湖南漠滨石英脉型金矿成因探讨  

A PRELIMINARY DISCUSSION ON THE CENESIS OF THE MOBIN QUARTZ VEIN TYPE GOLD DEPOSIT IN HUNAN PROVINCE

作　　者：周德忠[1] 叶大元[1] 余大龙[1] 

机构地区：[1]贵州工学院地质系

出　　处：《矿床地质》1989年第1期51-64,共14页Mineral Deposits

基　　金：国家自然科学基金

摘　　要：漠滨金矿为一贫硫化物石英脉型金矿。本文着重阐述了具代表意义的Ⅱ-脉的地质特征;通过对矿物包裹体的系统研究及氢、氧、硫、铅等的同位素研究,探讨了成矿热液的来源和运移方向,认为该矿床属典型的偏低温混合热液充填型矿床;并指出了进一步找矿的方向和远景区。There occur abundant quartz vein type gold deposits in epimetamorphie rocks of Proterozoic Banxi Group extensively exposed in the border area between western Hunan and eastern Guizhou. The Mobin gold deposit is a mediumsize sulfides-poor and gold-bearing quartz vein deposit which is quite typical in this area.The authors have made rather detailed investigation into the most typical gold-bearing quartz vein in the Mobin gold ore district—No. II_(Lower) vein in the aspects of mineral inclusions and stable isotopes, which yields some conclusions:1. The ore deposit is somewhat of typical epithermal filling type one wtih ore-forming temperature in the range of 120℃—220℃.2.Metallogenesis is strictly controlled by fractures, and the intersections of these fractures seem to be closelly related to rich orebodies: near them, mineralization is strong and ore is relatively rich; farther away, things are just the opposite. The regular spatial variations in temperature, salinity, density, compo sition, δ^(34)S and δD values of inclusions suggest that the ore deposits were formed as a result of the migration of ore fluids along the fracture and the infilling of these fluids into the secondary order interformational fracture zones.3.The ore-forming fluids might have been a kind of mixed solution of metamorphic water with some underground hot water; the ore-forming element gold and other related elements came partly from wall rocks and partly from underlying strata.The authors consider that blind gold-bearing quartz ore deposits might exist at the southwestern end of the present mining area, especially at the depth of the intersection between F_1 and F_2, which is therefore a favorable position in search for rich ores in ore district. In ore prospecting on the outskirts of the ore district, attention should be paid to NWW-, NW-and NE- trending fracture zones, especially to the secondary order fractures near the intersection or the compounding position of two fracture zones.

关 键 词：石英脉 矿物包裹体 成矿热液 金矿 

分 类 号：P618.510.1[天文地球—矿床学]