Role and lifestyle of calcified cyanobacteria (Stanieria) in Permian–Triassic boundary microbialites

Wu, Yasheng; Yu, Ge; Jiang, Hongxia; Liu, Li-Jing; Zhao, Rui

doi:10.1016/j.palaeo.2015.11.019

Cited by 21 publications

(12 citation statements)

References 35 publications

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“…That crisis wiped out many of those benthic organisms that adapted to normal, shallow marine environments, whilst some anoxia-or high-temperature-tolerant organisms survived and even flourished in the harsh conditions, spreading into newly available ecological niches. Like other reported Early Triassic microbialites Liu et al 2010;Yang et al 2011;Crasquin and Forel 2014;Wu et al 2016), the metazoan fossils in this unit at Panjiazhuang section are dominated by ostracods, small gastropods and microconchid tubes ( Fig. 6).…”

Section: Early Triassic Microbialitessupporting

confidence: 75%

“…The diameter of a single coccoid is about 30-40 μm, and assemblages of several coccoid microfossils appear in clusters. Similar spherical microfossils were also reported from the Laolongdong section in Chongqing, where they were compared to the extant epiphytic cyanobacterium Stanieria (Wu et al 2016).…”

Section: Early Triassic Microbialitessupporting

confidence: 74%

“…Permian-Triassic boundary (PTB) microbialites exist in various forms, including stromatolites, thrombolites and dendrolites (Wang et al 2019, and references therein). Most PTB microbialites are formed from calcified cyanobacteria, and also include miniaturized gastropods, ostracods and microconchids (Yang et al 2011(Yang et al , 2015a(Yang et al , 2015bWu et al 2016) that point to the development of a relatively simple marine ecosystem of low diversity and tiering in the aftermath of the end-Permian extinction. South China is a key region for the study of PTB microbialites due to their abundance and vast distribution in the area.…”

Section: Introductionmentioning

confidence: 99%

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Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China

et al. 2019

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Microbialites, often considered as a signal of extreme marine environment, are common in the Lower Triassic strata of South China where they flourished in the aftermath of the end-Permian mass extinction. Early Triassic microbialite facies are known to vary palaeogeographically, perhaps due to differing climates, ocean chemistry, and water depths. This paper provides the first record of a brief, but spectacular development of microbialites in the aftermath of the end-Permian mass extinction at Panjiazhuang section, Changxing Region of Zhejiang Province (eastern South China). Here, the Upper Permian Changxing Formation comprises typical shallow platform facies rich in calcareous algae and foraminifera, the development of which was terminated by the major end-Permian regression. A 3.4-m-thick microbialite began to form at the onset of the transgression in the earliest Triassic. The microbialite at Panjiazhuang section is composed of thrombolite that contains abundant calcified cyanobacteria, small gastropods, microconchid tubes and ostracods, representing a low-diversity shallow marine community in the aftermath of the end-Permian crisis. The microbialites are succeeded by thin-bedded micrites bearing thin-shelled bivalves, which record a rapid sea-level rise in the Early Triassic. Abundant populations of small pyrite framboids are observed in the upper part of the microbialites and the overlying thin-bedded micrites, suggesting that dysoxic water conditions developed at that time. The appearance of microbialites near the Permian-Triassic boundary (PTB) at Panjiazhuang section was the result of peculiar marine conditions following the end-Permian regression, whilst their disappearance was due to the increasing water depth and the development of dysoxia.

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Section: Early Triassic Microbialitessupporting

confidence: 75%

Section: Early Triassic Microbialitessupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China

et al. 2019

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“…In South China, these platforms were re-submerged at the start of Early Triassic that is marked by the first occurrence of conodont fossil of Hindeodus parvus (Yin et al 2001;Jiang et al, 2014;Wang et al, 2016). During this Early Triassic transgression microbialites developed over large areas of the Yangtze Platform as well as elsewhere around the world (Kershaw et al, 1999;Lehrmann, 1999;Lehrmann et al, 2003;Ezaki et al, 2003;Wang et al, 2005;Baud et al, 2007;Liu et al, 2007;Kershaw et al, 2012;Wu et al, 2014;Wu et al 2016;Fang et al, 2017;Wu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The evolution of microbialite forms during the Early Triassic transgression: A case study in Chongyang of Hubei Province, South China

Wang

Burne

Yuan

et al. 2019

Palaeogeography, Palaeoclimatology, Palaeoecology

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The widespread development of microbialites in shallow areas of the Tethys Ocean at the start of the Early Triassic reflects the deterioration of marine ecosystems in the aftermath of the extinction that marked the demise of the majority of Palaeozoic marine faunas. Here we present a study of the evolving microbialite forms and associated biotic assemblages of this pioneering microbialite interval from exposures at Chongyang, Hubei Province, China. This research provides a perspective on the effects of eustatic transgression on marine ecosystems as water depths increased at the beginning of Mesozoic, through the study of the changing forms, microfacies and distribution of microbialites. Microbialite forms evolved from stratiform stromatolites to a sequence of tabular thrombolites (with an intercalated layer of columnar stromatolites), followed by domical thrombolites that were overlain, in turn, by oolites. The stratiform stromatolites contain poorly preserved remains of calcified cyanobacteria, but microfossils with chambered structure can also be seen. Metazoan fossils increased from the base of the overlying tabular thrombolite, reflecting increasing biodiversity with deepening of seawater. The occurrence of columnar stromatolites within the tabular thrombolite may indicate a temporary sea-level shallowing. Foraminiferans and other metazoans are absent within the columnar stromatolites, but spherical cyanobacterial remains are extremely abundant. Well-preserved calcified cyanobacteria may reflect an absence of metazoan predation and/or carbonate supersaturation of seawater. As water deepened, domical thrombolites developed and the more complex seafloor relief created varied niches between and within the domes that harboured more ecologically diverse

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“…Analysis of conodont biostratigraphy, mega-to microscopic microbialite structures, stratigraphic variations in abundance and size of metazoan fossils, and total organic carbon (TOC) and total sulfur (TS) contents within the PTBM reveals the following results: (1) the microbialites occur mainly in the Hindeodus parvus Zone but may cross the Permian-Triassic boundary, and are comprised of, from bottom to top: lamellar thrombolites, dendritic thrombolites and lamellarreticular thrombolites; (2) most metazoan fossils of the microbialite succession increase in abundance upsection, so does the sizes of bivalve and brachiopod fossils; (3) TOC and TS values of microbialites account respectively for 0.07 and 0.31 wt% on average, both of which are very low. The Kershaw et al 2007Kershaw et al , 2009Kershaw et al , 2011Yang et al 2011;Forel et al 2013;Kershaw et al 2012;Loope et al 2013;Jiang et al 2014;Wu et al 2014;Lehrmann et al 2015;Wu et al 2016). Microbialites also occur later in the Early Triassic (Schubert and Bottjer 1992;Lehrmann 1999;Pruss and Bottjer 2004;Pruss et al 2006;Mary and Woods 2008;Mata and Bottjer 2011;Marenco et al 2012;Chen et al 2014;Vennin et al 2015), where they are commonly described as having formed in anoxic, harsh environments (e.g., Pruss and Bottjer 2004;Pruss et al 2006;Mary and Woods 2008;Mata and Bottjer 2011).…”

Section: Introductionmentioning

confidence: 99%

Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

Tang

Kershaw

Liu

et al. 2016

Facies

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combination of increase in abundance and size of metazoan fossils upsection, together with the low TOC and TS contents, is evidence that the Yudongzi PTBMs developed in oxic seawater. We thus dispute the previous view, at least for the Chinese sequences, of low-oxygen seawater for microbialite growth, and question whether it is now appropriate to associate PTBMs with anoxic, harsh environments associated with the end-Permian extinction. Instead, we interpret those conditions as fully oxygenated.

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Role and lifestyle of calcified cyanobacteria (Stanieria) in Permian–Triassic boundary microbialites

Cited by 21 publications

References 35 publications

Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China

Early Triassic microbialites from the Changxing Region of Zhejiang Province, South China

The evolution of microbialite forms during the Early Triassic transgression: A case study in Chongyang of Hubei Province, South China

Permian–Triassic boundary microbialites (PTBMs) in southwest China: implications for paleoenvironment reconstruction

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