Records of Mesozoic-Cenozoic Collision Orogenic Events on the Western Margin of the Yangtze Platform:Geochronology Evidence from Zircon U-Pb Isotope of Emeishan Basalt

doi:10.19657/j.geoscience.1000-8527.2021.107

Abstract

Abstract:

Using LA-ICP-MS technique,the U-Pb isotope determination of zircons in the Emeishan basalts in Tangdian, of eastern Yunnan on the western margin of the Yangtze Plate is carried out. The distribution range of 363 age data is (14.9±0.6)-(3,023±50) Ma, spanning a long geological age, its 11 age peaks are 750~850 Ma, ~450 Ma, ~275 Ma, ~260 Ma, ~247 Ma, ~215 Ma, ~160 Ma, ~120 Ma, ~100 Ma, ~52 Ma and ~35 Ma, respectively, reflecting that Emeishan basalt experienced the contamination of crustal materials in the formation process, and being affected by later tectonic thermal events. The first and second sub-circle of the Emeishan basalt were formed at (259.9±3.2) Ma and (259.2±3.6) Ma, respectively. The zircon ages of the basalts of ~275 Ma may represent the age of the formation age of Emeishan basalt magma chamber and the time when the crust began to uplift due to Emei mantle plume event.After the formation of the Emeishan basalt, the western margin of the Yangtze Plate experienced successively tectonic thermal events of ~247 Ma, ~215 Ma, ~160 Ma, ~120 Ma, ~100 Ma, ~52 Ma, and ~35 Ma. These age data are the time records of the Mesozoic Cenozoic collision orogenic event reaching the peak of temperature and pressure on the western margin of the Yangtze Plate.

Key words: Emeishan basalt, zircon U-Pb age, collision orogeny, west margin of Yangtze Plate, LA-ICP-MS

CLC Number:

P542
P597

ZHANG Honghui, YUAN Yongsheng, YU Yangzhong, LI Hong, ZHANG Liyuan, LI Zhiwei, GUO Taitang, PAN Jiangtao, ZHAN Huasi, SHI Haitao. Records of Mesozoic-Cenozoic Collision Orogenic Events on the Western Margin of the Yangtze Platform:Geochronology Evidence from Zircon U-Pb Isotope of Emeishan Basalt[J]. Geoscience, 2021, 35(05): 1155-1177.

Figures/Tables 6

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