福建紫金山矿田早白垩世以来构造演化和成岩成矿时空格架  

THE EARLY-CRETACEOUS TECTONIC EVOLUTION AND THE SPATIAL-TEMPORAL FRAMEWORK OF MAGMATISMMINERALIZATION IN ZIJINSHAN ORE-FIELD,FUJIAN PROVINCE

作　　者：潘天望 袁远[3] 吕勇[1,2] 史文强 PAN Tianwang;YUAN Yuan;LYU Yong;SHI Wenqiang(Institute of Karst Geology,CAGS,Guilin 541004,Guangxi,China;Key Laboratory of Karst Dynamics,MNR&GZAR,Guilin 541004,Guangxi,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质科学院岩溶地质研究所,广西桂林541004 [2]自然资源部广西岩溶动力学重点实验室,广西桂林541004 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地质力学学报》2019年第1期61-76,共16页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(DD20160061;DD20179313)

摘　　要：在充分吸收已有工作成果的基础上,文章系统总结了紫金山矿田的典型矿床类型及特征,探讨了早白垩世伸展构造背景下该矿田成岩成矿作用与北西向上杭—云霄成矿带的关系,并建立了早白垩世(145 Ma～)到晚白垩世早期(～92 Ma)紫金山矿田成岩成矿作用的时空格架。研究认为由于古太平洋板块俯冲作用体系的影响,早白垩世以来(145 Ma～)紫金山矿田总体上受北西向上杭—云霄深断裂多次活化作用的控制,依次经历了145～120 Ma伸展初期小规模的岩浆—成矿活动、125～110 Ma短暂的岩浆间歇期、110～92 Ma幔源物质大规模参与的岩浆活动及相应的斑岩型—浅成低温热液型(Cu-Au-Mo-Ag)多金属成矿作用。This paper presents a systematic review of major types and characteristics of the representative deposits in the Zijinshan ore-field by integrating with previous studies,which is in an attempt to establish the spatial-temporal framework of magmatic-metallogenic events during 145~92 Ma time interval and,on that basis,investigate its relationship with the NW-trending Shanghang-Yunxiao mineralization belt under the Early Cretaceous extension setting.We conclude that the magmatism-mineraliztion of the Zijinshan ore-field was mainly controlled by the multiple activation of the NW-trending Shanghang-Yunxiao deep fault in response to Pacific plate subduction.There occurred a small scale of the magmatism and metallogenesis in the Zijinshan ore-field when the regional tectonic regime inversed from compression to extension(145~125 Ma),whereas the intense crust-mantle interaction induced large scale of magmatism and mineralization during the 110~92 Ma in response to the enhanced crust extension,which resulted in generating the giant Zijinshan porphyry-epithermal Cu-Au-Mo-Ag ore system.It’s worth noting that a transient tectonic inversion lasted from 125~110 Ma separated the two extension stage mentioned above.These transpression gave rise to the short magmatic quiescence in our study area.

关 键 词：构造演化 成岩成矿关系 时空分布规律 紫金山矿田 上杭—云霄成矿带 

分 类 号：P548[天文地球—构造地质学] P612[天文地球—地质学]