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Late Anisian microbe-metazoan build-ups in the Germanic Basin: aftermath of the Permian-Triassic crisis
Pei, Yu1; Duda, Jan-Peter2; Schoenig, Jan3; Luo, Cui(罗翠)4,5; Reitner, Joachim1,6
2021-07-21
Source PublicationLETHAIA
ISSN0024-1164
Pages22
Abstract

The so-called Permian-Triassic mass extinction was followed by a prolonged period of ecological recovery that lasted until the Middle Triassic. Triassic stromatolites from the Germanic Basin seem to be an important part of the puzzle but have barely been investigated so far. Here, we analysed late Anisian (upper Middle Muschelkalk) stromatolites from across the Germanic Basin by combining petrographic approaches (optical microscopy, micro X-ray fluorescence, Raman imaging) and geochemical analyses (sedimentary hydrocarbons, stable carbon and oxygen isotopes). Palaeontological and sedimentological evidence, such as Placunopsis bivalves, intraclasts and disrupted laminated fabrics, indicate that the stromatolites formed in subtidal, shallow marine settings. This interpretation is consistent with delta C-13(carb) of about -2.1 parts per thousand to -0.4 parts per thousand. Occurrences of calcite pseudomorphs after gypsum possibly suggest occasionally elevated salinities, which is well in line with the relative rarity of fossils in the host strata. Remarkably, the stromatolites are composed of microbes (perhaps cyanobacteria and sulphate-reducing bacteria) and metazoans such as non-spicular demosponges, Placunopsis bivalves and/or microconchids. Therefore, these 'stromatolites' should more correctly be referred to as microbe-metazoan build-ups. They are characterized by diverse lamination types, including planar, wavy, domal and conical ones. Microbial mats likely played an important role in forming the planar and wavy laminations. Domal and conical laminations commonly show clotted to peloidal features and mesh-like fabrics, attributed to fossilized non-spicular demosponges. Our observations not only point up that non-spicular demosponges are easily overlooked and might be mistakenly interpreted as stromatolites, but also demonstrate that microbe-metazoan build-ups were widespread in the Germanic Basin during Early to Middle Triassic times. In the light of our findings, it appears plausible that the involved organisms benefited from elevated salinities. Another (not necessarily contradictory) possibility is that the mutualistic relationship between microbes and non-spicular demosponges enabled these organisms to fill ecological niches cleared by the Permian-Triassic crisis. If that is to be the case, it means that such microbe-metazoan associations maintained their advantage until the Middle Triassic.

KeywordEcological recovery microbialite Middle Muschelkalk non-spicular ('keratose') demosponges Permian-Triassic mass extinction stromatolite
DOI10.1111/let.12442
Indexed BySCI
Language英语
WOS KeywordSOUTH CHINA ; DENGYING FORMATION ; STROMATOLITES ; SPONGES ; CARBONATES ; MICROBIALITES ; EVOLUTION ; BOUNDARY ; DEMOSPONGIAE ; COMMUNITIES
Funding ProjectChina Scholarship Council
WOS Research AreaPaleontology
WOS SubjectPaleontology
WOS IDWOS:000675108700001
Funding OrganizationChina Scholarship Council
PublisherWILEY
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38418
Collection中国科学院南京地质古生物研究所
Corresponding AuthorReitner, Joachim
Affiliation1.Georg August Univ Gottingen, Geosci Ctr, Dept Geobiol, Goldschmidtstr 3, D-37077 Gottingen, Germany
2.Eberhard Karls Univ Tubingen, Dept Geosci, Sedimentol & Organ Geochem Grp, Schnarrenbergstr 94-96, D-72076 Tubingen, Germany
3.Georg August Univ Gottingen, Geosci Ctr, Dept Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany
4.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, 39 East Beijing Rd, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, 39 East Beijing Rd, Nanjing 210008, Peoples R China
6.Gottingen Acad Sci & Humanities, Origin Life Grp, Theater Str 7, D-37073 Gottingen, Germany
Recommended Citation
GB/T 7714
Pei, Yu,Duda, Jan-Peter,Schoenig, Jan,et al. Late Anisian microbe-metazoan build-ups in the Germanic Basin: aftermath of the Permian-Triassic crisis[J]. LETHAIA,2021:22.
APA Pei, Yu,Duda, Jan-Peter,Schoenig, Jan,Luo, Cui,&Reitner, Joachim.(2021).Late Anisian microbe-metazoan build-ups in the Germanic Basin: aftermath of the Permian-Triassic crisis.LETHAIA,22.
MLA Pei, Yu,et al."Late Anisian microbe-metazoan build-ups in the Germanic Basin: aftermath of the Permian-Triassic crisis".LETHAIA (2021):22.
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