宜昌界岭地区Tremadocian早期微生物成因构造的发现

曾雄伟; 徐子一; 王建坡; 程龙; 王传尚; 王志宏

doi:10.12029/gc20200606005

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

摘要

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。

Abstract:
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.

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