陕西洛南陈耳金矿床地质特征及成因探讨

Geological Characteristics and Genesis of Chener Gold Deposit in Shaanxi Province

通过对小秦岭金矿田中陈耳金矿床矿体宏观特征、矿石物质组成和结构构造特征、围岩蚀变、矿床地球化学特征分析,结合前人成岩、成矿年代学研究成果,显示本区主要存在2期成矿及叠加成矿作用:早期印支期形成蚀变糜棱岩型金矿,成矿作用与韧性剪切作用有关;晚期燕山期形成石英脉型金矿,成矿作用与岩浆热液作用有关。2期成矿作用所形成的矿石类型、矿石结构构造、控矿构造的方向性质、围岩蚀变、流体包裹体特征均有较大差异,在空间上具有一定程度的叠加但不完全重叠,叠加成矿作用使矿体进一步富集。指出本区金矿具有叠加改造成矿作用的特征,在东西、南北向构造交汇部位是找金矿的有利靶区。

In this paper, macroscopic characteristics, ore material composition and structural features,wall rock alteration,geochemistry of Chen’er gold deposition of the Xiaoqinling gold field was analyzed.Combining with previous researches on diagenesis and mineralization chronol-ogy,it is indicated that this region has mainly experienced two metallogenic and superimposed mineralization stages： early Indosinian when altered mylonite-type gold deposit was formed, whose mineralization effects was related to ductile shear,and late Yanshanian,when the quartz vein type gold depositwas formed,whose mineralization was related to magmatic hydrothermal process.The ore type,ore texture and structure,ore controlling tectonic direction properties, wall rock alteration,fluid inclusion characteristics formed in the two stages of mineralization arequite different,with a certain degree of superposition in space but not completely overlap.Super-imposed mineralization further enriches the ore bodies.It is indicated that Chener gold deposit has superimposed and reformed mineralization characteristics.East-west and south-north inter-sectionsare favorable target areas for gold deposit prospecting.