摘要
通过野外地质、岩相学、拉曼光谱和电子探针分析,对祁雨沟2号和4号含金角砾岩筒中冰长石方解石蚀变矿物组合特征进行了描述。含金角砾岩筒成矿作用分为两期:面状矿化和脉状矿化。面状矿化的蚀变主要有阳起石化、绿色黑云母化、绿泥石化、冰长石化、硅化、绿帘石化、黄铁矿化、碳酸盐化和少量的绢云母化。脉状矿化蚀变为硅化、绢云母化和少量的碳酸盐化。通过对角砾岩筒的蚀变与成矿作用关系研究,认为冰长石方解石蚀变与含金角砾岩金成矿作用是同期,从而确定祁雨沟含金角砾岩筒是一个典型的低硫型浅成低温热液型金矿床。
This paper reports some preliminary results obtained from field petrographic work, laser Raman microspectroscopy and electron microprobe analysis carried out on the Au-bearing Qiyugou breccia pipes. The adularia-calcite assemblage was recently discovered in the breccia gold deposit. Two stages of gold mineralization in the breccia pipes, i.e., pervasive and veined, were distinguished. The early pervasive alteration of actionlite, green biotite, epidote, chlorite and minor sericite replaced breccias and rock flour, followed by later adularia and calcite alteration filling the open space. Vein ores associated with quartz, sericite, and minor calcite alteration occur in NE-trending faults that cut pervasive ores. These results show that adularia-calcite alteration is associated with gold mineralization. The discovery of the adularia-calcite assemblage in the area suggests that the Qiyugou pipes are genetically of low-sulfidation epithermal type.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
2006年第1期77-84,共8页
Acta Petrologica et Mineralogica
基金
国家自然科学基金资助项目(40032010B)
黄金武警部队下达项目"华熊地块构造岩浆作用和成矿作用"
关键词
角砾岩筒
冰长石-方解石组合
浅成低温热液矿床
祁雨沟
gold-bearing breccia pipe
adularia-calcite assemblage
low sulfidation epithermal system
Qiyugou
