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