东昆仑东段洪水川群地质特征及含矿性分析

Geologic characteristics and Ore-Containing of Hongshuichuan Group, East section of eastern Kunlun

东昆仑东段下三叠统洪水川群,地质特征复杂,其自下而上可分为砂砾岩组、火山碎屑岩组和碳酸盐岩组三个岩组。洪水川群火山岩属于钙碱性系列的中酸性火山岩。洪水川群地层是良好的含矿层位,有较高的Au丰度,B、Ni、V、Ti、Co、Cr、As、Cu、W、Pb、Zn、Ag等元素亦有高背景值,洪水川群具备有利的成矿背景,可形成与钙碱性系列的中酸性火山岩成矿密切相关的Au、Ag、Cu、Pb、Zn、Co等矿床。

Hongshuichuan Group of the Lower Triassic is widely distributed in the east section of eastern Kunlun. With the complicated geological characteristics, this group can be divided into three rock formations from bottom to top: glutenite formation, pyroclastic rock formation and carbonate rock formation. The volcanic rocks of Hongshuichuan Group belong to medium- acidic volcanic rocks of calc- alkaline series.Besides, Hongshuichuan Group is a favorable ore- hosting horizon with a high abundance of Au, while there also exist high background values of B, Ni, V, Ti, Co, Cr, As, Cu, W, Pb, Zn, Ag and other elements. Taking all these above into account, Hongshuichuan Group has a favorable ore- forming background, and can form deposits of Au, Ag, Cu, Pb, Zn, Co and other elements, which are closely related to medium- acidic volcanic rocks of calc- alkaline series.