矿床地质2017，Vol.36Issue(2)：463-482,20.DOI:10.16111/j.0258-7106.2017.02.013
东昆仑祁漫塔格早中生代大陆地壳增生过程中的岩浆活动与成矿作用
Magmatism and mineralization during Early Mesozoic continental accretion process in Qimantag, East Kunlun Mountains
摘要
Abstract
The Qimantag area in East Kunlun Mountains,which is located on the northern margin of the Tibetan Plateau,is a typical continental accretion orogenic belt.During the Paleozoic to Early Mesozoic accretionary orogenic process,there were active magmatism and mineralization.Through the research about distribution and petrogenesis of Early Mesozoic intrusive magmatic rocks as well as geological characteristics,ore-forming fluids,ore-forming materials of deposits related to Early Mesozoic intrusive magmatism,the authors investigated the close relationship between magma mixing and mineralization during the Early Mesozoic vertical accretion process.The accretion was lateral accretion in the Middle Permian to Early Triassic subduction stage,and was vertical accretion in the middle to late Triassic collision and post-collision stage.The Middle-Late Triassic quartz diorite,granodiorite,monzogranite,syenogranite and granite porphyry formed with vertical accretion were related to the iron-copper-lead-zinc polymetallic mineralization,mainly Ⅰ-and A-type granites.The dark enclave and Sr-Nd-Hf isotopic compositions indicate a significant involvement of mantle components in petrogenesis.It is suggested that the middle-late Triassic intrusive rocks in Qimantag might have been formed by underplating,remelting of ancient crust and magma mixing in the Late Paleozoic to Early Mesozoic collision and post-collision stage.Main deposits related to Early Mesozoic magmatism include porphyry Cu-Mo deposits,skarn Fe-Cu-Pb-Zn polymetallic deposits,layered skarn Pb-Zn deposits and rare metal deposits related to alkaline granite.The metallogenic ages are from 248 Ma to 210 Ma,the ore-forming fluids were derived from magmatic hydrothermal activity,and the ore-forming materials came from both of the crust and the mantle.The magma mixing in Middle-Late Triassic period during the vertical accretion process provided large quantities of thermal energy,oreforming fluids and ore-forming materials for large-scale polymetallic mineralization.关键词
地质学/大陆增生/岩浆活动/铁铜铅锌多金属成矿作用/早中生代/祁漫塔格/东昆仑Key words
geology/continental accretion/magmatism/iron-copper-lead-zinc polymetallic mineralization/Early Mesozoic/Qimantag/East Kunlun Mountains分类
天文与地球科学引用本文复制引用
高永宝,李文渊,李侃,钱兵..东昆仑祁漫塔格早中生代大陆地壳增生过程中的岩浆活动与成矿作用[J].矿床地质,2017,36(2):463-482,20.基金项目
本文得到国家自然科学基金青年项目(编号:41102050)、陕西省自然科学基础研究计划项目(编号:2013JM5010)、陕西省科学技术研究发展计划项目(编号:2015KJXX-71)、中国地质调查局地质调查项目(编号:1212011121088、12120115019501、DD20160015、DD20160346)和中国地质调查局青年地质英才计划(2013)联合资助 （编号:41102050）
