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Influence of palaeo-redox and diagenetic conditions on the spatial distribution of Cambrian biotas: A case study from the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3), Three Gorges area of South China
Zhang, Lei1,2; Chang, Shan1,2; Khan, Maliha Zareen2; Feng, Qinglai1,2; Luo, Cui (罗翠)3; Steiner, Michael4; Forel, Marie-Beatrice5; Liu, Kai1,2; Clausen, Sebastien6
2020-06-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume548Pages:21
Abstract

From the wake of the Marinoan glaciations to the early Cambrian, the global ocean experienced progressive but likely nonuniform and nonlinear oxygenation to levels that, although still low with respect to the modern ocean, and might be therefrom triggered the ecological expansion of animals. In this study, integrated palaeontological and geochemical analyses were conducted on the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3) which outcrops western Yichang City, Hubei Province, South China, in order to assess the influence of oxygen on Cambrian ecosystem diversification in the local environment. To better understand the oxygen fluctuations in the water column over the Yangtze Block and their correlation with the spatial distributions of marine biota during the early Cambrian, three sections representing different environmental settings are investigated: from the carbonate epicontinental platform (Changkan section) to the intra-platform basin (Luojiacun and Qiaojiaping sections). The semi-quantitative analysis shows that the assemblages from the epicontinental platform are dominated by eodiscoid trilobites and brachiopods. Assemblages from the intra-platform basin differ in being dominated by articulated sponges and possible cnidarians, while brachiopods and trilobites are rare. Diagenetic effects on these observed patterns are assessed by SEM-coupled EDS analysis: they indicate that although such effects cannot be definitely discarded, the observed faunal distribution and relative abundance most probably reflect variations in environmental settings. The geochemical analysis (Mo-EF vs. U-EF) furthermore provides evidence of an oxygen gradient from the edge of the platform down to the intra-platform basin. Variations in palaeo-redox conditions between the different studied settings can be observed, which undoubtedly influenced the observed differentiation of benthic communities. Frequent anoxic events in the intra-platform basin were fatal for benthic communities, but dysoxic environments could have favored the persistence and even prosperity of metazoans such as sponges and possible cnidarians that can endure lower dissolved oxygen in the water column than other groups.

KeywordCambrian Explosion Metazoans Fossilization Oxygenation gradient Yangtze platform
DOI10.1016/j.palaeo.2020.109696
Indexed BySCI
Language英语
WOS KeywordPHYLLOPOD BED COMMUNITY ; YANGTZE PLATFORM ; BURGESS SHALE ; CHENGJIANG BIOTA ; BLACK SHALES ; OXYGEN REQUIREMENTS ; PALEO-OXYGENATION ; OCEAN OXYGENATION ; SEDIMENTARY-ROCKS ; ANIMAL EVOLUTION
Funding ProjectNSFC[41972024] ; NSFC[41430101] ; NSFC[41502014] ; Spanish Ministry of Economics, Finance and Competitiveness[CGL2017-87631-P]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000528271600003
Funding OrganizationNSFC ; Spanish Ministry of Economics, Finance and Competitiveness
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/31819
Collection中国科学院南京地质古生物研究所
Corresponding AuthorFeng, Qinglai
Affiliation1.China Univ Geosci, Sch Earth Sci, Wuhan, Peoples R China
2.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
3.Nanjing Inst Geol & Palaeontol, CAS Key Lab Econ Stratig & Palaeogeog, 39 East Beijing Rd, Nanjing 210008, Peoples R China
4.Free Univ Berlin, Dept Earth Sci, Malteserstr 74-100,Haus D, D-12249 Berlin, Germany
5.MNHN CNRS Sorbonne Univ, Ctr Rech Paleontol Paris, Museum Natl Hist Nat, CNRS,UMR7207, 8 Rue Buffon CP38, F-75005 Paris, France
6.Univ Lille, CNRS, UMR Evo Eco Paleo 8198, F-59000 Lille, France
Recommended Citation
GB/T 7714
Zhang, Lei,Chang, Shan,Khan, Maliha Zareen,et al. Influence of palaeo-redox and diagenetic conditions on the spatial distribution of Cambrian biotas: A case study from the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3), Three Gorges area of South China[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2020,548:21.
APA Zhang, Lei.,Chang, Shan.,Khan, Maliha Zareen.,Feng, Qinglai.,Luo, Cui .,...&Clausen, Sebastien.(2020).Influence of palaeo-redox and diagenetic conditions on the spatial distribution of Cambrian biotas: A case study from the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3), Three Gorges area of South China.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,548,21.
MLA Zhang, Lei,et al."Influence of palaeo-redox and diagenetic conditions on the spatial distribution of Cambrian biotas: A case study from the upper Shuijingtuo Formation (Cambrian Series 2, Stage 3), Three Gorges area of South China".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 548(2020):21.
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