青海窑洞山东金矿床地质特征及找矿标志初探  

Geological Characteristics and Prospecting Criteria of Gold Deposit in Eastern Yaodong Mountain,Qinghai

作　　者：刘峰 郑玉萍 王鹏 霍毅 苗虎林 LIU Feng;ZHENG Yuping;WANG Peng;HUO Yi;MIAO Hulin(Qinghai Xiyu Xianglong Mining Co.,Ltd.,Xining 810000,Qinghai,China)

机构地区：[1]青海西域祥龙矿业有限公司,青海西宁810000

出　　处：《中国钼业》2024年第5期20-24,共5页China Molybdenum Industry

摘　　要：窑洞山东金矿地处昆中断裂与昆南断裂两大断裂夹持的复杂构造带中,位于东昆仑山中段,本次研究在以往地质矿产勘查工作的基础上,开展了槽探、钻探及样品测试分析工作,对窑洞山东金矿成矿地质条件与矿床成因进行了研究。研究发现:窑洞山东矿床成矿类型为与构造、热液活动有关的构造蚀变岩型金矿床。找矿标志方面,奥陶-志留纪纳赤台群哈拉巴依沟组下段中绢云母千枚岩、变长石石英砂岩是金的主要找矿层位;区内发现脆性断裂为主要的找矿标志金矿体主要赋存于叠加在韧性剪切带之上的脆性断裂;地表石英脉集中分布区是主要的找矿标志;黄铁矿化、硅化、褐铁矿化与成矿关系密切,往往黄铁矿含量越高、硅化越强越有利成矿。Eastern Yaodong Mountain gold deposit located in the middle section of East Kunlun Mountains,in a complex structural belt sandwiched between the Kunzhong Fault and the Kunnan Fault.On the basis of previous geological and mineral exploration work,this study conducted trenching,drilling,and sample testing analysis to investigate the geological conditions and genesis of Eastern Yaodong Mountain gold deposit.It is found that the mineralization type of the Eastern Yaodong Mountain deposit is a tectonic altered rock type gold deposit related to tectonic and hydrothermal activity.In terms of prospecting criteria,sericite phyllite and meta-feldspar quartz sandstone in the lower Halabayigou Formation of Ordovician-silurian nacitai group are the main prospecting horizon for gold in this area,brittle faults are found as the main prospecting criteria,and the gold ore bodies mainly occur in the brittle faults superimposed on the ductile shear zone pyrite mineralization,silicification and limonite mineralization are closely related to mineralization.The higher the content of pyrite,the stronger the silicification,the more favorable to mineralization.In terms of prospecting indicators,the lower section of the Harabayigou Formation in the Ordovician Silurian Nachitai Group is mainly composed of sericite phyllite and plagioclase quartz sandstone,which are the main prospecting layers for gold;The discovery of brittle fractures as the main prospecting indicator in the area indicates that gold deposits mainly occur in brittle fractures superimposed on ductile shear zones;The concentrated distribution area of surface quartz veins is the main prospecting indicator;Huangtie mineralization,silicification,and limonitization are closely related to mineralization,and often the higher the content of pyrite and the stronger the silicification,the more favorable it is for mineralization.

关 键 词：地质特征 找矿标志 矿床成因 金矿床 

分 类 号：P618.51[天文地球—矿床学]