地质科技情报2012，Vol.31Issue(1)：16-21,6.
湖北崇阳二叠纪—三叠纪之交生物灭绝和沉积微相演化
Mass Extinction and Evolution of Sedimentary Microfacies Across the Permian-Triassic Boundary in Chongyang, Hubei Province
摘要
Abstract
Chongyang was located on shallow carbonate platform during the Permian-Triassic transition, where the end-Permian global event of biotic crisis was highly marked both on fossil record and sedimentary facies. Before the end-Permian mass extinction, abundant and diverse species, such as fusulinds, calcareous alga, calcisponges, echinoderms, lived in a normal shallow marine environment. However, microgas-tropods, ostracods and abundant calcified cyanobacteria replaced these Permian species after the big crisis. A thickness of 25 cm laminated microbialites sharply overlaps on Permian packstone in Chongyang, and next are 6. 4 m thrombolites and 2. 3 m dome microbialites. Different types of microbialites have different sedimentary structures and biological compositions. Oolitic limestones began to deposit after the termination of microbialites. Three sedimentary facies are concluded according to the five sedimentary microfacies above, which are open platform facies, tidal-flat facies and platform edge shallow facies. The mass extinction and change of sedimentary facies in Chongyang section typically stand for the interaction between creatures and environment on shallow carbonate platform across the Permian-Triassic boundary. Hence, this study offers new information for studying the end-Permian global event.关键词
钙质微生物岩/生物灭绝/沉积微相/二叠纪—三叠纪/崇阳Key words
calcimicrobialite/mass extinction/sedimentary microfacies/Permian-Triassic/Chongyang分类
天文与地球科学引用本文复制引用
单厚香,王永标,何磊,余黎雪..湖北崇阳二叠纪—三叠纪之交生物灭绝和沉积微相演化[J].地质科技情报,2012,31(1):16-21,6.基金项目
国家自然科学基金项目(40730209) （40730209）
国家大学生创新性实验计划项目(091049105) （091049105）
中国地质大学(武汉)教学实验室开放基金项目(SKJ2011005) （武汉）
