摘要
西藏拔隆铅锌矿是近几年在冈底斯成矿带西段的找矿新发现,矿床位于冈底斯中段的隆格尔—念青唐古拉复合古岛弧带(冈底斯弧背断隆带)与措勤—申扎火山岩浆弧带两大次级构造单元接触带上。拔隆矿区含矿围岩为下白垩统则弄群火山岩,岩性为一套中酸性火山岩及火山碎屑岩,矿体主要赋存在NW向—近EW向的火山岩内断裂中,严格受断裂构造控制,呈脉状、透镜状等,具有后生成矿的特点。成矿与早白垩世火山岩浆活动密切,铅、锌具有相同的来源,均来自于则弄群火山岩,综合矿床成矿地质特征,初步认为本矿床成因类型为陆相火山热液型铅锌矿床。
Balong lead-zinc deposit in Tibet is a new prospecting discovery within the western of Gangdese ore belt in recent years.The mining area is located in the contact zone of the two major secondary structural units,Longer-Nyainqentanglha complex ancient island arc zone(Gangdiss arc anticline fault uplift zone)in the middle of Gangdise,and Cuoqin-Shenza volcanic magma arc zone.The main ore-bearing stratum in Balong mining area is Zenong group volacanic rocks of the Early Cretaceous.The lithology is mainly a set of intermediate-acid volcanic rocks and volcanic clastic rocks.The orebodies are mainly hosted at NW-nearly EW-trending faults in the volcanic rocks,which are strictly controlled by the fractures.The shape of orebody is veined and lenticular,with the characteristics of epigenetic mineralization.The mineralization is closely related to the Early Cretaceous volcanic magmatism.Lead and zinc have the same source.They all come from the volcanic rocks of Zeong Group.According to geological characteristics of the deposit,it is preliminarily considered that the genetic type of this deposit is a continental volcanic hydrothermal lead-zinc deposit.
作者
李伟良
王力圆
钱建利
杨选江
LI Weiliang;WANG Liyuan;Qian Jianli;YANG Xuanjiang(Northwest Nonferrous Engineering Co.,Ltd.,Xi’an 710038,Shaanxi,China;College of Zijin Mining,Fuzhou University,Fuzhou 350116,Fujian,China;Xi’an Mineral Resources Research Center of China Geological Survey,Xi’an 710100,Shaanxi,China)
出处
《矿产与地质》
2021年第3期393-401,共9页
Mineral Resources and Geology
基金
中国地质调查局“西藏尼玛县吉瓦地区铜多金属矿产远景调查”(1212011121250)项目资助。
关键词
铅锌矿床
地质特征
成因浅析
西藏拔隆
lead-zinc deposit
geological characteristics
genesis analysis
Balong area of Tibet
