摘要
本文通过控矿地层和矿床的地球化学对比研究后指出,湘西元古界板溪群发育的Sb、Au矿化与控矿地层中成矿元素的高离散性、多峰态分布特征相协调。由沃溪Au-Sb-W矿化到渣滓溪Sb矿化,其矿化流体的∑S浓度显著降低,大气降水的比例不断升高。成矿流体的∑S浓度及成矿温度是控制渣滓溪Sb矿化及湘西Sb、Au矿化分带的主要因素。
Based on a geochemical comparison between ore-control strata and ore deposits, the present paper points out that Sb(Au)mineralizations well-developed in Proterozoic Banxi Group of western Hunan are consistent with high-discretization and multi-kurtosis distribution of ore-forming elements in the ore-control strata. The high-discretization and multi-kurtosis distribution characteristics of ore-forming elements may serve as favorable geochemical criteria for ore-prospecting in this region. From Woxi Au-Sb(W) mineralization within the Jiangnan old land to Zhazixi Sb mineralization on the margin of the old land, ΣS concentration of the mineralizing fluids decreases obviously, and the proportion of meteoric water gets increasingly larger. Sulfur ligand and its concentration in ore-forming fluids as well as temperature of the fluids constitute major geochemical mechanism controlling Sb, Au mineralization and its zoning in western Hunan, whereas abundances of ore-forming elements in the ore-control strata merely play subordinate role. Ore-forming fluids characterized by relatively high temperature (t_(max)264℃, early average temperature of the principal ore-forming stage 232℃) and rich sulfur (_(ΣS)1.86mol/l)and ore-forming fluids noted for relatively low temperature (t_(max)222℃, early average temperature of the principal ore-forming stage 198℃) and low sulfur (_(ΣS)0.25mol/l) control Woxi Au-Sb mineralization and Zhazixi Sb mineralization respectively.
出处
《矿床地质》
CAS
CSCD
北大核心
1996年第1期41-52,共12页
Mineral Deposits
基金
国家自然科学基金(49173171)
高等院校博士点基金
关键词
锑矿带
地球化学
成矿流体
锑矿床
Zhazixi antimony ore belt, geochemistry, ore-forming fluid
