Permian–Triassic boundary microbialites at Zuodeng Section, Guangxi Province, South China: Geobiology and palaeoceanographic implications

Fang, Yuheng; Chen, Zhong‐Qiang; Kershaw, Stephen; Yang, Hao; Luo, Mao

doi:10.1016/j.gloplacha.2017.02.011

Cited by 48 publications

(22 citation statements)

References 74 publications

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“…; Fang et al . ). Shelly layers, dominated by ostracods and gastropods, are very common in PTBMs (e.g.…”

Section: Resultsmentioning

confidence: 97%

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Diverse earliest Triassic ostracod fauna of the non-microbialite-bearing shallow marine carbonates of the Yangou section, South China

Qiu

Tian

et al. 2019

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Since diverse ostracod faunas in the immediate aftermath of the latest Permian mass extinction are mainly found within Permian–Triassic boundary microbialites (PTBMs), the idea of an ostracod ‘microbial‐related refuge’ has been proposed. Here, we report a diversified earliest Triassic ostracod fauna from the Yangou section in South China, where no PTBMs were deposited, providing evidence inconsistent with this ‘microbial‐related refuge’ hypothesis. In addition, a significant ostracod extinction is recorded, corresponding with the earliest Triassic mass extinction (ETME). This ETME of ostracods is associated with size increases and a length/height ratio (L/H) decrease, indicating varied evolutionary patterns of shape and size of ostracods through the Permian–Triassic (P‐Tr) extinction events. Although the nature of these biotic changes is somewhat unclear, the temporally varied ‘refuge zone’ scenario provides us with a window to reconstruct the environmental dynamics of ecosystem changes during the P‐Tr transition.

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“…; Fang et al . ). Shelly layers, dominated by ostracods and gastropods, are very common in PTBMs (e.g.…”

Section: Resultsmentioning

confidence: 97%

“…Yang et al 2011;Tang et al 2017;Tian et al 2019) than coeval stromatolitic mats, which tend to contain few marine invertebrates (e.g. Adachi et al 2017;Fang et al 2017). Shelly layers, dominated by ostracods and gastropods, are very common in PTBMs (e.g.…”

Section: Earliest Triassic Ostracod Extinction and Associated Size Vamentioning

confidence: 99%

Diverse earliest Triassic ostracod fauna of the non-microbialite-bearing shallow marine carbonates of the Yangou section, South China

Qiu

Tian

et al. 2019

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“…The titaniferous‐iron microspherules are consistently distributed alongside the siliceous microspherules within the strata, and their high contents of Si, Al, and Ti also suggest that they are of volcanic origin. Similar calcimicrospherules and organic spherules are often observed in some deep‐time microbialites or other sedimentary rocks, and they are usually interpreted as products of microbial precipitation (Z. Q. Chen et al, ; Fang, Chen, Kershaw, Yang, & Luo, ; C. Huang & Xu, ; Luo et al, ; H. Zhang, Liu, et al, ). These Dawangou calcimicrospherules and organic microspherules are of biological origin.…”

Section: Discussionmentioning

confidence: 85%

Abundant microspherules from the Upper Ordovician of northern Tarim Basin, Northwest China: Origin and palaeoenvironmental implications

et al. 2018

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A continuous record of abundant microspherules, pyrite framboids, and bacterial fossils is obtained from the Upper Ordovician in the Dawangou section of northern Tarim Basin, Northwest China. Chemical and physical characteristics of these microspherules were determined using a scanning electron microscope and an energy dispersive spectrometer. Microspherules were formed as a single spherule, spherule aggregates, and drop‐like particles. Physical morphology of the spherules has no relation to its formational process. Energy dispersive spectrometry results indicate that microspherules are mainly composed of Ca, C, O, Si, Al, S, Fe, and Ti. Thus, these microspherules are further categorized into 5 major types: iron, titaniferous‐iron, siliceous, calcareous, and organic microspherules. The first 3 types of microspherules are likely of volcanic origin rather than extraterrestrial origins (i.e., impact event or cosmic dusts) or modern industrial pollutions due to their morphologies and chemical compositions. Both calcimicrospherules and organic microspherules are biogenic, and they are distributed in the lower part of the studied section (Beds 4–6), in which cephalopods, brachiopods, and bacterial fossils are also commonly present and pyrite framboids are absent. These features generally point to an oxic condition. In contrast, other microspherules are abundant in the upper part of the section (Beds 9–13), in which tiny pyrite framboids (mean diameters 4.6–7.3 μm) are rather abundant and typical of euxinic to dysoxic conditions. Both microspherule and pyrite framboid evidences indicate that the northern Tarim region became oxygen‐poor conditions, which were coupled with intensive volcanic eruptions during the Late Ordovician.

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“…The associated changes in marine environments affected organisms and their host sedimentary facies. This is particularly clear in shallow carbonate platform settings of the Peri-Tethys Ocean where Late Permian bioclastic limestones enriched in benthic fossils were replaced by microbialites in the Early Triassic (Kershaw et al 1999(Kershaw et al , 2012Lehrmann 1999;Ezaki et al 2003;Lehrmann et al 2003;Wang et al 2005;Baud et al 2007;Liu et al 2007;Yang et al 2006Yang et al , 2011Adachi et al 2017;Deng et al 2017;Fang et al 2017;Tang et al 2017;Pei et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…South China is a key region for the study of PTB microbialites due to their abundance and vast distribution in the area. South China microbialites have mostly been described from the middle and upper Yangtze Platform (Zhu et al 1994;Kershaw et al 1999Kershaw et al , 2002Ezaki et al 2003;Wang et al 2005;Wu et al 2006Wu et al , 2007Yang et al 2006;Tang et al 2017) and isolated platforms from the Nanpanjiang Basin (Lehrmann 1999;Yang et al 1999;Lehrmann et al 2003;Krull et al 2004;Liu et al 2007;Ezaki et al 2008;Luo et al 2011;Fang et al 2017). In contrast, published occurrences of PTB microbialites from the lower Yangtze Platform are restricted to one example reported from Xishan of Jiangsu Province (Zheng et al 2016).…”

Section: Introductionmentioning

confidence: 99%

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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Permian–Triassic boundary microbialites at Zuodeng Section, Guangxi Province, South China: Geobiology and palaeoceanographic implications

Cited by 48 publications

References 74 publications

Diverse earliest Triassic ostracod fauna of the non-microbialite-bearing shallow marine carbonates of the Yangou section, South China

Diverse earliest Triassic ostracod fauna of the non-microbialite-bearing shallow marine carbonates of the Yangou section, South China

Abundant microspherules from the Upper Ordovician of northern Tarim Basin, Northwest China: Origin and palaeoenvironmental implications

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

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