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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摘要奥陶系-志留系之交斑脱岩分布广泛,且发育数层,是研究该时期地层年代学、地层对比、事件地层及生物大灭绝的良好载体. 通过对扬子板块西缘永善地区上奥陶统-下志留统龙马溪组底部地层中的斑脱岩进行锆石U-Pb测年,获得年龄加权平均值443.5±1.7 Ma,限定了地层的沉积年龄,为扬子板块西缘奥陶系-志留系火山喷发事件及地层年代学研究提供了较可靠的依据,也为扬子板块周缘奥陶系-志留系高分辨率地层格架的建立提供基础信息. 锆石微量元素特征显示其具有I型花岗岩类特征,形成于岩浆弧或造山带. 晚奥陶世-早志留世多期次、高频率的火山活动可能是造成生物大灭绝的主导因素.

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	王万能
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	于一帆

关键词 ：扬子板块, 斑脱岩, 锆石U-Pb年龄, 微量元素, 生物大灭绝

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

收稿日期: 2022-08-18

PACS:

P597

基金资助:中国地质调查局项目"滇中楚雄云龙镇等4幅1:5万区域地质调查"(DD20220987).

通讯作者: 王东晖(1995-),男,主要从事矿产地质调查工作,通信地址云南省昆明市西山区春雨路1566号,E-mail//122694975@qq.com E-mail: 122694975@qq.com

作者简介: 王万能(1995-),男,主要从事区域地质调查工作,通信地址云南省昆明市西山区春雨路1566号,E-mail//1922637474@qq.com

引用本文:

王万能, 庞占基, 王浩宇, 王东晖, 于一帆. 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[J]. 地质与资源, 2023, 32(6): 691-698.
WANG Wan-neng, PANG Zhan-ji, WANG Hao-yu, WANG Dong-hui, YU Yi-fan. 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. GEOLOGY AND RESOURCES, 2023, 32(6): 691-698.

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