WEN Y J, LI X, LI Q C, et al.Characteristics and tectonic significance of the Devonian magmatite in Shanghai Area，eastern Yangtze Block[J].Journal of Henan Polytechnic University(Natural Science) ,2022,41(5):46-57.

doi:10.16186/j.cnki.1673-9787.2020080086

Received:2020/08/28

Revised:2020/10/16

Published:2022/09/25

Characteristics and tectonic significance of the Devonian magmatite in Shanghai Area，eastern Yangtze Block

WEN Yijie1, LI Xue2, LI Qianchao1, WANG Yonghao3, YANG Siyi3, GUO Han1, ZHANG Zhiwei4, QIU Liang3, YAN Danping3

1.School of Energy，China University of Geosciences（Beijing），Beijing  100083，China；2.Shanghai Geological Engineering Exploration（Group） Co.，Ltd.，Shanghai  200072，China；3.School of Earth Sciences and Resources，China University of Geosciences（Beijing），Beijing  100083，China；4.Cores and Samples Center of Nature Resources，China Geological Survey，Langfang  065201，Hebei，China

Abstract:In order to reveal the characteristics of early Paleozoic magmatism in the Yangtze Block and to determine the scope of influence of the Caledonian tectonic events，the andesites from drill cores in Shanghai Area were identified by microscopy，the zircons incorporated in were separated and then imaged by cathodoluminescence（CL）.The CL images showed prismatic and pyramidal crystal forms and magmatic oscillatory，indicating an igneous origin.The zircons yielded a weighted mean U-Pb age of（410.5±1.8）Ma.Furthermore，the geochemistry of the zircons indicated a continental origin.Therefore，It was proposed that the newly discovered Devonian andesite had an affinity of post-orogenic extension of the early Paleozoic orogen.

Key words:Shanghai Area;Devonian;magmatic rock;Caledonian tectonic event;geochronology

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