宜昌界岭地区Tremadocian早期微生物成因构造的发现  

Discovery of microbially induced sedimentary structures of Early Tremadocian in Jieling area,Yichang,Hubei Province

作　　者：曾雄伟 徐子一 王建坡 程龙 王传尚 王志宏 ZENG Xiongwei;XU Ziyi;WANG Jianpo;CHENG Long;WANG Chuanshang;WANG Zhihong(Wuhan Center of China Geological Survey(Geological Science and Technology Innovation Center of Central South China),Wuhan 430205,Hubei,China;Hubei Key Laboratory of Paleontology and Geological Environment Evolution,Wuhan 430205,Hubei,China;Yichang Geological Environment Monitoring Station,Yichang 443002,Hubei,China)

机构地区：[1]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205 [2]古生物与地质环境演化湖北省重点实验室,湖北武汉430205 [3]宜昌市地质环境监测站,湖北宜昌433002

出　　处：《中国地质》2024年第5期1727-1734,共8页Geology in China

基　　金：中国地质调查局项目(DD20230218、DD20190823、DD20190315)资助。

摘　　要：【研究目的】微生物成因构造(MISS)是国际研究热点之一。中国地质学家较多关注前寒武纪的MISS,而较少研究其他时期的该类构造。奥陶纪早期微生物的繁盛是全球性的,但MISS此前仅见于法国和加拿大纽芬兰等地的浅水碎屑岩,中国目前尚无报道。【研究方法】通过野外调查和剖面测量,本文首次在宜昌界岭地区早奥陶世Tremadocian早期地层(南津关组上部)中发现微生物成因构造。【研究结果】宜昌界岭地区的微生物成因构造主要为微生物席生长构造和微生物席破坏构造。其中值得注意的是,微生物席破坏构造与广泛发育于前寒武纪的臼齿构造形态上具有相似性。【结论】该MISS的发现,不仅丰富了全球含MISS的地层单元,也对显生宙微生物岩研究具有重要理论意义。这一发现也是对宜昌市地质遗迹的重要补充。This paper is the result of geological survey engineering.[Objective]Microbially induced sedimentary structures(MISS),one of the international research hotspots,have been paid more attentions in Precambrian rather than other period in China.Microbials flourished globally in the Early Ordovician.However,the MISS was found in the shallow water clastic rocks in France and Newfoundland of Canada,but not yet reported in China.[Methods]Here,we first discovered the MISS at the upper Nantsinkuan Formation of Early Tremadocian of Early Ordovician in Jieling area,Yichang,Hubei Province.[Results]The MISS at Jieling contained microbial mat growth features and microbial mat destruction features.It is noteworthy that the microbial mat destruction features are morphologically similar to the molar tooth that widely developed in Precambrian.[Conclusions]The discovery of the MISS in Jieling not only enriches the global MISS−bearing stratigraphic units,but also has important theoretical significance for the study of Phanerozoic microbialites.Moreover,it is an important supplement to the geological relics of Yichang City.

关 键 词：微生物成因构造 Tremadocian早期 地质遗迹 南津关组 地质调查工程 宜昌 湖北 

分 类 号：Q911.6[天文地球—古生物学与地层学]