延边小西南岔铜金矿床辉钼矿Re-Os同位素测年及其地质意义

任云生; 王辉; 屈文俊; 赵华雷; 褚广勤

doi:10.3799/dqkx.2011.072

延边小西南岔铜金矿床辉钼矿Re-Os同位素测年及其地质意义

doi: 10.3799/dqkx.2011.072

1.
吉林大学地球科学学院，吉林长春 130061
2.
国家地质实验测试中心，北京 100037
3.
珲春紫金矿业有限公司，吉林珲春 133300

基金项目:

中国地质调查局项目 1212010913026

中国地质调查局项目资[2010]矿评01-20-06

中国科学院地球化学研究所矿床地球化学国家重点实验室开放研究基金 200910

详细信息

作者简介:
任云生(1969-)，男，教授，主要从事热液矿床成矿理论与预测研究. E-mail: renys@jlu.edu.cn

中图分类号: P618.4;P597
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出版历程
- 收稿日期: 2010-10-28
- 刊出日期: 2011-07-01

Re-Os Isotopic Dating of Molybdenite from Xiaoxi'nancha Copper-Gold Deposit in the Yanbian Area and Its Geological Significance

1.
College of Earth Sciences, Jilin University, Changchun 130061, China
2.
National Research Center of Geoanalysis, Academy of Geological Sciences, Beijing 100037, China
3.
Hunchun Zijin Mining Industrial Co.Ltd., Hunchun 133300, China

摘要

摘要: 为确定小西南岔铜金矿床的成矿时代，对北山矿段新发现的含辉钼矿石英脉进行了系统研究和同位素测年.空间上，含辉钼矿石英脉与相邻铜金矿体平行，它们受相同的构造体系控制；钼矿石中金属矿物以辉钼矿为主，并明显被黄铜矿和黄铁矿沿裂隙、晶隙充填交代，根据不同矿物间的交生关系，结合前人研究资料认为，该辉钼矿石英脉是该区大规模铜金矿化的早期阶段产物.在此基础上，对6件辉钼矿样品进行了Re-Os同位素分析，获得的模式年龄为109.2±3.4 Ma~110.8±4.0 Ma，平均年龄为109.9±3.9 Ma，等时线年龄为111.1±3.1 Ma，与该区燕山晚期花岗岩类最新测年结果具明显的耦合关系，为小西南岔矿床提供了一个准确的形成时限.综合辉钼矿中低的Re含量、成矿岩体岩石学、地球化学特征以及精细的同位素年代学研究认为，该区大规模铜金矿化主要发生于燕山晚期，成矿构造环境为伊泽奈崎板块向古亚洲大陆边缘俯冲造成的岩石圈伸展背景下的活动陆缘环境，成岩成矿物质具深源特征，主要来自上地幔.
- Re-Os同位素定年 /
- 地质年代学 /
- 地球化学 /
- 辉钼矿 /
- 铜金矿床
Abstract: To obtain the exact metallogenic age of Xiaoxi'nancha copper-gold deposit, the quartz-molybdenite vein newly discovered in the Beishan ore block is studied and dated by Re-Os isotopic dating of molybdenite. The quartz-molybdenite vein is parallel to adjacent lode copper-gold ore bodies, which indicates that both are controlled by the common structure system. The dominant metal minerals in molybdenum ore is molybdenite which is occasionally cut by later pyrite and chalcopyrite. Due to the intergrowth of different metal minerals, the lode molybdenum mineralization in Xiaoxi'nancha deposit is clearly earlier than major copper-gold metallogenic stage. Accordingly, it can be concluded that the lode molybdenum mineralization belongs to early metallogenic stage of copper-gold mineralization. Six samples of molybdenite for Re-Os isotopic dating are analyzed. The model ages vary from 109.2±3.4 Ma to 110.8±4.0 Ma, average 109.9±3.9 Ma, and a good isochron age of 111.1±3.1 Ma. These results are consistent with new isotopic dating of granitic intrusions related to copper-gold mineralization in this deposit. It indicates that the large copper-gold mineralization took place in late Yanshanian periods and both the granites and copper-gold mineralization were generated under extensive active continental margin resulted from the obliquely subduction of Pacific Ocean slab. Moreover, petrological & geochemical characters, isotopic dating of ore-forming intrusions as well as low content of Re in molybdenite demonstrate that granitic intrusions and copper-gold mineralization were derived from deep source, mainly upper mantle.
- Re-Os isotopic dating /
- geochronology /
- geochemistry /
- molybdenite /
- copper-gold deposit

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图 1 延边小西南岔铜金矿区地质示意(左上角为矿床大地构造位置，据Zhang et al.(2004)修改)

Fig. 1. Geological sketch map of Xiaoxi'nancha deposit in Yanbian area

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图 2 小西南岔矿区北山矿段含辉钼矿石英脉剖面示意

Fig. 2. Section map of the lode molybdenum ore body in Beishan ore block of Xiaoxi'nancha mine

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图 3 小西南岔矿床石英脉型钼矿石中矿物交生关系显微照片

a.自形晶结构的辉钼矿集合体；b.沿辉钼矿裂隙分布的黄铁矿细脉；c.沿辉钼矿裂隙分布的黄铜矿；d.辉钼矿沿边缘及裂隙被黄铜矿充填交代；e.黄铜矿交代早阶段黄铁矿；f.黄铜矿沿石英晶隙分布.Qtz.石英；Py.黄铁矿；Ccp.黄铜矿；Mlb.辉钼矿

Fig. 3. Microphotograph showing intergrowth of minerals in lode molybdenite ore from Xiaoxi'nancha deposit

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图 4 延边小西南岔铜金矿中辉钼矿Re-Os同位素等时线

Fig. 4. Re-Os isotopic isochron diagram of molybdenites in the Xiaoxi'nancha deposit

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表 1 延边小西南岔铜金矿中辉钼矿Re-Os同位素分析结果

Table 1. Re-Os ICP-MS isotopic data of molybdenite in Xiaoxi'nancha gold-copper deposit

样品编号	样重(g)	Re(μg/g)		¹⁸⁷Re(μg/g)		¹⁸⁷Os(ng/g)		模式年龄(Ma)
样品编号	样重(g)	测定值	2δ	测定值	2δ	测定值	2δ	测定值	2δ
40	0.005 38	121.5	2.4	76.33	1.5	139.1	2.4	109.2	3.4
34	0.004 89	106.1	2.0	66.67	1.3	122.1	2.8	109.8	3.6
42	0.005 08	121.7	3.6	76.49	2.3	139.8	3.2	109.6	4.4
46	0.005 68	213.4	5.4	134.10	3.4	247.7	5.2	110.8	4.0
47	0.005 76	109.7	2.6	68.96	1.6	126.8	2.4	110.3	3.8
41	0.005 63	86.37	2.2	54.28	1.4	99.19	2.0	109.6	4.0
注：同位素数据在国家地质实验测试中心完成，仪器为电感耦合等离子体质谱仪(TJA X-series ICP-MS)；Re、Os含量的不确定度包括样品和稀释剂的称量误差、稀释剂的标定误差、质谱测量的分馏校正误差、待分析样品同位素比值测量误差，置信水平95%；模式年龄的不确定度还包括衰变常数的不确定度(1.02%)，置信水平为95%.

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