河南宜阳地区陆相二叠系—三叠系界线附近微生物成因沉积构造特征及意义  

Characteristic and Geological Significance of Microbially Induced Sedimentary Structures(MISS) in Terrestrial P—T Boundary in Western Henan

作　　者：张利伟[1,2] 杨文涛[1] 牛永斌[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]中国地质科学院地质研究所,北京100037

出　　处：《地质论评》2014年第5期1051-1060,共10页Geological Review

基　　金：国家自然科学基金资助项目(编号U1204404;41102076);中国地质调查局"全国陆相地层划分对比及海相地层阶完善"(编号1212011120142)地质调查工作项目;河南理工大学博士基金资助项目(编号B2011-094)的成果

摘　　要：有关微生物成因沉积构造及其生物地质过程的研究近年来发展迅速,成为深刻认识地球早期生命演化以及生物与环境相互作用过程的重要桥梁。目前报道的微生物成因沉积构造主要集中在海相沉积中,而陆相碎屑岩沉积中的微生物成因沉积构造研究较少。本文介绍了河南省宜阳地区二叠系—三叠系界线附近陆相碎屑岩中发育的以微生物席生长特征、微生物席破坏特征为主的微生物成因沉积构造,认为这些沉积构造的发育与二叠纪末地质灾变事件造成的特殊水体化学环境和严重退化的生态系统相关,属陆相环境中的"错时相"沉积。研究区微生物成因沉积构造的发现对于二叠纪末地质灾变期生物绝灭与复苏奥秘的探索、陆相地层的划分、海相—陆相地层的对比均具有重要意义。In recent years,many studies on microbially induced sedimentary structures （MISS） and related biogeological processes have been carried out,and become an important way to understand the evolution of early life and interactions between organisms and environments.However,most reports have focussed on the Mesoproterozoic—Neoproterozoic marine sediments,only a few Phanerozoic and terrestrial MISS have been researched.The MISS presented in this paper,mainly consist of mat growth features and mat destruction features,are well preserved in terrestrial clastic rocks around the P—T boundary in Yiyang area,Henan Province.MISS nearby the P—T boundary in this area might indicate that unusual sedimentary rock records of unique aquatic chemical environment and degradation ecosystem after the late Permian biological extinction events.They can be named as ＂terrestrial anachronistic facies＂.MISS＇s exploration in P—T boundary in the terrestrial environment is meaningful to understand the ecosystem after the mass extinction,and useful for stratigraphical classification and correlation.

关 键 词：微生物成因沉积构造 二叠系—三叠系界线 陆相沉积 生物绝灭与复苏 错时相 

分 类 号：P512.2[天文地球—地质学] P512.5