小兴安岭平顶山一带早侏罗世花岗岩类年代学、地球化学特征及其地质意义

doi:10.13278/j.cnki.jjuese.20190260

Abstract

Abstract: Lesser Xing'an Range is located in the eastern section of Xing-Meng orogenic belt, and belongs to Songnen block. The zircon U-Pb geochronology and rock geochemistry of the alkali feldspar granite and syenite granite in Pingdingshan area of Lesser Xing'an Range were studied to determine their formation age, rock genesis, and tectonic setting. The dating data show that the alkali feldspar granite was formed in (189±3) Ma,and the syenite granite was formed in (191±3) Ma, which is the product of the evolution of the Early Jurassic magmatic event. The geochemical results show that the rocks are characterized by high silicon (75.00%-77.60%), rich alkali(7.13%-9.00%), poor magnesium (0.05%-0.45%), poor calcium (0.17%-1.10%), low phosphorus (0.01%-0.07%) and titanium (0.09%-0.23%), and A/CNK (0.94-1.17), belonging to metal aluminous-weak peraluminous high-K calcium-alkaline series. The rocks are poor in high field strength elements Nb, P, Ti, Ta and large ion-lithophile elements Ba, Sr, while rich in Rb, K, Th, Hf and other elements. The total amount of rare earth elements is (38.76-297.13)×10^-6. The REEs distribution curve shows that the light rare earth elements are slightly enriched, and the heavy rare earth elements are gently inclined to the right with obvious negative Eu anomaly. The zircon saturation temperature and geochemical characteristics show that the rocks are highly differentiated Type I granites. Based on the tectonic evolution characteristics of Lesser Xing'an Range, the Early Jurassic granites in the study area are the products the collision and amalgamation of Songnen block and Jiamusi block along the Jiayin-Mudanjiang suture zone, and the magma was originated from the partial melting of igneous material in the lower crust.

Key words: granite rock, Type I granite, zircon U-Pb chronology, rock geochemistry, Lesser Xing’an Range

CLC Number:

P581.12

Yin Zhigang, Gong Zhaomin, Wang Chunsheng, Liu Songjie, Zhang Shengting, Wang Guanqun, Zhou Xiaogang, Zhang Zhihao. Chronological, Geochemical Characteristics and Geological Significance of Early Jurassic Granites in Pingdingshan Area of Lesser Xing'an Range[J].Journal of Jilin University(Earth Science Edition), 2021, 51(1): 107-125.

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Chronological, Geochemical Characteristics and Geological Significance of Early Jurassic Granites in Pingdingshan Area of Lesser Xing'an Range

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