摘要
华北克拉通北缘新太古代清原绿岩带,以产出中国最古老的红透山火山岩型块状硫化物(VMS)铜锌矿床而闻名.但近年同位素年代学研究表明,该绿岩带还发育同期的条带状(BIF)铁矿.对该绿岩带开展BIF铁矿、VMS铜锌矿时空和成因关系及其形成构造背景和海洋环境的研究非常必要.在综述近年笔者及前人获得的清原绿岩带地质剖面观察、典型VMS铜锌矿床和BIF铁矿床地质、锆石U-Pb年代学、主微量元素和Nd-Fe-S同位素地球化学等资料的基础上,总结了清原绿岩带VMS-BIF矿床组合形成的构造背景、成矿物质来源及形成规律.最后建立了新太古代清原绿岩带VMS-BIF弧后盆地系统成矿模式.这对于指导区域找矿预测、了解新太古代陆壳演化和古海洋环境均有重要的科学意义.
The Neoarchean Qingyuan greenstone belt(QGB)is located in the northern margin of the North China Craton(NCC).It is characterized by the occurrence of the oldest Cu-Zn volcanogenic massive sulfide(VMS)deposits in China.Recent geochronological data indicates that the QGB also hosts a certain amount of Neoarchean BIF-type iron deposits.Hence,a detailed study on the enigmatic association of VMS and BIF deposits should be conducted urgently.In this study,the previous geological,U-Pb geochronological,element geochemical,as well as Nd-S-Fe isotopic data on the VMS,BIF,and associated lithologies of the QGB was reviewed in detail.Based on the review,we concluded the tectonic setting,source of ore-forming materials,and genesis of the QGB VMS-BIF paragenetic assemblage,and thus established a ore-forming model in a back-arc basin for the QGB VMS-BIF metallogenic system.Generally,this model is significant in assessing regionally metallogenic endowment,and also in better understanding Archean continental crust evolution and marine environment.
作者
张连昌
彭自栋
翟明国
佟小雪
朱明田
王长乐
Zhang Lianchang;Peng Zidong;Zhai Mingguo;Tong Xiaoxue;Zhu Mingtian;Wang Changle(Key Laboratory of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Institutions of Earth Science,Chinese Academy of Sciences,Beijing 100029,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2020年第1期1-16,共16页
Earth Science
基金
国家自然科学基金项目(No.41572076)
国家重点基础研究发展计划(973计划)项目(No.2012CB416601).
关键词
清原绿岩带
新太古代
火山岩型块状硫化物
条带状铁建造
矿床组合
华北克拉通
岩石学
Qingyuan greenstone belt
Neoarchean
volcanic-hosted massive sulfide
banded iron formations
assemblage of ore deposit
North China Craton
petrology
