华南下寒武统镍钼矿层中铜铅锌矿物的发现及意义

华南扬子地块是我国古热水沉积成矿作用最为发育的地区之一,其热水沉积特性最早引起我国学者的关注。华南下寒武统黑色岩系中赋存多个与热水沉积成矿作用相关的大型、超大型重晶石矿床与N i-Mo-U-V多金属富集层。进一步研究分布在华南扬子地块黑色岩系中的金属、非金属矿床成因及其地球化学特征,对认识华南乃至全球晚震旦—早寒武世生物与环境演化有着十分重要的意义。本文对华南下寒武统镍-钼富集层矿石进行电子探针研究,识别出黄铜矿、黝铜矿等铜的独立矿物;闪锌矿等锌的独立矿物;方铅矿、白铅矿等铅的独立矿物。研究表明,在镍-钼矿石中这些矿物的发现为镍-钼矿层是热水沉积作用产物提供了直接的矿物学证据。

The Discover and Genetic Signification of Cu, Pb, Zn Minerals in Ni-Mo Sulfide Layer of the Lower Cambrian, South China

South China Yangtze block had firstly attracted the attention of the scholars in China with its well developed submarine hydrothermal exhalative mineralization feature.Low Cambrian black rock series contain several large or super-large barite deposits and Ni-Mo-U-V-enriched layers which were all related to the submarine hydrothermal exhalative genesis in the South China.To furtherly study the cause of formation and the geochemical character of metal and nonmetal deposits which distribute in black shales of South China Yangtze block.It will be great significance for a better understanding of the biologic and the environment evolution of late Sinian to early Cambrian in south China and even the globe.In this paper,several copper,lead and zinc minerals such as chalcopyrite,Tetrahedrite,spharite,galena were detected from the Ni-Mo ore of the Lower Cambrian Ni\\Mo sulfide layers in the South China based on electron microprobe analysis.Copper,lead and zinc minerals occured in nickel and molybdenum ores,which provides the direct evidence that the Ni-Mo layer was formed by submarine hydrothermal exhalative origin.