围岩蚀变过程中地球化学组分质量迁移计算——以湖南沃溪金锑钨矿床为例  

The Immobile Elements Identification and Mass Transport in the Geochemical Process of Wall-rock Alteration——The Case of Gold-Antimony-Wolf ram Deposit at Woxi in Hunan Province

作　　者：高斌[1] 马东升[1] 刘连文[1] 

机构地区：[1]南京大学内生金属矿床成矿机制研究国家重点实验室,210093

出　　处：《地质学报》1999年第3期272-277,共6页Acta Geologica Sinica

基　　金：国家自然科学基金(编号49733012;49473186)

摘　　要：在以往围岩蚀变的质量迁移研究基础上,本文提出了一种判定惰性元素的方法,同时结合等浓度线和加权最小二乘法;给出研究热液围岩蚀变中组分质量迁移的计算方法。在判定惰性元素时,更多地应用了线性回归分析中的方差分析和回归诊断参数与计算方法。这一系列的参数与方法被用于评述湖南沃溪金锑钨矿床褪色化围岩蚀变质量迁移,取得了较好的效果。研究表明.在沃溪矿床围岩蚀变过程中,Ti表现出了一定的活动性。The main purpose of this paper is to introduce a new method to study the immobile elements and mass transport of in geochemical process of wall-rock alteration. A linear regression model is established based on Grant's equation (Grant, 1986) and the Overlap Cone method (Baumgart-ner et al,1995). For every immobile element, it is a straight-line equation with a zero intercept and an unspecified slope. We first introduce a set of experimental data of major elements' concentration into the equation followed by variance and influence analysis to identify immobile elements. Finally, we use the immobile elements to fit the slope. When the con-centration of every element is substituted in the fitted straight-line equation, its mass transport and mass changes are calculated. As a study case, this method is used to discuss the mass transport of the major elements in the bleached alteration in the gold-antimony-wolfram deposit at Woxi, Hunan Province , China. The calculation indicates that about 8 percent mass of the amaranthine slate from the deposit was overall lost during the alteration. The numerical result agrees well with either the geological observations or the geochemical literature. In addition, this paper discusses the geochemical behaviour of many elements, titanium, manganese and phosphorus in particular. The study also suggests that the element titanium shows some mobility under given conditions of the wall-rock alteration in the Woxi deposit, so sometimes it might not be suitable to arbitrarily take titanium as an immobile element to evaluate mass transport in a wall-rock alteration process.

关 键 词：地球化学 围岩蚀变 钨矿床 金矿床 锑矿床 

分 类 号：P618.510.4[天文地球—矿床学] P618.660.4[天文地球—地质学]