藏东察雅县优日铅银多金属矿床地质特征及赋矿规律研究  

The geological features and mineralization rules of Youri lead-silver polymetallic deposits in Chaya County,Eastern Tibet

作　　者：于涛[1] YU Tao(College of Science,Tibet University,Lhasa 850000,Tibet,China)

机构地区：[1]西藏大学理学院,西藏拉萨850000

出　　处：《资源信息与工程》2022年第4期15-18,23,共5页Resource Information and Engineering

摘　　要：藏东察雅县优日矿区地处三江特提斯构造域的北段,空间上位于昌都—芒康盆地内,区内发育大型的走滑断裂及岩浆活动,造就了丰富的有色金属和贵金属资源,如优日铅银多金属矿床等。为进一步指导优日铅银多金属矿床的找矿勘查工作,本文在总结该矿床地质特征的基础上分析了赋矿规律,进而提出找矿标志。结果表明:优日铅银多金属矿床的主要赋矿空间为中二叠统交嘎组与上二叠统妥坝组第一岩性段火山凝灰岩接触部位形成的滑脱破碎带;矿区矿化蚀变较为发育,重晶石化和方解石化与矿区的成矿关系最为密切;矿化在垂向上具有上部以铜矿化为主、下部以铅矿化为主的基本变化特征;岩性接触带和地表矿化露头是矿区主要的直接找矿标志,围岩蚀变和地球化学异常是矿区主要的间接找矿标志。Located in the northern section of the Sanjiang Tethys tectonic domain,Youri mine area in Chaya County,Eastern Tibet,is spatially located in the Changdu-Mangkang Basin,where developed large-scale slippage faults and magmatic activities in the area,that created rich non-ferrous and precious metal resources,such as the Youri lead-silver polymetallic deposit.In order to further guide the prospecting and exploration of the Youri lead-silver polymetallic deposit,this paper analyzed the mineral occurrence regularity of the mining area on the basis of the geological features of the deposit,and then research the prospecting criteria.The results showed that the main ore bearing space of the Youri lead-silver polymetallic deposit is the slip fracture zone formed at the contact site of the first lithological section of the Middle Permian Jiaoga Formation and the first lithological section of the Upper Permian Toba Formation.Mineralization and alteration in mining areas are well developed,and baratization and cristobalization are most closely related to mineralization in the mining areas.Mineralization has the basic change features of copper mineralization in the upper part and lead mineralization in the lower part in the vertical direction.Lithological contact zones and surface mineralized outcrops are the main direct prospecting criteria in mining areas,and surrounding rock alteration and geochemical anomalies are the main indirect prospecting criteria in mining areas.

关 键 词：铅银多金属矿床 地质特征 赋矿规律 找矿标志 矿化蚀变 

分 类 号：P618[天文地球—矿床学]