浙江煤山D剖面二叠系长兴组高精度岩石地层

HIGH-RESOLUTION LITHOSTRATIGRAPHY OF THE CHANGHSINGIAN STAGE IN MEISHAN SECTION D,ZHEJIANG

基于对浙江煤山D剖面长兴组到下三叠统殷坑组岩石地层单元高精度的测量,选择了Yinetal.(1996)、盛金章等(1987)和赵金科等(1981)的地层资料,对比并修订了早期地层资料中的误差。重点标注了该剖面特殊岩性段,如黏土岩、碳酸盐化流纹质凝灰岩的产出层位,详尽描述了二叠系-三叠系界线附近的微观岩石地层特征,认为Y24e层顶部至Y27层为存在高度凝缩沉积或者沉积缺失的层段。这些高精度岩石地层材料将进一步推动二叠纪-三叠纪过渡期生物灭绝事件的后层型研究。

High-resolution lithostratigraphy has been attempted here to provide a detailed stratigraphic sequence of the Changhsingian Stage and the Lower Triassic in Meishan Section D. Previous stratigraphic data from Yin et al. (1996), Sheng et al. (1987) and Zhao et al. (1981) were compiled and revised with numerous errors in stratigraphic descriptions and thickness measurements corrected. Most importantly, the stratigraphic positions of the ash-beds and carbonatized tuff beds have been precisely measured. New microstratigraphic observation suggests that the Permian-Triassic transitional sequence at Meishan is a rather condensed or discontinuous at the uppermost part of Bed 24e and within Bed 27. Together with precise biostratigraphic data high-resolution lithostratigraphy will help us to improve our knowledge about the Permian-Triassic transition and the Permian-Triassic GSSP.