西藏边坝县出波松多银铅矿成矿特征及成因分析  

Metallogenic Features and Genesis Analysis of Chubosongduo Ag-Pb deposits from Bianba County, Tibet

作　　者：杨战士[1] 

机构地区：[1]河南省地质矿产勘查开发局第十一地质队,河南商丘476000

出　　处：《资源导刊（地球科技版）》2012年第7期9-13,共5页

摘　　要：根据化探异常所圈定的靶区，在西藏边坝县尼木乡出波松多地区发现了与闪长岩侵入有关的银铅矿床。矿体赋存于下一中侏罗统希湖群变质砂岩地层中。该矿区的成矿元素组成与该成矿带内其他铅锌矿床及国内外其他主要沉积岩容矿型铅锌矿床有所不同，以银铅共生组合为特征。矿石成分分析及矿石矿物成分的分析表明，该矿床银铅密切共生，且呈方铅矿产出。综合分析认为，该矿床的成矿作用可能与新生代深部构造一岩浆活动有密切关系，其成矿背景与印度板块碰撞作用有关，成矿物质主要来源于与剪切作用有关的构造一岩浆活动，区内沉积地层中的建造水或地下水参与了成矿，部分成矿物质可能来源于下覆三叠系，成矿流体的驱动机制包括上部重力驱动，以及深部构造一岩浆活动热源驱动所形成的大规模成矿流体运动。According to the geochemical anomalies delineated by the target area, argentalium ore deposits intruded by into the diorite from Chubosongduo area, Nimu Town, Bianba County in Tibet. Ore bodies occurred in the Lower-Jurassic metamorphic sandstone Xihu Group. The metallogenic elements of the mine is different from other Pb-Zn deposit from home and abroad in the same metallogenic belt, the main feature of it is silver lead symbiosis. The mineral composition analysis and ore mineral composition analyses indicate that the deposit Ag-Pb close symbiosis, and present a galena output. Comprehensive analysis indicates that it of the ore mineralization may have a close relationship with the Cenozoic deep tectonic-magma activity. The mineralization backgrounds relevant to the Indian plate collision function, ore-forming materials mainly come from the tectono- magmatic activities about shearing action. Sedimentary stratigraphical build water or groundwater participated in the metallogenic function, part of ore-forming materials may originated from the Lower Triassic, ore-forming fluid drive mechanism include upper gravity drive, and deep tectonic-magmatic activities heat source drive by the formation of the metallogenic fluid movement.

关 键 词：西藏 出波松多 地球化学 闪长岩 银铅矿 热液型 

分 类 号：P618.510.5[天文地球—矿床学]