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Microbially Induced Carbonate Precipitation in a Middle Triassic Microbial Mat Deposit from Southwestern China: New Implications for the Formational Process of Micrite
Luo, Mao(罗茂)1,2,3; Chen, Jitao(陈吉涛)1,2; Qie, Wenkun (郄文昆)1,2; Huang, Jinyuan4,5; Zhang, Qiyue5; Zhou, Changyong5; Wen, Wen5
2021-06-01
Source PublicationJOURNAL OF EARTH SCIENCE
ISSN1674-487X
Volume32Issue:3Pages:633-645
Abstract

Lime mud (i.e., micrite) is a major component of carbonate deposits. Various mechanisms (biotic versus abiotic) have been proposed for the formation of lime mud in Earth's history. However, the detailed role that microbes play in the nucleation and subsequent precipitation of micrites remains to be resolved. Herein we undertook a detailed geobiological characterization of laminated lime mudstone from the Middle Triassic Guanling Formation in Yunnan Province, southwestern China. Morphological features, together with previous geobiological investigations, suggest that the laminated lime mudstones represent the former presence of microbial mats. These lime mudstones consist mainly of calcite, dolomite and quartz, with clay minerals and pyrites as subordinate components. In particular, micro-analysis shows copious nano-globules (65-878 nm) and capsule-shaped nano-rods in laminations. These low-Mg calcite nano-globule aggregates are closely associated with mucilaginous biofilms resembling extracellular polymeric substances (EPS). Nano-sized globules coalesce to form semi-euhedral micrite crystals. We suggest that a decaying hydrolytic destruction of the EPS by microbial communities within microbial mat leads to the precipitation of the nano-globules by enhancing alkalinity in local micro-environment. As an intermediate, these nano-globules further aggregate to form micrite crystals possibly through a dissolution-reprecipitation process.

Keywordnano-globule EPS micrite microbial mat Middle Triassic Luoping Biota
DOI10.1007/s12583-020-1075-6
Indexed BySCI
Language英语
WOS KeywordMARINE STROMATOLITES BAHAMAS ; SULFATE-REDUCING BACTERIA ; CALCIUM-CARBONATE ; LUOPING BIOTA ; YUNNAN PROVINCE ; GEOBIOLOGIC FEATURES ; LIME MUD ; EXCEPTIONAL PRESERVATION ; SPATIAL-DISTRIBUTION ; CYANOBACTERIAL MATS
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000658321900012
PublisherCHINA UNIV GEOSCIENCES, WUHAN
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38349
Collection中国科学院南京地质古生物研究所
Corresponding AuthorLuo, Mao(罗茂)
Affiliation1.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Ctr Excellence Life & Palaeoenvironm, Nanjing 210008, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Univ Geosci, Inst Geol Survey, Wuhan 430074, Peoples R China
5.Chengdu Ctr China Geol Survey, Chengdu 610081, Peoples R China
Recommended Citation
GB/T 7714
Luo, Mao,Chen, Jitao,Qie, Wenkun ,et al. Microbially Induced Carbonate Precipitation in a Middle Triassic Microbial Mat Deposit from Southwestern China: New Implications for the Formational Process of Micrite[J]. JOURNAL OF EARTH SCIENCE,2021,32(3):633-645.
APA Luo, Mao.,Chen, Jitao.,Qie, Wenkun .,Huang, Jinyuan.,Zhang, Qiyue.,...&Wen, Wen.(2021).Microbially Induced Carbonate Precipitation in a Middle Triassic Microbial Mat Deposit from Southwestern China: New Implications for the Formational Process of Micrite.JOURNAL OF EARTH SCIENCE,32(3),633-645.
MLA Luo, Mao,et al."Microbially Induced Carbonate Precipitation in a Middle Triassic Microbial Mat Deposit from Southwestern China: New Implications for the Formational Process of Micrite".JOURNAL OF EARTH SCIENCE 32.3(2021):633-645.
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