黑龙江漠河地区早古生代早期花岗岩的厘定及其地质意义

doi:10.13278/j.cnki.jjuese.20200110

Abstract

Abstract: The Shabaosidong pluton located 5 km east of the Shabaosi gold deposit in Mohe area, Heilongjiang Province, is a newly discovered Early Paleozoic granitic intrusion in the Northern Great Xing’an Range. In this paper, LA-ICP-MS zircon U-Pb dating, major and trace elements, and isotope geochemistry were carried out. Zircon U-Pb dating results indicate that the formation age of the intrusion is (509±4) Ma. The pluton has high SiO2=66.20%-71.83%, Al2O3=14.61%-15.08%, K2O+Na2O=6.37%-8.10%, and belongs to weak peraluminum, high potassium and calcium alkaline series. It also shows enrichment in light rare earth elements, large-ion lithophile elements (Rb) and high field strength elements (Th and U), depletion in heavy rare earth elements, high field-strength elements and large-ion lithophile elements (Ba and Sr). The zircon εHf(t) values range from 2.7 to 5.6 and the two-stage model age is 1.3 to 1.1 Ga. The Shabaosidong granite was formed in a post-collisional orogenic tectonic environment and was the products of partial melting of the juvenile lower crust.

Key words: Early Paleozoic, granite, Northern Great Xing’an Range, zircon U-Pb dating, geochemistry

CLC Number:

P588.1

Zhang Dongdong, Gao Yang, Liu Jun, He Juncheng. Determination and Geological Significance of Early Paleozoic Granites in Mohe Area, Heilongjiang Province[J].Journal of Jilin University(Earth Science Edition), 2022, 52(6): 1926-1945.

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Determination and Geological Significance of Early Paleozoic Granites in Mohe Area, Heilongjiang Province

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