甘肃省康县岸门口砂金矿床地质特征及成因浅析  

Geological Characteristics and Genesis of Anmenkou Placer Gold Deposit in Kangxian County,Gansu Province

作　　者：谈毅 TAN Yi(Baiyin Mineral Exploration Institute of Gansu Nonferrous Metal Geological Exploration Bureau,Baiyin 730900,China)

机构地区：[1]甘肃省有色金属地质勘查局白银矿产勘查院,甘肃白银730900

出　　处：《甘肃冶金》2021年第4期101-104,共4页Gansu Metallurgy

摘　　要：岸门口砂金矿床大地构造位于扬子板块与秦岭褶皱带接壤处的南侧,地层属摩天岭分区。矿区共圈出8条砂金矿体,各矿体均沿河床及其两侧河漫滩延伸而展布,走向与河道走向一致,随河道的弯曲而弯曲。砂砾层为矿区内主要矿石,矿石类型结构松散、无胶结。重矿物除自然金外,主要有锆石、黄铁矿、金红石、锐钛矿等。通过成矿物质来源,成矿物质运移过程及方式分析,认为气候和地貌特征为本区砂金矿形成的主要有利因素。依据砂金矿分布和产出特征,总结了砂金矿富集规律,确定岸门口砂金矿成因类型应为冲积砂金矿。The anmenkou placer gold deposit is located in the south of the border between the Yangze plate and the Qinling fold belt,the stratum belongs to Motianling division.There are 8 placer gold orebodies in the mining area,the ore bodies are distributed along the riverbed and the floodplain on both sides of the river bed,and the strike is consistent with that of the river,bend with the bend of the river.The gravel layer is the main ore in the mining area,and the ore type is loose in structure without cementation.In addition to natural gold,heavy minerals mainly include zircon,pyrite,rutile,anatase,etc.Through the analysis of the source of ore-forming materials,the migration process and mode of ore-forming materials,it is considered that the climate and geomorphic characteristics are the main favorable factors for the formation of placer gold deposits in this area.According to the distribution and production characteristics of placer gold,the enrichment law of placer gold is summarized,and the genetic type of the placer gold in Anmenkou is determined to be alluvial placer gold.

关 键 词：地质特征 砂金矿 富集规律 成因类型 

分 类 号：P618.51[天文地球—矿床学]