地质学报2017，Vol.91Issue(12)：2757-2770,14.
太行山南段铜矿成矿时代厘定及成矿意义
The Determination of Metallogenic Age of Copper Deposits in the Southern Section of Taihang Mountains, Hebei Province and its Metallogenic Significance
摘要
Abstract
Jingxing-Neiniu belt in the southern section of Taihang Mountains,with its excellent metallogenic conditions,has been an important target area for prospecting copper deposits.This study analyzed the previous research data (including ore type and metallogenic condition) and contrasted it with Cu-enriched areas in Zhongtiao Mountains.Due to the lacking metallogenic ages of copper deposits for a long time,it is impossible to precisely analyze metallogenic process and genesis of copper deposits,which imposes serious influence on the exploration and deployment of copper deposit in this area.With the Taoyuan Cu deposit and four copper mineralization prospects as our objectives in the study area,authors analyzed ore sulfates from Cu ore deposit and prospects mentioned above using Rb-Sr dating.The isotopic age results show that the Taoyuan copper deposits occurred in 1829.6Ma to 1840Ma,and Sanzaoping and Huzaikou mineralized points are 0183.7±5.2Ma and 1844.3±5.9Ma,respectively.The Rb-Sr isochron dating results of above three copper deposits (or points) show that there is a large scale mineralization in late Paleo-Proterozoic,with metallogenic time limit between 1830 Ma-1844Ma.But the mineralization time of Fangnao and Luyu mineralized points respectively are 1402±23Ma and1376±37Ma,which have significantly different from the Taoyuan copper deposit and two copper points.This indicates that another mineralization may occur in the Mesoproterozoic period.Together with the structural evolution of the north China platform,,the first copper mineralization in the south of Taihangshan area occurred in the late Paleoproterozoic period,and this is close to mineralization time of the Hubi-type copper deposits.It can be concluded that copper mineralization is closely associated with the Luliang movement.Copper ore deposits in south of Taihangshan area is located in the intracontinental rift tectonic environment,while Cu enriched areas in Zhongtiaoshan just lie in the north margin of Qinling-Dabie active belt,where is the subduction zone of Qinling paleooceanic to the north China platform.The difference in tectonic settings may lead to large differences in potential and scale of copper mineralization.Compared with the first copper mineralization period,the second one occurring in the Mesoproterozoic period is relatively weak in both scale and mineralization.Its metallogenic dynamics mechanism needs further study.关键词
铜矿/成矿时代/构造环境/成因类型/太行山南段Key words
copper deposit/metallogenic age/structural environment/genetic type/south of Taihang Mountains引用本文复制引用
李随民,刘红玉,陈凤河,栾文楼,宋泽峰,崔邢涛,王银喜..太行山南段铜矿成矿时代厘定及成矿意义[J].地质学报,2017,91(12):2757-2770,14.基金项目
本文为河北省国土资源厅基金项目(编号2012055548)和(编号2013045655)联合资助的成果. （编号2012055548）
