南岭成矿带中——晚侏罗世成钨、成锡、成铅锌(铜)花岗岩的差异性研究  

The petrogenetic differences of the Middle-Late Jurassic W-, Sn-, Pb-ZnCu-bearing granites in the Nanling Range, South China

作　　者：秦拯纬 付建明[1,2] 邢光福[1,2] 程顺波[1,2] 卢友月[1,2] 祝颖雪 QIN Zhengwei;FU Jianming;XING Guangfu;CHENG Shunbo;LU Youyue;ZHU Yingxue(Wuhan Center of Geological Survey,China Geological Survey,Wuhan 430205,Hubei,China;Research Center of Granitic Diagenesis and Mineralization,China Geological Survey,Wuhan 430205,Hubei,China;Freiburg University,Freiburg 79104,Germany;China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205 [2]中国地质调查局花岗岩成岩成矿地质研究中心,湖北武汉430205 [3]弗莱堡大学,弗莱堡79104 [4]中国地质大学,湖北武汉430074

出　　处：《中国地质》2022年第2期518-541,共24页Geology in China

基　　金：国家自然科学基金项目(41802069);湖北省自然科学基金项目(2019CFB634);中国地质调查局项目(DD20221689、DD20190154)联合资助。

摘　　要：【研究目的】南岭地区以发育强烈的中—晚侏罗世岩浆作用与相关金属成矿作用为主要特色,这些金属矿床尤以钨、锡、铅锌铜最具代表性。对这3类成矿花岗岩开展系统的对比研究,深入分析成矿差异原因,对指导区域找矿具有重要意义。【研究方法】本文通过搜集已发表的主量元素、微量元素、年代学、Sr-Nd-Hf同位素和矿物化学数据,并结合项目组长期野外地质调查进展,对3类成矿花岗岩进行了差异性研究。【研究结果】通过对比发现成钨、成锡、成铅锌铜3类花岗岩在时空分布格局、野外地质特征、矿物组成、源区性质、包体成因类型、岩浆分异程度、形成温度和氧逸度等方面具有明显的差异。【结论】笔者认为花岗岩的岩石地球化学成分、源区物质组成、岩浆分异程度以及岩浆演化过程中物化条件(如氧逸度)的综合差异是导致南岭花岗岩形成3类不同金属矿床的主要原因。在此基础上,进一步完善了南岭成矿带成钨、成锡、成铅锌铜花岗岩的综合判别标志,指导区域找矿勘查。This paper is the result of minerial exploration engineering.[Objective]The Nanling Range in southern China is characterized by extensive granitic magmatic activity and significant metal deposits during the Middle-Late Jurassic, with W, Sn and Pb-Zn-Cu as the most representative metallogenic categories. In this regard, a systematic comparison study on the three types of ore-bearing granites and a thorough analysis on the origin of mineralization differences would have great implications for regional prospecting. [Methods] In this contribution, the whole rock major and trace element concentrations as well as geochronological, Sr-Nd-Hf isotopical and mineral chemical data of these orebearing granites have been collected and reviewed to summarize their petrogenetic differences. [Results] In combination with our major progress in the long-term geological survey, we suggest that differences do exist among W-, Sn-and Pb-Zn-Cu-bearing granites in many aspects, including the spatial-temporal distribution of the metallic deposits and related granitic plutons, geological characteristics, mineral compositions, source nature, enclave origin, differentiation degree, formation temperatures and the oxygen fugacity as well. [Conclusions] It is concluded that the chemical component of granitic rocks, source materials, magmatic differentiation degree and physical-chemical environment during magma evolution are closely associated with the mineralization types(W, Sn, Pb-Zn-Cu) and control the processes of ore formation. Based on the above, the integrated classification criteria for the W-, Sn-and Pb-Zn-Cu-bearing granites from the Nanling Range has been improved, which would be helpful for ore prospecting in the region.

关 键 词：钨、锡、铅锌铜矿床 成矿花岗岩 中—晚侏罗世 岩石成因 矿产调查工程 南岭 

分 类 号：P618.4[天文地球—矿床学] P618.67[天文地球—地质学]