中国地质调查2026，Vol.13Issue(4)：47-58,12.DOI:10.19388/j.zgdzdc.2024.395
兴安地块南段蘑菇钦岩体地球化学及年代学特征:对古亚洲洋洋盆闭合时限的限定
Geochemical and chronological characteristics of Moguqin pluton in the southern Xing'an Block:Constraints on the closure timing of Paleo-Asian Ocean basin
摘要
Abstract
To reconstruct the Late Paleozoic tectonic evolution process of Xingmeng Orogenic Belt,Moguqin plu-ton in the southern segment of Xing'an Block was selected as the research object.The authors in this paper con-ducted zircon U-Pb dating and analyzed major,trace and rare earth element geochemical characteristics of the pluton,with a detailed investigation of its petrogenetic type and tectonic setting.The results showed that it was primarily composed of medium-grained alkali feldspar granite,with an emplacement age of(303.5±2.2)Ma,and it contained enclaves of syenite and diorite.The trace and rare earth element distribution curves of alkali feld-spar granite and syenite enclaves were consistent,showing characteristics of large ion lithophile element Rb,Th,K enrichment,and Sr,P,Ti depletion.The total rare earth content was medium to high,showing Eu negative a-nomaly.The genetic type of rock mass belonged to peraluminous(weakly peraluminous)A-type granite,while the diorite enclaves belongs to moderately differentiated intermediate rocks.The formation of Moguqin pluton was closely related to the evolution of Paleo-Asian Ocean,representing the magmatic activity of the extensional envi-ronment after the closing of Paleo-Asian Ocean basin.This research results are indicative of constraining the re-gional tectonic framework and could provide references for defining the closure timing of the Paleo-Asian Ocean basin.关键词
蘑菇钦岩体/A 型花岗岩/地球化学/洋盆闭合/古亚洲洋Key words
Moguqin pluton/A-type granite/geochemistry/the closing of ocean basin/Paleo-Asian Ocean分类
天文与地球科学引用本文复制引用
马承,李猛兴,孙华..兴安地块南段蘑菇钦岩体地球化学及年代学特征:对古亚洲洋洋盆闭合时限的限定[J].中国地质调查,2026,13(4):47-58,12.基金项目
中国地质调查局"1:5万额仁高壁公社幅(L50E011018)等四幅区调(编号:1212011120712)"项目资助. （L50E011018）
