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柴北缘青龙沟金矿床闪长玢岩锆石年代学、黄铁矿原位硫同位素和微量元素特征及找矿启示
- 俞军真|郑有业|王永才|王建国|马波|贾翠霞|张琳琳
- 作者单位：
- 镍钴共伴生资源开发与综合利用全国重点实验室&金川镍钴研究设计院|中国地质大学（武汉）资源学院|金川镍钴研究设计院|青海大学地质工程学院|镍钴共伴生资源开发与综合利用全国重点实验室&金川镍钴研究设计院|镍钴共伴生资源开发与综合利用全国重点实验室&金川镍钴研究设计院|镍钴共伴生资源开发与综合利用全国重点实验室&金川镍钴研究设计院
基金项目：
- 国家自然科学基金项目(42164007)；镍钴共伴生资源开发与综合利用全国重点实验室项目(JKDGNZ26Z202406)；甘肃省自然科学基金项目（24JRRC001）
详细信息：
- 作者简介：
- 俞军真（1985—），男，工程师，从事成矿预测、资源勘查与评价工作；E-mail:yujunzhen@hotmail.com
- 通讯作者：
- 王建国(1972—)，男，副教授，博士，从事成矿预测、资源勘查、地球物理及矿山安全等方面的研究工作；E-mail：lywjg467047@126.com
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Zircon geochronology,in-situ sulfur isotopes,and trace elements of pyrite in diorite porphyrite of Qinglonggou Gold Deposit,Northern Margin of Qaidam,and its implications for prospecting
- English Author：
- State Key Laboratory of Ni & Co Associated Minerals Resources Development and Comprehensive Utilization&Jinchuan Nickel & Cobalt Research and Engineering Institute|School of Resources,China University of Geosciences (Wuhan)|Jinchuan Nickel & Cobalt Research and Engineering Institute|School of Geological Engineering,Qinghai University|State Key Laboratory of Ni & Co Associated Minerals Resources Development and Comprehensive Utilization&Jinchuan Nickel & Cobalt Research and Engineering Institute|State Key Laboratory of Ni & Co Associated Minerals Resources Development and Comprehensive Utilization&Jinchuan Nickel & Cobalt Research and Engineering Institute|State Key Laboratory of Ni & Co Associated Minerals Resources Development and Comprehensive Utilization&Jinchuan Nickel & Cobalt Research and Engineering Institute
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
青龙沟金矿床是柴北缘滩间山金矿田内重要的金矿床之一，矿体主要分布在中元古代万洞沟群含碳白云质大理岩中，其次为侵入地层的闪长玢岩中。但是，一直以来闪长玢岩年代学、源区及金成矿物质来源、金含量变化特征等问题没有得到很好的解决，在一定程度上制约了矿床成矿?饔眉巴馕д铱罂辈檠芯俊Ｑ∪∏嗔到鹂蟠埠鹕脸ょ阊遥肔A-ICP-MS对锆石U-Pb年代学和黄铁矿原位硫同位素、微量元素展开研究。研究成果表明：闪长玢岩形成时代为早二叠世（293.0 Ma±1.8 Ma），锆石εHf(t)值为-3.5~ 4.8，两阶段模式年龄TDM2为912 ~ 1 375 Ma，源区物质来自中元古代中下地壳，并有幔源物质参与。闪长玢岩中黄铁矿具有低δ34S值、低Au含量、高As含量和高w(Co)/w(Ni)值（δ34S=4.01 ‰~4.58 ‰；w(Au)=0.10×10-6～0.49×10-6，平均值0.26×10-6；w(As)=404.61×10-6～9 546.27×10-6，平均值5 779.62×10-6；w(Co)/w(Ni)=3.86～97.37），明显区别于赋矿含碳白云质大理岩中黄铁矿δ34S值、Au含量、As含量和w(Co)/w(Ni)值（δ34S=8.4 ‰~15.8 ‰，w(Au)=1.92×10-6~30.28×10-6，w(As)=9 029.20×10-6~130 727.48×10-6，w(Co)/w(Ni)=0.11~0.38），表明金成矿物质可能源自早二叠世深部岩浆挥发分或地幔脱气作用，黄铁矿金含量低，对矿床成矿贡献较小，矿床深边部及外围找矿方向仍应以万洞沟群含碳白云质大理岩为主，其次为岩浆岩。
关键词:
柴北缘；滩间山；青龙沟金矿床；闪长玢岩；黄铁矿；成矿物质来源；找矿
Abstract:
Qinglonggou Gold Deposit is a significant gold deposit in Tanjianshan Goldfield,northern margin of Qaidam.The ore bodies are mainly hosted in Mesoproterozoic carbon-bearing dolomitic marble of the Wandonggou Group,with some found in intrusive diorite porphyrite.However,the diorite porphyrite’s chronology,source,origin of gold-bearing materials,and gold content variation have not been adequately addressed,limiting the understanding of mineralization and the potential for further exploration.Zircon U-Pb geochronology and sulfur isotopes and trace elements in pyrite from gold-bearing diorite porphyrite were analyzed using LA ICP MS.The findings reveal that the diorite porphyrite formed in the Early Permian (293.0 Ma±1.8 Ma),with zircon εHf(t) values ranging from -3.5 to 4.8 and a two-stage model age (TDM2) between 912 and 1 375 Ma,indicating material from the Mesoproterozoic middle-lower crust with mantle contributions.Pyrite in the diorite porphyrite exhibits low δ34S values,low Au content,high As content,and elevated w(Co)/w(Ni) ratios （δ34S=4.01 ‰-4.58 ‰；w(Au)=0.10×10-6-0.49 ×10-6，averaging 0.26×10-6；w(As)=404.61×10-6-9 546.27×10-6，averaging 5 779.62×10-6；w(Co)/w(Ni)=3.86-97.37）,differing significantly from the δ34S,Au content,As content,and w(Co)/w(Ni) values of pyrite in the carbon-bearing dolomitic marble host rock （δ34S=8.4 ‰-15.8 ‰,w(Au)=1.92×10-6-30.28×10-6,w(As)=9 029.20×10-6-130 727.48×10-6,w(Co)/w(Ni)=0.11-0.38）.This suggests that gold mineralization likely originated from deep-seated Early Permian magma or mantle degassing.The low gold content in pyrite suggests a limited contribution to mineralization,with exploration efforts focusing primarily on gold bodies within carbon-bearing dolomitic marble,followed by magmatic rocks.
Keywords:
northern margin of Qaidam;Tanjianshan;Qinglonggou Gold Deposit;diorite porphyrite;pyrite;source of mineralizing materials;prospecting
