从桂西地区金砷汞锑元素的区域分布探讨金的物质来源

DISCUSSION ON SOURCE OF GOLD BASED ON REGIONAL DISTRIBUTION OF GOLD ARSENIC ANTIMONY AND MERCERY IN WESTERN GUANGXI

文章分析对比了桂西地区Ａｕ、Ａｓ、Ｈｇ、Ｓｂ元素的时空区域分布，并经与岩石样对比，发现上古生界以碳酸盐岩为主的地层为高背景，三叠系为低背景，Ａｕ的高背景区呈ＮＷ向展布，这与右江裂谷区地壳演化的独特历史有关。桂西地区上古生界金主要来自深源，三叠系碎屑岩中金主要来自陆源。从Ａｕ元素丰度与存在形式考虑，高背景的碳酸盐岩夹泥岩、硅质岩、火山岩建造及毗邻的碎屑岩对金成矿更有利。

With study on the distribution in time and space of elements of Au,As,Hg, and Sb and compared with sample, the authors think that the background value in upper Paleozoic strata (dominating carbonate rock) is higher, but lower in Triassic strata. The higher background value area is NW direction. It is correlated with development of Youjiang rift. The element of gold in upper Paleozoic strata in western Guangxi sourced mainly from plutonic source but from terrestrial in the Triassic clastic rock. It is favour for gold metallozation in higher background value carbonate rock formations interbedded with marl siliceous clastic rock volcanic rock and thier adjacent clastic rock.