	0.0019	894.4	69.4	823.5	17.5	799.6	10.9	97%
HN145-3-12	34.7	189	207	0.91	0.0660	0.0020	1.1816	0.0340	0.1300	0.0016	805.6	67.6	792.0	15.8	788.1	9.4	99%
HN145-3-13	53.6	344	305	1.13	0.0653	0.0015	1.1604	0.0247	0.1288	0.0014	783.3	42.4	782.2	11.6	780.8	7.8	99%
HN145-3-14	188.1	1330	1019	1.30	0.0674	0.0012	1.2230	0.0210	0.1311	0.0014	851.5	35.2	811.1	9.6	794.1	7.9	97%
HN145-3-15	20.3	134	116	1.16	0.0671	0.0022	1.2077	0.0400	0.1305	0.0019	842.6	68.5	804.1	18.4	790.8	11.0	98%
HN145-3-16	28.5	171	167	1.03	0.0673	0.0020	1.2024	0.0349	0.1289	0.0017	855.6	60.8	801.7	16.1	781.5	9.5	97%
HN145-3-17	25.9	177	146	1.21	0.0662	0.0023	1.1758	0.0410	0.1285	0.0017	813.0	69.4	789.3	19.1	779.5	9.9	98%
HN145-3-18	59.5	367	349	1.05	0.0657	0.0015	1.1714	0.0238	0.1290	0.0016	798.2	52.8	787.3	11.1	782.4	9.1	99%
HN145-3-19	33.4	231	188	1.23	0.0664	0.0020	1.1923	0.0338	0.1302	0.0019	820.4	64.8	797.0	15.6	788.9	10.8	98%
HN145-3-20	39.9	271	228	1.19	0.0660	0.0018	1.1835	0.0313	0.1292	0.0017	805.6	59.3	793.0	14.6	783.5	9.5	98%
HN145-11-01	48.5	150	165	0.91	0.0660	0.0033	1.2098	0.0488	0.1329	0.0023	806.8	99.97	805.1	22.4	804.6	13.3	99%
HN145-11-02	39.3	118	145	0.81	0.0689	0.0036	1.2718	0.0558	0.1338	0.0025	896.8	104.42	833.2	24.92	809.6	14.1	97%
HN145-11-03	31.3	98	116	0.84	0.0665	0.0036	1.2191	0.0554	0.1329	0.0025	822.9	108.33	809.4	25.35	804.5	14.1	99%
HN145-11-04	51.5	153	189	0.81	0.0687	0.0032	1.2573	0.0459	0.1328	0.0023	889.5	92.76	826.7	20.66	803.6	13.0	97%
HN145-11-05	23.1	62	99	0.62	0.0699	0.0042	1.2895	0.0671	0.1339	0.0027	924	117.69	841.1	29.74	810.1	15.4	96%
HN145-11-06	29.3	76	141	0.54	0.0681	0.0035	1.2552	0.0542	0.1337	0.0024	871.5	103.79	825.7	24.4	808.9	13.9	98%
HN145-11-07	37.4	118	140	0.84	0.0685	0.0036	1.2645	0.0552	0.1339	0.0025	884	104.13	829.9	24.77	810	14.2	98%
HN145-11-08	27.4	81	106	0.77	0.0693	0.0041	1.2810	0.0653	0.1341	0.0027	907.4	116.37	837.3	29.09	811.2	15.3	97%
HN145-11-09	28.0	80	115	0.69	0.0665	0.0039	1.2298	0.0636	0.1342	0.0027	821.9	119.09	814.3	28.95	811.6	15.3	100%
HN145-11-10	24.4	66	106	0.62	0.0698	0.0079	1.2837	0.1384	0.1335	0.0048	921.4	215.89	838.5	61.55	807.6	27.0	96%
HN145-11-11	49.3	165	163	1.01	0.0668	0.0034	1.2242	0.0520	0.1329	0.0024	831.6	103.34	811.7	23.74	804.5	13.7	99%
HN145-11-12	58.6	166	242	0.69	0.0673	0.0031	1.2341	0.0437	0.1330	0.0022	847.1	91.71	816.2	19.84	805	12.7	99%
HN145-11-13	24.9	67	106	0.63	0.0687	0.0056	1.3541	0.1018	0.1431	0.0038	888.5	158.86	869.3	43.91	861.9	21.2	99%
HN145-11-14	20.3	49	83	0.59	0.0748	0.0047	1.3779	0.0766	0.1337	0.0029	1061.9	121.57	879.6	32.71	809	16.2	92%
HN145-11-15	35.8	92	178	0.52	0.0662	0.0034	1.2284	0.0511	0.1345	0.0024	813.6	102.29	813.6	23.3	813.7	13.7	100%
HN145-11-16	19.2	56	87	0.64	0.0630	0.0060	1.1894	0.1074	0.1370	0.0039	706.7	190.81	795.7	49.81	827.9	22.0	104%
HN145-11-17	27.6	81	112	0.73	0.0665	0.0044	1.2214	0.0727	0.1333	0.0029	821	132.87	810.4	33.23	806.7	16.5	100%
HN145-11-18	32.6	107	120	0.89	0.0683	0.0038	1.2593	0.0608	0.1338	0.0025	876.6	112.38	827.6	27.33	809.5	14.4	98%
HN145-11-19	21.4	59	89	0.66	0.0663	0.0043	1.2229	0.0709	0.1338	0.0028	815.7	130.24	811.1	32.4	809.5	15.9	100%
HN145-11-20	46.3	149	158	0.94	0.0690	0.0035	1.2738	0.0534	0.1340	0.0024	897.8	101.51	834.1	23.84	810.5	13.6	97%

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表 2 余家山铜镍矿锆石Lu-Hf同位素组成

Table 2. Zircon Lu-Hf isotopic composition from the Yujiashan nickel-copper deposit

测点号	Age/Ma	¹⁷⁶Yb/¹⁷⁷Hf	¹⁷⁶Lu/¹⁷⁷Hf	¹⁷⁶Hf/¹⁷⁷Hf	2σ	ε_Hf(0)	ε_Hf(t)	t_DM1/Ma	t_DM2/Ma	f_Lu/Hf
HN145-3-1	802.9	0.035803	0.000989	0.282574	0.000032	-7.0	10.2	959	1053	-0.97
HN145-3-2	808.7	0.021066	0.000835	0.282586	0.000019	-6.6	10.9	938	1018	-0.97
HN145-3-3	791.4	0.033041	0.001106	0.282578	0.000029	-6.9	10.0	957	1055	-0.97
HN145-3-4	799.7	0.012552	0.000452	0.282557	0.000023	-7.6	9.8	969	1075	-0.99
HN145-3-5	805.2	0.008886	0.000321	0.282572	0.000027	-7.1	10.6	945	1033	-0.99
HN145-3-6	789.7	0.013889	0.000501	0.282557	0.000025	-7.6	9.6	970	1083	-0.98
HN145-3-7	795.3	0.012072	0.000346	0.282568	0.000023	-7.2	10.2	952	1050	-0.99
HN145-3-8	783.7	0.022368	0.000842	0.282566	0.000023	-7.3	9.6	967	1078	-0.97
HN145-3-9	784.7	0.013221	0.000447	0.282572	0.000022	-7.1	10.0	949	1052	-0.99
HN145-3-10	783.4	0.031703	0.001069	0.282600	0.000023	-6.1	10.7	924	1008	-0.97
HN145-3-11	799.6	0.015805	0.000579	0.282579	0.000023	-6.8	10.5	942	1031	-0.98
HN145-3-12	788.1	0.019114	0.000675	0.282558	0.000021	-7.6	9.5	974	1088	-0.98
HN145-3-13	780.8	0.029298	0.000994	0.282597	0.000022	-6.2	10.6	927	1015	-0.97
HN145-3-14	794.1	0.032476	0.001249	0.282578	0.000028	-6.9	10.0	960	1058	-0.96
HN145-3-15	790.8	0.022605	0.000826	0.282564	0.000026	-7.4	9.7	969	1077	-0.98
HN145-3-16	781.5	0.017842	0.000696	0.282577	0.000029	-6.9	10.0	948	1050	-0.98
HN145-3-17	779.5	0.029740	0.001082	0.282593	0.000026	-6.3	10.3	935	1028	-0.97
HN145-3-18	782.4	0.037648	0.001345	0.282598	0.000022	-6.2	10.4	935	1024	-0.96
HN145-3-19	788.9	0.044190	0.001455	0.282595	0.000027	-6.2	10.4	941	1029	-0.96
HN145-3-20	783.5	0.038055	0.001368	0.282595	0.000025	-6.3	10.3	939	1031	-0.96
HN145-11-1	804.6	0.016663	0.000728	0.282527	0.000027	-8.7	8.7	1018	1149	-0.98
HN145-11-2	809.6	0.026208	0.001040	0.282565	0.000025	-7.3	10.0	973	1071	-0.97
HN145-11-3	804.5	0.018955	0.000780	0.282564	0.000025	-7.4	10.0	968	1068	-0.98
HN145-11-4	803.6	0.014788	0.000642	0.282556	0.000028	-7.6	9.8	975	1081	-0.98
HN145-11-5	810.1	0.015933	0.000711	0.282562	0.000028	-7.4	10.1	969	1066	-0.98
HN145-11-6	808.9	0.017269	0.000777	0.282556	0.000023	-7.6	9.8	979	1083	-0.98
HN145-11-7	810	0.017751	0.000787	0.282572	0.000024	-7.1	10.4	957	1047	-0.98
HN145-11-8	811.2	0.020999	0.000879	0.282554	0.000021	-7.7	9.8	984	1089	-0.97
HN145-11-9	811.6	0.013807	0.000611	0.282535	0.000027	-8.4	9.2	1004	1123	-0.98
HN145-11-11	804.5	0.025776	0.001024	0.282574	0.000021	-7.0	10.3	959	1053	-0.97
HN145-11-12	805	0.023812	0.001152	0.282557	0.000028	-7.6	9.6	988	1096	-0.97
HN145-11-14	809	0.011868	0.000519	0.282589	0.000027	-6.5	11.1	927	1001	-0.98
HN145-11-15	813.7	0.022469	0.001008	0.282548	0.000025	-7.9	9.5	996	1105	-0.97
HN145-11-17	806.7	0.014377	0.000674	0.282568	0.000025	-7.2	10.3	960	1054	-0.98
HN145-11-18	809.5	0.019634	0.000831	0.282555	0.000027	-7.7	9.8	982	1087	-0.97
HN145-11-19	809.5	0.011156	0.000466	0.282567	0.000022	-7.2	10.4	955	1046	-0.99
HN145-11-20	810.5	0.018883	0.000787	0.282550	0.000024	-7.9	9.6	988	1097	-0.98
注：ε_Hf(0)=[(¹⁷⁶Hf/¹⁷⁷Hf)_S/(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-1]×10⁴；ε_Hf(t)={[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_S×(e^λt-1)]/[(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR×(e^λt-1)]-1}×10⁴；T_DM1=1/λ×In{1+[(¹⁷⁶Hf/¹⁷⁷Hf)_S-(¹⁷⁶Hf/¹⁷⁷Hf)_DM]/[(¹⁷⁶Lu/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_DM]}；t_DM2=t_DM1-(t_DM1-t)×[(f_cc-f_s)/(f_cc-f_DM)]；f_Lu/Hf=(¹⁷⁶Lu/¹⁷⁷Hf)_S-(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR-1；其中：(¹⁷⁶Lu/¹⁷⁷Hf)_S和(¹⁷⁶Hf/¹⁷⁷Hf)_S为样品测量值，t为锆石结晶年龄，(¹⁷⁶Hf/¹⁷⁷Hf)_{CHUR, 0}=0.282772，(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR=0.0332，(¹⁷⁶Hf/¹⁷⁷Hf)_DM=0.28325，(¹⁷⁶Lu/¹⁷⁷Hf)_DM=0.0384^{[45, 47]}，λ=1.867×10^-11a^-1^[48]，(¹⁷⁶Lu/¹⁷⁷Hf)_C=0.015，f_cc=[(¹⁷⁶Lu/¹⁷⁷Hf)_C/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR]-1，f_s=f_Lu/Hf，f_DM=[(¹⁷⁶Lu/¹⁷⁷Hf)_DM/(¹⁷⁶Lu/¹⁷⁷Hf)_CHUR]-1

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