张广才岭北部早侏罗世花岗岩年代学、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20230177

Abstract

Abstract: In order to discuss the tectonic framework and evolution of the Northern Zhangguangcai Mountains, LA-MC-ICP-MS zircon U-Pb chronology, petrology, and petrogeochemistry studies were conducted on monzonitic granite, syenite granite and alkali-feldspar granite in this area. The zircon U-Pb ages of two monzonitic granites, one syenite granite, and one alkali feldspar granite are (191.4±1.1)Ma, (202.6±1.0)Ma, (190.8±1.5)Ma, and (198.1±1.0)Ma, respectively, in Early Jurassic. These granites are mainly classified as low aluminous, high potassium, and calc-alkaline series, have enrichment of large ion lithophile elements and lightly rare earth elements, like Rb, Ba, K, etc., whlie have depletion of high field strength elements and heavy rare earth elements, such as Nb, P, Ti, etc.. They exhibit characteristics of I-type granite, indicative of an active continental margin environment resulting from Paleo-Pacific plate subduction to Eurasia.

Key words: monzogranite, syenogranite, alkalifeldspar granite, zircon U-Pb age, petrogeochemistry, geochemistry, Nothern Zhangguangcai Mountains

CLC Number:

Yu Yuejiang, Zhao Zhonghai, Li Xinpeng, Ma Liling. Geochronology, Geochemistry and Geological Significance of Early Jurassic Granites in Nothern Zhangguangcai Mountains[J].Journal of Jilin University(Earth Science Edition), 2024, 54(4): 1224-1247.

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Geochronology, Geochemistry and Geological Significance of Early Jurassic Granites in Nothern Zhangguangcai Mountains

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