西秦岭寒武系层控金矿床中成矿元素富集规律

产于西秦岭南亚带寒武系硅岩建造中的金矿床， 是我国境内发现的一种与海底喷流作用有关的、具有独特地质特征的层控金矿床。成矿元素富集规律研究表明， 矿床中富集的元素种类十分丰富， 不仅含有具基性、超基性特征的元素群， 而且含有具酸性特征的元素群， 元素组合相当复杂。除Ａｕ 外， Ｃｕ、Ｕ、Ｍｏ、Ｓｂ、Ｖ、Ｚｎ等在局部地段亦可圈出独立的矿体。尤为重要的是， 矿床中铂族元素（ＰＧＥ）、分散元素（Ｓｅ、Ｉｎ） 的富集程度达到了综合利用的程度， 从而构成特殊的Ａｕ－Ｃｕ－Ｕ－Ｍｏ－Ｓｅ－ＰＧＥ建造矿床。

STUDY ON THE ENRICHING REGULARITY OF ORE FORMING ELEMENTS IN THE CAMBRIAN STRATABOUND GOLD DEPOSITS, WESTERN QINLING

The gold deposits,located in the Cambrian silicalite formation of western Qinling, are the new type stratabound gold deposit, closely associated with submarine exhalative sedimentation.There are many unique features.Through systematically studying on enriching regularity of ore forming elements,it indicates that the deposits are enriched in most elements, which are characterized by not only the basic and ultrabasic elements group (e.g. Au, Pt, Pd, Cu and Cr) but also the acid element group (e.g. W, U, Mo, etc.). Element paragensis is much complex. In addition to Au, independent Cu, Sb, U, Mo, Zn and Se orebodies could be delimited respectively in some parts. It is particularly interesting to note that there are abnormally high concentrations of platinum group elements (PGE) and rare elements (e.g. Se and In), which are locally enriched to the degree of industrial byproducts in some parts of deposits. With such a complex element paragenesis (Au Cu U Mo Se PGE), the gold deposits hosted in the Cambrian silicalite formation are really unusual as compared with others.