A ?microbialite carbonate crust at the Permian–Triassic boundary in South China, and its palaeoenvironmental significance

Kershaw, Stephen; Zhang, Tingshan; Guang-zhi, Lan

doi:10.1016/s0031-0182(98)00139-4

Cited by 185 publications

(135 citation statements)

References 51 publications

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“…3C are evidence that sediment enclosing the microbialite structure was contemporaneous with the growth of the microbialite branches. These results support the suggestion by Kershaw et al (1999Kershaw et al ( , 2002 that microbialite branches protruded a short distance above the enclosing sediment, keeping pace with sedimentation as the microbialite branches grew. …”

Section: B Carbon Isotopes Marine Oxygenation and Earliest Triassisupporting

confidence: 90%

“…The microbialite is recrystallised to varying degrees, from partial to complete (Kershaw et al, 1999); no samples have been found with unaltered structure. Isotopes were measured primarily from micritic sediment between branches of microbialite; however, isotope data were also obtained from samples collected from the microbial fabric itself, in order to examine the relationship between the isotopes of the microbial structure and the directly adjacent sediment.…”

Section: Locality Geological Setting and Methodsmentioning

confidence: 99%

“…Microbialites are widespread either on, or a short distance above, the event horizon, including prominent examples in the South China Block (SCB). This paper describes and interprets detailed changes in δ 13 C CARB throughout a microbialite unit in the Laolongdong locality in the SCB, where PTB facies have been documented (Kershaw et al, 1999), and is the first account of carbon isotopes from these deposits. This paper is the full documentation of results presented by Mu et al (2001).…”

Section: Introductionmentioning

confidence: 99%

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High-resolution carbon isotope changes in the Permian–Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites

Kershaw

et al. 2009

Journal of Asian Earth Sciences

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High-resolution δ 13 C CARB analysis of the Permian-Triassic boundary (PTB) interval at the Laolongdong section, Beibei, near the city of Chongqing, south China, encompasses the latest Permian and earliest Triassic major facies changes in the South China Block (SCB). Microbialites form a distinctive unit in the lowermost 190 cm above the top of the Changhsing Formation (latest Permian) at Laolongdong, comparable to a range of earliest Triassic sites in low latitudes in the Tethyan area. The data show that declining values of δ 13 C CARB , well-known globally, began at the base of the microbialite. High positive values (+3-4 ppt) of δ 13 C CARB in the Late Permian are interpreted to indicate storage of 12 C in the deep waters of a stratified ocean, that was released during ocean overturn in the earliest Triassic, contributing to the distinctive fall in isotope values; this interpretation has been stated by other authors and is followed here. The δ 13 C CARB curve shows fluctuations within the microbialite unit, which are not reflected in the microbialite structure. Comparisons between microbialite branches and adjacent micritic sediment show little difference in δ 13 C CARB , demonstrating that the microbialite grew in equilibrium with surrounding seawater. The Early Triassic microbialites are interpreted to be a response to upwelling of bicarbonate-rich poorly-oxygenated water in low latitudes of Tethys ocean, consistent with current ocean models for the PTB interval. However, the decline of δ 13 C CARB may be due to a combination of processes, including productivity collapse resulting from mass extinction, return of deep water to ocean surface,

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Section: B Carbon Isotopes Marine Oxygenation and Earliest Triassisupporting

confidence: 90%

Section: Locality Geological Setting and Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-resolution carbon isotope changes in the Permian–Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites

Kershaw

et al. 2009

Journal of Asian Earth Sciences

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“…It is generally 2 to 10 m thick and consists of two parts (Kershaw et al, 1999(Kershaw et al, , 2007(Kershaw et al, , 2012Lehrmann, 1999;Ezaki et al, 2003Ezaki et al, , 2008Wang et al, 2005Wang et al, , 2012Jiang and Wu, 2007a,2007bYang et al, 2011). The lower part consists of gray limestone with scattered irregular brown spots 0.5 to 1.5 cm wide, and has been described as spotted rock.…”

Section: Resultsmentioning

confidence: 99%

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

Jiang

et al. 2016

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…그러나 데본기 후 기 대멸종 이전에도 상당수의 미생물초가 존재하였기 때문에, 이 시기에 미생물초가 번성했던 것에는 대멸 종 이외에도 다른 이유가 있을 수 있다 (Feng et al, 2010;Shen et al, 2010). 페름기 말 대멸종 직후 약 150만 년에서 500만 년에 걸쳐 주로 Renalcis 그룹 또는 Microcystis로 생각되는 미생물과 미크라이트로 구성된 미생물암이 전 세계적으로 널리 나타났다 (Kershaw et al, 1999(Kershaw et al, , 2012Ezaki et al, 2003;Wu et al, 2014). 이 시 기의 미생물암은 주로 저위도 지역의 다양한 퇴적 환 경에 분포하였으며 (Kershaw et al, 2012), 트라이아 스기 중기 이후 후생동물 생태계가 대멸종의 타격에 서 점차 회복되면서 크게 감소하였다 (Xie et al, 2010;Brayard et al, 2011).…”

Section: 지질시대에서 나타나는 미생물암unclassified

A Review on Microbialites: a Korean Perspective

Lee¹

2015

The Journal of the Petrological Society of Korea

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Microbialites are defined as rocks formed by microbial organisms. After their first appearance around 3.5 billion years ago, microbialites occur in various depositional environments throughout geological periods. Microbial organisms form microbialites by trapping and binding detrital sediments and/ or precipitating carbonate cements, resulting in formation of various microstructures and mesostructures. Four major types of microbialites are distinguished based on their mesostructures: stromatolite, thrombolite, dendrolite, and leiolite. In the geological records, occurrences of microbialites are influenced by calcium carbonate saturation of seawater and interaction of microbialites with metazoans. Stromatolites mainly flourished during the Precambrian, and diminished as level of atmospheric carbon dioxide declined. On the other hand, thrombolites, mainly formed by calcified microbes, began to flourish from the Neoproterozoic. As metazoans diversified in the Phanerozoic, proportion of the microbialites within sedimentary record declined. Since then, microbialites only occasionally flourished during the Phanerozoic, such as shortly after mass-extinction events. In the Korean Peninsula, microbialites occur in the Neoproterozoic Sangwon System, the Early Paleozoic Joseon Supergroup, and the Cretaceous Gyeongsang Supergroup, which form different shapes according to their age and depositional environments. By performing detailed studies on these Korean microbialites, it is possible to understand how microbes affected geological records and sedimentary environments, as well as their interaction with other organisms.

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A ?microbialite carbonate crust at the Permian–Triassic boundary in South China, and its palaeoenvironmental significance

Cited by 185 publications

References 51 publications

High-resolution carbon isotope changes in the Permian–Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites

High-resolution carbon isotope changes in the Permian–Triassic boundary interval, Chongqing, South China; implications for control and growth of earliest Triassic microbialites

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

A Review on Microbialites: a Korean Perspective

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