湖南下寒武统石煤中的镍钼铂族元素的地球化学特征

GEOCHEMISTRY CHARACTERISTICS OF Ni Mo Pt GROUP ELEMENTS IN THE LOWER CAMBRIAN BONE COAL IN HUNAN PROVINCE

从岩石学、矿床学、微量元素地球化学、稳定同位素方面对湖南下寒武统石煤中镍、钼、铂族元素为主的伴生元素的来源和富集成因进行了研究研究认为，含矿岩系中发育的硅岩是一种喷流岩；有海底喷流作用直接堆积的金属硫化物筒状富矿体；矿石中各种胶状结构发育；矿床具两套成矿系统；微量元素Ｓｅ，Ａｓ，Ｂａ高地壳丰度数倍至数万倍；矿层中硫同位素值为－１３００％～－１７６１％等证实了湖南下寒武统石煤中以镍、钼、铂族元素为主的伴生元素，其来源和富集并非陆源搬运沉积。

The source and origin of the associated elements,mainly Ni Mo Pt group elements in the Lower Cambrian bone coal in Hunan are discussed.The topic is studied by methods of petrology,mineralogy,geochemistry of trace elements and stable isotope.The author holds that the silica rock developed in the ore bearing rock is exhalite.There were tubular ore shoots of metal sulphide which were directly formed by sea floor exhalation.In the ore rocks all kinds of gel textures were developed.The ores have two sets of mineralization systems.The content of trace elements Se,As,Ba in ores is several to hundred of thousand of times,as abundance of earth crust.δ 34 (S) of ore layers ranged from -1 300% to -1 761%. The above characteristics elements(mainly Ni Mo Pt group elements) were closely related to sea floor exhalation and were not related to terrestrial transportation sedimentation in the Lower Cambrian bone coal in Hunan Province.