湘中锡矿山式锑矿锑与砷、金的共生分异现象

通过湘中锡矿山式锡矿矿化蚀变特征及矿化蚀变岩石微量元素统计分析，阐述了成矿作用中锑与金、砷共生分异的现象，并以因子分析为手段，提取成矿作用中最主要的两个特征因子，综合地质分析，指出锑矿成矿过程中主要包含有两种地质作用：硅化与锑矿化。硅化和锑矿化分别同砷、金富集和锑矿质沉淀析出相联系，从而造成锑与金、砷共生分异。硅化作用主要在成矿早期，温度较高（200－300℃），砷、金主要在这一阶段析出。锑矿化则集中发生在成矿作用晚期，温度较低（100－200℃），辉锑矿以裂隙充填方式沉淀成矿。对锑与金、砷共生分异的认识较好地解释了矿化带上成矿特征指示元素在元素聚类分析中不相关的矛盾。

PARAGENESIS AND DIFFERENTIATION OF As, Au WITH Sb IN XIKUANGSHAN-TYPE ANTIMONY DEPOSITS, CENTRAL HUNAN

On the basis of mineralization characteristics and the statistical analysis of element contents in altered rocks, this paper deals with the paragenesis and differentiation of As, Au with Sb in the Xikuangshan-type antimony deposits in the central part of Hunan Province. Factor analysis extracts two main factors, one represents silicification and the other antimony mineralization. For the former connected with enrichment of As, Au and the latter with Sb,it causes differentiation of metallogenitic elements. With precipitation of As and Au, silicification took place at the early metallogenic stage at relatively high temperature (200～300℃), forming silicified rocks. Antimony precipitation occurred mainly at the late stage at lower temperature (100～200℃), and stibnite filled in fractures or fissures. This paper gives a good explanation of why high-abundance paragenesis elements in the metallogenic province show no correlation in cluster analysis.