Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China

Abstract This study is the first systematic assessment of the Lower Ordovician microbial carbonates in Songzi, Hubei Province, China. This paper divides the microbial carbonates into two types according to growth patterns, namely nongranular and granular. The nongranular types include stromatolites,...

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Autores principales:	Chuan-Tao Xiao, Guo-Qi Wei, Zhen-Yu Song, Yun-Peng Xiao, Wei Yang, Man Dong, Yun-Fei Huang, Da Gao
Formato:	article
Lenguaje:	EN
Publicado:	KeAi Communications Co., Ltd. 2019
Materias:	Microbial carbonate Stromatolites Thrombolites Oncolite Lower Ordovician Songzi Area Science Q Petrology QE420-499
Acceso en línea:	https://doaj.org/article/9bd271979cd14b2ab6230de5e1f35ae7
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spelling	oai:doaj.org-article:9bd271979cd14b2ab6230de5e1f35ae72021-12-02T11:04:07ZPetrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China10.1007/s12182-019-0346-21672-51071995-8226https://doaj.org/article/9bd271979cd14b2ab6230de5e1f35ae72019-08-01T00:00:00Zhttp://link.springer.com/article/10.1007/s12182-019-0346-2https://doaj.org/toc/1672-5107https://doaj.org/toc/1995-8226Abstract This study is the first systematic assessment of the Lower Ordovician microbial carbonates in Songzi, Hubei Province, China. This paper divides the microbial carbonates into two types according to growth patterns, namely nongranular and granular. The nongranular types include stromatolites, thrombolites, dendrolites, leiolites and laminites; the granular types are mainly oncolites and may include a small amount of microbiogenic oolite. According to their geometric features, the stromatolites can be divided into four types: stratiform, wavy, columnar and domal. Additionally, dipyramidal columnar stromatolites are identified for the first time and represent a new type of columnar stromatolite. The thrombolites are divided into three types: speckled, reticulated and banded. The grazing gastropod Ecculiomphalus and traces of bioturbation are observed in the speckled and reticulated thrombolites. This paper considers these two kinds of thrombolites to represent bioturbated thrombolites. These findings not only fill gaps in the field of domestic Ordovician bioturbated thrombolites but also provide new information for the study of thrombolites. Based on the analysis of the sedimentary characteristics of microbialites, the depositional environments of the various types of microbialites are described, and the distribution patterns of their depositional environments are summarized. The relationship between the development of microbialites and the evolution and radiation of metazoans during the Early to Middle Ordovician is discussed. Consistent with the correspondence between the stepwise and rapid radiation of metazoans and the abrupt reduction in the number of microbialites between the late Early Ordovician and the early Middle Ordovician, fossils of benthonic grazing gastropods (Ecculiomphalus) were found in the stromatolites and thrombolite of the study area. It is believed that the gradual reduction in microbialites was related to the rapid increase in the abundance of metazoans. Grazers not only grazed on the microorganisms that formed stromatolites, resulting in a continuous reduction in the number of stromatolites, but also disrupted the growth state of the stromatolites, resulting in the formation of unique bioturbated thrombolites in the study area. Hydrocarbon potential analysis shows that the microbialites in the Nanjinguan Formation represent better source rocks than those in the other formations.Chuan-Tao XiaoGuo-Qi WeiZhen-Yu SongYun-Peng XiaoWei YangMan DongYun-Fei HuangDa GaoKeAi Communications Co., Ltd.articleMicrobial carbonateStromatolitesThrombolitesOncoliteLower OrdovicianSongzi AreaScienceQPetrologyQE420-499ENPetroleum Science, Vol 16, Iss 5, Pp 956-971 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Microbial carbonate Stromatolites Thrombolites Oncolite Lower Ordovician Songzi Area Science Q Petrology QE420-499
spellingShingle	Microbial carbonate Stromatolites Thrombolites Oncolite Lower Ordovician Songzi Area Science Q Petrology QE420-499 Chuan-Tao Xiao Guo-Qi Wei Zhen-Yu Song Yun-Peng Xiao Wei Yang Man Dong Yun-Fei Huang Da Gao Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
description	Abstract This study is the first systematic assessment of the Lower Ordovician microbial carbonates in Songzi, Hubei Province, China. This paper divides the microbial carbonates into two types according to growth patterns, namely nongranular and granular. The nongranular types include stromatolites, thrombolites, dendrolites, leiolites and laminites; the granular types are mainly oncolites and may include a small amount of microbiogenic oolite. According to their geometric features, the stromatolites can be divided into four types: stratiform, wavy, columnar and domal. Additionally, dipyramidal columnar stromatolites are identified for the first time and represent a new type of columnar stromatolite. The thrombolites are divided into three types: speckled, reticulated and banded. The grazing gastropod Ecculiomphalus and traces of bioturbation are observed in the speckled and reticulated thrombolites. This paper considers these two kinds of thrombolites to represent bioturbated thrombolites. These findings not only fill gaps in the field of domestic Ordovician bioturbated thrombolites but also provide new information for the study of thrombolites. Based on the analysis of the sedimentary characteristics of microbialites, the depositional environments of the various types of microbialites are described, and the distribution patterns of their depositional environments are summarized. The relationship between the development of microbialites and the evolution and radiation of metazoans during the Early to Middle Ordovician is discussed. Consistent with the correspondence between the stepwise and rapid radiation of metazoans and the abrupt reduction in the number of microbialites between the late Early Ordovician and the early Middle Ordovician, fossils of benthonic grazing gastropods (Ecculiomphalus) were found in the stromatolites and thrombolite of the study area. It is believed that the gradual reduction in microbialites was related to the rapid increase in the abundance of metazoans. Grazers not only grazed on the microorganisms that formed stromatolites, resulting in a continuous reduction in the number of stromatolites, but also disrupted the growth state of the stromatolites, resulting in the formation of unique bioturbated thrombolites in the study area. Hydrocarbon potential analysis shows that the microbialites in the Nanjinguan Formation represent better source rocks than those in the other formations.
format	article
author	Chuan-Tao Xiao Guo-Qi Wei Zhen-Yu Song Yun-Peng Xiao Wei Yang Man Dong Yun-Fei Huang Da Gao
author_facet	Chuan-Tao Xiao Guo-Qi Wei Zhen-Yu Song Yun-Peng Xiao Wei Yang Man Dong Yun-Fei Huang Da Gao
author_sort	Chuan-Tao Xiao
title	Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
title_short	Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
title_full	Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
title_fullStr	Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
title_full_unstemmed	Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China
title_sort	petrography and origin of the lower ordovician microbial carbonates in the songzi area of hubei province, middle yangtze region, china
publisher	KeAi Communications Co., Ltd.
publishDate	2019
url	https://doaj.org/article/9bd271979cd14b2ab6230de5e1f35ae7
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Petrography and origin of the Lower Ordovician microbial carbonates in the Songzi Area of Hubei Province, middle Yangtze region, China

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