扬子板块西缘下志留统龙马溪组底部斑脱岩研究——锆石U-Pb测年、微量元素特征及地质意义

doi:10.13686/j.cnki.dzyzy.2023.06.005

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Abstract Bentonites are widely distributed and developed in several layers in the Ordovician-Silurian boundary, which is of great significance for the study of stratigraphic chronology, stratigraphic correlation, event stratigraphy and mass extinction in the period. The zircon U-Pb dating of bentonites in the bottom of Upper Ordovician-Lower Silurian Longmaxi Formation in Yongshan area on the western margin of Yangtze Plate yields the weighted average age of 443.5±1.7 Ma, which defines the sedimentary age of the strata and provides a reliable basis for the study of Ordovician-Silurian volcanic eruption event and stratigraphic chronology on the western margin of Yangtze Plate, as well as basic information for the establishment of Ordovician-Silurian high-resolution stratigraphic framework on the periphery of Yangtze Plate. The trace element characteristics of zircon show the features of I-type granite formed in magmatic arc or orogenic belt. The multi-stage and high-frequency volcanic activity in the Late Ordovician-Early Silurian is possibly the dominant factor causing the mass extinction.

Key words： Yangtze Plate bentonite zircon U-Pb age trace element mass extinction

Received: 18 August 2022

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P597

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	WANG Wan-neng
	PANG Zhan-ji
	WANG Hao-yu
	WANG Dong-hui
	YU Yi-fan

Cite this article:

WANG Wan-neng,PANG Zhan-ji,WANG Hao-yu等. BENTONITES IN THE BOTTOM OF LOWER SILURIAN LONGMAXI FORMATION ON THE WESTERN MARGIN OF YANGTZE PLATE: Zircon U-Pb Age, Trace Element Characteristics and Geological Implication[J]. GEOLOGY AND RESOURCES, 2023, 32(6): 691-698.

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http://manu25.magtech.com.cn/Jweb_dzyzy/EN/10.13686/j.cnki.dzyzy.2023.06.005 OR http://manu25.magtech.com.cn/Jweb_dzyzy/EN/Y2023/V32/I6/691

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