小秦岭金矿流体包裹体的初步研究

本文据流体包裹体特征,研究了产于太古界太华群中石英脉型和蚀变岩型金矿。根据流体包裹体的特征及有关参数,对与矿化有关的石英脉进行了形成期次的划分,提供了成矿信息,并对矿床成因进行了初步探讨。

A PRELIMINARY STUDY OF THE FLUID INCLUSION IN THE XIAO QINLING GOLD DEPOSITS

The Xiaoqinling goldfield is one of the most important gold diggings. The types of the gold ore are mainly diveded into the gold-bearing quartz, vein and the gold-bearing altered rock one. From the point of view of fluid inclusion the writer made a preliminary study of the minerogenetic stage, the forming temperature, the forming environments and the genetic mechanism of the gold deposits for the gold-bearing quartz vein type and the gold-bearing altered rock type that were distributed in the Xiaoqinling areas and produced in the Archaeozoic Taihua Group. According to the studied results, it is. preliminarily thought that the formation of the both types of the gold deposits may be divided into three minerogenetic stages. The minerogenetic temperature belongs to the middle and low temperatures. Along with the process of the minerogenesis the minerogenetic temperature takes on the trend of the constant decrease from the early period to the later one. The fluid inclusions having formed in the different minerogenetic stages are obviously di- fferent in types, compositions, sizes, states and distributions. For the ore-bearing quartz vein and the ore-finding-free quartz vein, the CO2 content in the inclution is of evident difference. The CO2 content in the quartz vein is the highest, while the CO2 content in the altered-rock type comes second. The co content in the ore-finding-free quartz vein is the lowerest.According to the results of the cluster analysis of the Q-type and the factor analysis of the R-type, the writer believes that there are certain differences in the inclusion compositions of the quartz vein type gold ore, the altered rock type gold deposit and the dead quartz lode.