关于滇东北MVT型铅锌矿成矿时代的讨论  

Discussion on the metallogenic age of Mississippi Valley-type(MVT)lead—zinc deposit in Northeastern Yunnan

作　　者：蒋斌斌[1] 祝新友 黄行凯[1] 赵伟策 吕晓强 刘孜[1] JIANG Binbin;ZHU Xinyou;HUANG Xingkai;ZHAO Weice;Lü Xiaoqiang;LIU Zi(Beijing institute of geology for mineral resources Co.,LTD.,Beijing,100012;Sino-Zijin Resource Ltd.,Beijing,100012)

机构地区：[1]北京矿产地质研究院有限责任公司,北京100012 [2]中色紫金地质勘查(北京有限责任公司),北京100012

出　　处：《地质论评》2022年第1期138-146,共9页Geological Review

基　　金：中国铜业有限公司重点科技计划项目(编号:[2019]048)的成果。

摘　　要：滇东北地区是我国重要的铅锌矿产品生产基地,区内发育多个大型密西西比河谷型(Mississippi valley-type,MVT型)铅锌矿床,个别矿床(会泽)达到超大型。前人对该区域的铅锌矿床开展了大量的年代学研究工作,获得了一大批成矿年龄,本文在通过对各类同位素测年方法在该类型矿床中使用存在的弊端进行分析后,基于滇东北地区的地质构造事件,即滇东北地区从晚震旦—早白垩世沉积的地层之间均为整合或平行不整合接触,由此推断该地区发生大规模冲断—褶皱事件的时间应该在晚白垩世—古近纪,而区域性的冲断—褶皱带控制着滇东北MVT型铅锌矿床的产出,因此认为滇东北MVT型铅锌矿床的成矿时代为晚白垩世—古近纪。Northeastern Yunnan is an important production base of lead—zinc mineral products in China.There are many large-scale MVT type lead—zinc deposits in the area,and some deposits such as Huize are super large.A large number of geochronological studies have been carried out on the lead—zinc deposits in this area,and a large number of metallogenic ages have been obtained,this paper is based on the analysis of the disadvantages of various isotopic dating methods used in this type of deposit and the geological tectonic events in Northeastern Yunnan,geological facts show that from the late Sinian to early Cretaceous,the strata in northeastern Yunnan are in conformity or parallel unconformity contact,so it is inferred that the large-scale thrust fold event occurred in the region during the late Cretaceous to early Tertiary,and the regional thrust fold belt controlled the occurrence of MVT type lead—zinc deposits in northeastern Yunnan,Therefore,it is considered that the mineralization age of MVT type Pb Zn deposit in Northeastern Yunnan is from Late Cretaceous to early Tertiary.

关 键 词：滇东北 铅锌矿 密西西比河谷型(MVT型) 成矿时代 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]