地质与资源2026，Vol.35Issue(2)：150-158,201,10.DOI:10.13686/j.cnki.dzyzy.2026.02.003
内蒙古东乌旗阿尔哈达地区三叠纪花岗岩的成因及其构造意义
Petrogenesis and tectonic significance of the Triassic granites in Arhada area of Dong Ujimqin Qi,Inner Mongolia
摘要
Abstract
Through zircon LA-MC-ICP-MS U-Pb geochronology,Lu-Hf isotopes,and whole-rock geochemical analysis of the Binbalechagan granitic complex in Arhada area of southern Daxinganling Mountains,this study determines the emplacement age,magma source characteristics,and geodynamic setting of the granite to provide important constraints on the tectonic evolution of the eastern Xing'an-Mongolia orogenic belt.Zircon LA-MC-ICP-MS U-Pb dating results indicate that the Binbalechagan complex was formed by multiple magmatic intrusions during the Late Triassic(233-220 Ma),and is mainly composed of syenogranite and monzogranite.The in situ zircon Hf isotopic analyses of biotite syenogranite yieldεHf(t)values ranging from 7.8 to 14.5,with two-stage Hf model ages varying from 339 to 763 Ma.Geochemically,this complex is classified as weakly peraluminous,high-K calc-alkaline A-type granite.The primary magma originated from partial melting of juvenile continental crust,with possible addition of mantle-derived magma during emplacement.Combined with regional geological data,the Late Triassic Binbalechagan complex in Dong Ujimqin Qi area was formed in a post-orogenic extensional setting,and its geodynamic background may be related to the collision and amalgamation between the Xing'an block and Songliao block.关键词
三叠纪/花岗岩/锆石U-Pb定年/兴安地块/兴蒙造山带Key words
Triassic/granite/zircon U-Pb dating/Xing'an block/Xing'an-Mongolia orogenic belt分类
天文与地球科学引用本文复制引用
张阔,毕君辉,张博华,周红英,初航,耿建珍,李国占..内蒙古东乌旗阿尔哈达地区三叠纪花岗岩的成因及其构造意义[J].地质与资源,2026,35(2):150-158,201,10.基金项目
国家自然科学基金项目"金红石微区原位U-Pb定年标准物质的研制"(42473031),"跃进山增生杂岩中变质碎屑岩的锆石U-Pb年代学、Hf同位素组成及其地质意义"(42002065) （42473031）
中国地质调查局项目"豫西成矿带战略性矿产调查"(DD20240055). （DD20240055）
