格尔木东大滩金锑矿床地质特征及找矿远景  

Geological Characteristics and Prospecting Potential of Dongdatan Gold and Antimony Ore Deposit in Golmud

作　　者：王勇 曾修伍 蒋天龙 刘鑫 刘振锋 WANG Yong;ZENG Xiu-wu;JIANG Tian-long;LIU Xin;LIU Zhen-feng(The Third Geological Brigade of Sichuan Province,Chengdu 414000;The Third Non-Ferrous Geological Exploration Institute of Qinhai Province,Xining 810012)

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

出　　处：《四川地质学报》2023年第2期220-226,共7页Acta Geologica Sichuan

摘　　要：东大滩金锑矿是青藏北特提斯布喀达坂-青海南山华力西、印支复合造山带上的一个中型矿床。通过对多年来的地质勘查成果及前人资料的综合研究,深入分析了矿床的地层、构造、矿化蚀变、地球化学等成矿条件,总结了矿床地质特征。东大滩金锑矿赋存于下三叠统下巴颜喀拉山亚群下部砂岩中,初步划分的Ⅰ、Ⅱ、Ⅳ三个矿段39条金锑矿体的形态和规模均受东大滩-西大滩活动断裂的次级构造F_(1)、F_(2)断层及其次级裂隙控制,为印支期的构造热液型金锑矿床。其中Ⅰ_(1)、Ⅱ_(1)、Ⅳ_(4)矿体均位于F_(1)矿化构造破碎蚀变带中,走向上有较明显相连的趋势,推测可能为同一矿体。矿段间空白区和深部及外围南东方向锑矿东沟尾部的构造破碎带是下步重点的找矿远景区,近一步工作矿床规模有望达到大型。Dongdatan gold and antimony ore deposit is a medium-size deposit in the North Tethysbukadaban-QinhaiNanshan Variscanand IndosinianOrogenic Belt.Based on the comprehensive study of the previous data of geological exploration results for recent years,the stratigraphic,structural,mineralized alteration and geochemical characteristics of the deposit are deeply analyzed,and the geological characteristics of the deposit are summarized.Dongdatan gold and antimony ore deposit is located in the lower sandstone Formation of Lower Bayan Kerashan subgroup of Lower Triassic.The 39 gold antimonyorebodies in the three ore segments Ⅰ,Ⅱ and Ⅳ are controlled by the secondary structure F_(1) and F_(2) faults and their secondary cracks of Dongdatan-Xidatan active fault.It is a tectonic hydrothermal gold and antimony deposit of formed in the Indosinian.The orebodies of Ⅰ_(1),Ⅱ_(1) and Ⅳ_(4) are located in the F_(1) mineralization structural fracture alteration zone,and there is an obvious trend of connection in the strike,it is speculated that they may be the same orebody.The blank area between ore segments and the structural fracture zone at the tail of Donggouantimony deposit in the deep and southeast direction of the outer are the next important prospecting potential areas,and the scale in the future is expected to reach large scale deposit.

关 键 词：金锑矿 地质特征 找矿远景 东大滩 

分 类 号：P618.51[天文地球—矿床学] P618.66[天文地球—地质学]