青海格尔木东大滩金锑矿成矿模式探讨  

Mineralization Model of the Dongdatan Gold Antimony Deposit in Golmud,Qinghai Province

作　　者：王勇 曾修伍 蒋天龙 刘鑫 周琳雄 刘振锋 WANG Yong;ZENG Xiuwu;JIANG Tianlong;LIU Xin;ZHOU Linxiong;LIU Zhenfeng(The 3rd Geological Brigade of Sichuan,Chengdu,Sichuan 611230;Qinghai Nonferrous Geological and Mineral Exploration Bureau Third Geological Exploration Institute,Xining,Qinghai 810012)

机构地区：[1]四川省第三地质大队,四川成都611230 [2]青海省有色第三地质勘查院,青海西宁810012

出　　处：《地质与勘探》2023年第3期545-556,共12页Geology and Exploration

摘　　要：青海格尔木东大滩金锑矿是20世纪90年代发现的老矿山,本次勘查工作将矿床规模由小型提升至中型,且具有大型矿床的成矿潜力。为进一步促进矿床及周边的找矿工作,开展了矿物包裹体测试和稀土含量分析等工作;并在系统整理所取得的成果基础上,总结矿床特征和成矿的物化条件,探讨了矿床成因和成矿模式。研究认为东大滩金锑矿成矿金属离子主要来源于三叠系昌马河组碎屑岩地层,成矿流体由地层中变质水和大量大气降水及少量由深大断裂带入的上地幔岩浆水混合而成。成矿过程为低盐度、低密度的成矿流体在中浅埋深、中低压力、中低温度的条件下形成矿体;成矿时代为印支末期;成因类型属中低温构造热液型矿床。The Dongdatan gold-antimony deposit is an old mine discovered in the 1990s.This exploration has increased the scale of the deposit from small to medium,and this deposit is expected to be a large-scale one.In order to guide the prospecting work of the deposit and its surroundings,mineral inclusion tests and rare earth content analysis have been carried out.On the basis of systematical sorting out previous achievements,this work summarized the characteristics of the deposit,analyzed the physical and chemical conditions of mineralization,and analyzed the genesis and metallogenic model of the deposit.It is considered that the metallogenic metal ions in Dongdatan gold-antimony deposit were mainly derived from the clastic rocks of the Changmahe Formation of Triassic,the ore-forming fluid was composed of metamorphic water in the formation,a large amount of precipitation in the atmosphere and a small amount of magmatic water in the upper mantle brought in by deep and large faults.The ore-forming process was that the ore-forming fluid with low salinity and low density forms ore body under the conditions of middle-shallow depth,middle-low pressure and middle-low temperature.The metallogenic age belongs to the Late Indosinian stage,and the genetic type belongs to meso-low temperature structural hydrothermal deposit.

关 键 词：金锑矿 矿床成因 成矿模式 东大滩 格尔木 青海省 

分 类 号：P611.5[天文地球—矿床学] P571[天文地球—地质学]