地质通报2023，Vol.42Issue(11)：1909-1923,15.DOI:10.12097/j.issn.1671-2552.2023.11.009
阿尔金且末—若羌地区新元古代花岗质岩石成因及其对Rodinia超大陆汇聚时限的约束
Petrogenesis for Neoproterozoic granitic rocks in Altyn Qiemo-Ruoqiang area,and implications for determining the timing of Rodinia supercontinent's convergence
摘要
Abstract
The Neoproterozoic granitic magma activity was widespread in the Altyn orogenic belt,with formation ages around 800～1000 Ma.These magmatic events are thought to be associated with the convergence of the Rodinia supercontinent.Therefore,the study of Neoproterozoic granitic magma is of great significance for gaining insights into the evolution processes of the Altyn orogenic belt.In this study,we present precise results from petrological,geochronological and geochemical investigations of the granitic rocks from the Qiemo-Ruoqiang area in the southern Altyn block.Our findings indicate that:①In comparison to the enrichment of light rare earth elements(LREE),heavy rare earth elements(HREE)exhibit a pronounced right-leaning characteristic,accompanied by a distinct negative Eu anomaly(δEu=0.14～0.6).These rocks are enriched in large ion lithophile elements like Th,U,and K,while simultaneously showing depletion in high field strength elements such as Ba,Ti,Nb,Ta,and Sr.②Zircon U-Pb ages fall within the range of approximately 899 Ma to 915 Ma.Comprehensive studies have shown that the three categories of granitic rocks in the Qimo-Ruoqiang region were formed in a syn-collision tectonic environment,which were the products of subduction and collision between plates during the convergence stage of the Rodinia supercontinent.关键词
阿尔金造山带/花岗质岩石/U-Pb年龄/Rodinia超大陆/地质调查工程Key words
Altyn orogenic belt/granitic rocks/U-Pb geochronology/Rodinia supercontinent/geological survey engineering分类
天文与地球科学引用本文复制引用
靳胜凯,谢志远,李明军,刘博,冯永财..阿尔金且末—若羌地区新元古代花岗质岩石成因及其对Rodinia超大陆汇聚时限的约束[J].地质通报,2023,42(11):1909-1923,15.基金项目
中国地质调查局项目《阿尔金山西南且末—若羌一带1∶5万(J45E012013)、且末玉石矿(J45E012014)、(J45E013013)、肃拉穆塔格(J45E013014)幅区域地质矿产调查》(编号:DD2016007906)、《内蒙古化德-河北康保县德包图等4幅1∶5万区域地质调查项目》(编号:DD20208003)、《内蒙古化德—商都地区区域地质调查》(编号:DD20230251) （J45E012013）
