东昆仑五龙沟金矿床Ⅲ矿段原生晕特征及模式

五龙沟金矿床Ⅲ矿段呈现以Au、As、Ag为主 ,伴有Pb、Zn、Cu、Bi、Sb等多元素的综合原生晕 ,其中Au、Ag、As为典型矿致异常元素组合 ,其次为Hg、Sb、Bi;Ag、As、Sb等元素为远程指示元素 ,也为矿体前缘晕和上部特征元素 ;Hg、Bi、Pb为矿体上部和中上部原生晕特征元素组合 ,也为中远程指示元素 ;Cu、Zn为矿体中部和中下部原生晕特征指示元素 ;Au在整个原生晕中均是特征直接指示元素 ;原生晕轴向分带序列为As-Sb-Ag-Bi-Pb-Hg-Au-Zn -Cu,横向分带序列为 ,矿体上部原生晕 :Au -Zn -Ag -Bi-As-Hg -Cu-Sb -Pb ;中下部原生晕 :Zn -Cu-Au -Ag -Hg-As-Pb -Sb -Bi。矿致原生晕特征为Au原生晕发育 ,平均强度大于 1 60× 1 9-9;原生晕组合复杂 ,Au、Ag、As、Sb、Hg、Bi、Zn原生晕连续性好 ,范围大于构造带 ,有内中外或外中浓度带 ,各指示元素原生晕吻合性好 ;一般在矿体 (带 )受中度剥蚀深度 (或矿体已露出 )断面上 ,Au -Ag和Au -As具正相关表现 ,相关性较好。这些特点或指标 ,可作为以蚀变岩型为主要类型金矿床的地球化学信息标志

PRIMARY DISPERSION HALO AND ITS MODEL IN Ⅲ ORE SEGMENT OF WULONGGOU GOLD DEPOSIT,EAST KUNLUN MOUNTAINS

There are compound primary halos of multiple elements, mainly Au, As, and Ag with Pb, Zn, Cu, Bi and Sb in Ore Segment Ⅲ of the Wulonggou gold deposit, in which Au, Ag, As are the typical ore-causing elements and Hg, Sb, Bi are less typical. Ag, As and Sb are long-range indication elements as well as the front halos and upper characteristic elements. Hg, Bi and Pb are the characteristic elements of primary halos in the upper and middle-upper parts of ore bodies and are the median to large-range indication elements. Cu and Zn are the typical indication elements of halos in the middle and median-lower parts of the ore bodies. Au is the typical directive indication element in whole primary halos. The axial zoning sequence of primary halos is As-Sb-Ag-Bi-Pb-Hg-Au-Zn-Cu. The cross zoning sequence of primary halos is Au-Zn-Ag-Bi-As-Hg-Cu-Sb-Pb in the upper parts of the ore bodies and Zn-Cu-Au-Ag-Hg-As-Pb-Sb-Bi in the median-lower parts of the ore bodies. The feature of ore-causing primary halos is that the primary halos of Au are very well developed, the mean intensity of which is larger than 160×19+{-9}. The assemblage of primary halos is complex. The continuity of the primary halos of Au, Ag, As, Sb, Hg, Bi and Zn is very good, the area of which is larger than the tectonic zone. Inner, middle and outer or outer and middle concentration zones can be distinguished in the primary halos.The primary halos of different indication elements well coincide with each other. Generally, Au-Ag and Au-As are positively correlated at the depth where ore bodies are moderately denudated or bared. All these can be used as the geochemical clues to the altered rock-type gold deposits.