广西田东剖面二叠纪-三叠纪之交的生物绝灭及生态演化  

Organism Extinction and Ecology Evolution near the Boundary of Permian and Triassic in Tiandong,Guangxi Provience

作　　者：李军[1] 杨浩[1] 祁士华[2] 

机构地区：[1]中国地质大学(武汉)研究生院,武汉430074 [2]中国地质大学(武汉)环境学院,武汉430074

出　　处：《华南地质与矿产》2007年第4期50-55,共6页Geology and Mineral Resources of South China

基　　金：教育部地质学理科基地班基金;国家自然科学基金(批准号:40572002)联合资助

摘　　要：本文以广西田东地区浅海相二叠系-三叠系剖面为研究对象,对二叠纪-三叠纪之交的生物绝灭与浅海生态环境演化进行了深入的探讨。镜下化石鉴定与统计结果表明在P/T界线附近生物物种两次急剧减少,一次为生物大绝灭所致,另一次为生物迁徙所致。另外,本剖面上所研究的物种的数量变化是突变的,而不是渐变的。在残存期内,腹足类生物较有孔虫生物表现出较强的自我恢复和适应环境的能力。整个剖面沉积为一个海浸的过程,其二叠系-三叠系界线之交生态环境发生了很大的变迁。This research focuses on the Permian/Triassic section of shallow marine facies in Tiandong area Guangxi province in south China. It tries to have a through discussion of shallow marine organism extinction and ecological evolution near the boundary of Permian and Triassic. The fossil identification and statistics in cross - microscope suggest that there are two organism sharp decrease near the Permian and Triassic boundary, one decrease is the result of a organism extinction; Another is the result of a organism migration. The extinction is not change gradually but it change suddenly. In the survival period, Gastropoda has stronger ability of self - recovering and adapting to environment than foraminiferida. The entire section deposition is a process which a sea soaks. At the same time, the sedimentary and ecological environment suffers from a strong variation near the boundary of Permian and Triassic.

关 键 词：二叠系-三叠系 生物绝灭 古生态 微生物岩 

分 类 号：P534.46[天文地球—古生物学与地层学] P534.51[天文地球—地质学]