胶东大型金矿床的地球化学分带特征

胶东地区大型、特大型金矿都严格受构造控制，具有多期多阶段叠加成晕特点，一般都有1~2个主成矿阶段.在矿体周围能形成异常的元素有Au、Ag、Cu、Pb、Zn、As、Sb、Bi、Mo、Hg、Co、Mn、Ni、W（F、B）等元素.单阶段形成的晕具有明显的垂直分带，Hg、As、Sb（B、F）强异常总是分布在矿体上部及前缘，而Bi、Mo、Mn、Co、Ni的强异常总是分布于矿体下部及尾晕，Au、Ag一般正相关，Cu、Pb、Zn有时偏于矿体上部，有时偏于下部.典型金矿床的元素组合及矿床地球化学异常垂直分带特征是研究金矿床原生叠加晕叠加结构、建立矿床叠加晕模型、确定盲矿体预测的重要标志.

CHARACTERISTICS OF GEOCHEMICAL ZONING IN LARGE AND RICH GOLD DEPOSITS IN SHANDONG PROVICE

East Shandong,where the most number of large and super large gold deposits are concentrated,is the most important area for gold deposits in China The deposits are strictly controlled by structural systems They are characterized by multi period and multi stage superimposed halos,commonly with one or two major mineralozation stages Around the ore bodies,the elements that can form anomaly are Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Mo,Hg,Co,Mn,Ni,W ets The halos formed in single stage are with obvious vertical zonation,i e ,the strong anomaly of Hg,As,Sb(B or F)are always distributed at the top and front of ore body,while the strong anomaly of Bi,Mo,Mn,Co and Ni are at the bottom of ore body or rear halo Au and Ag are positively correlated Cu,Pb and Zn exist at the upper part or lower part of ore bodies The characteristics of element association and geochemical anomaly zonation of typical deposits are significant to study the superimposition of primary halo of gold deposits,to establish superimposed halo model of deposits,and to predict blind ore bodies