Sedimentary evolution of the Ediacaran Yangtze platform shelf (Hubei and Hunan provinces, Central China)

Vernhet, E.; Reijmer, John J.G.

doi:10.1016/j.sedgeo.2010.01.005

Cited by 56 publications

(21 citation statements)

References 43 publications

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“…The variable Os i shown here are not surprising because recent studies suggest basin restriction for the lower Doushantuo Formation, although the details are debated (e.g. Bristow et al, 2009;Vernhet and Reijmer, 2010;Jiang et al, 2011;Shen et al, 2011). In restricted basins, 187 Os/ 188 Os value of the water column is sensitive to variations in freshwater input, which drives 187 Os/ 188 Os variations in sediments (McArthur et al, 2008).…”

Section: Significance Of the Age Of Deposition Of The Doushantuo Blacmentioning

confidence: 60%

Re–Os geochronology of black shales from the Neoproterozoic Doushantuo Formation, Yangtze platform, South China

Zhu

Becker

Jiang

et al. 2013

Precambrian Research

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Section: Significance Of the Age Of Deposition Of The Doushantuo Blacmentioning

confidence: 60%

Re–Os geochronology of black shales from the Neoproterozoic Doushantuo Formation, Yangtze platform, South China

Zhu

Becker

Jiang

et al. 2013

Precambrian Research

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“…Furthermore, thick dolomites with anhydrite and up to 200-m halite were deposited in the Changnin Basin in south Sichuan (Xi 1987). The restricted conditions required to form evaporites were possibly caused by a temporarily rimmed morphology of the Ediacaran Yangtze platform (Zhu et al 2003Vernhet and Reijmer 2010;Jiang et al 2011) or the Jiangnan Uplift, which was situated between the platform in the east and the basin in the west (Xi 1987;Siegmund and Erdtmann 1994). However, the regional formation of evaporitic basins was possibly also controlled by fault-related subsidence (Xi 1987;Vernhet 2007;Vernhet et al 2007; see ''Development of the Shibantan basin'').…”

Section: Resultsmentioning

confidence: 99%

Depositional dynamics of a bituminous carbonate facies in a tectonically induced intra-platform basin: the Shibantan Member (Dengying Formation, Ediacaran Period)

Duda

Zhu

Reitner

2015

Carbonates Evaporites

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The Ediacaran Shibantan Member (Dengying Formation, South China) is characterised by a black, laminated bituminous limestone facies with diverse Ediacara-type organisms and trace fossils. However, still little is known about the evolution of the Shibantan basin and its sedimentary dynamics. A detailed sedimentological characterisation revealed that the Shibantan Member was deposited on a carbonate ramp system linked to an intraplatform basin. Evaporitic dolomites of the Hamajing Member (representing sub-to supratidal inner ramp environments above fair weather wave base) are sharply overlain by black, laminated limestones of the lower Shibantan Member, representing a subtidal lower-to middle ramp environment close to the storm wave base. This facies-shift implies a sudden local deepening event, probably due to a tectonically induced increase in subsidence. The Shibantan basin was subsequently filled as evidenced by the gradual transition into dark wavy dolomites deposited in a subtidal middle-ramp environment (i.e. between storm-and fair weather wave bases) and, eventually, the upper Dengying Formation (i.e. the Baimatuo Member), which represents the same depositional environments as the Hamajing Member. Sedimentation in the Shibantan basin was highly dynamic as evidenced by a distinct slumping horizon and mass-flow deposits, partly possibly due to synsedimentary tectonic processes. A microbial mat associated biota which includes Ediacara-type fossils is restricted to the lower Shibantan Member. The close spatial relationship between allochthonous event deposits and autochthonous fossil associations in this setting implies that the event deposits were not only important for the preservation of fossils, but probably also for the supply of nutrients.

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“…The Doushantuo Formation (635-551 Ma in age, including four lithostratigraphic members I-IV in ascending order; Figure 1) in the Yangtze Gorges area was considered to have been deposited mostly in a shelf lagoon separated from the open ocean by a shelf margin barrier [8], but others [9,10] suggested that the middle and upper Doushantuo Formation in the Yangtze Gorges area, including Member III-the focus of this paper, might have been deposited in an open shelf. Previous studies indicate that in the Yangtze Gorges area Ediacaran acanthomorphs appear shortly after the termination of the Nantuo glaciation and disappear in Member III of the Doushantuo Formation, just below the pronounced negative δ 13 C carb excursion EN3 (Figure 1) that is correlated with the Shuram excursion and represents the largest negative δ 13 C carb excursion in Earth history [2,3,7,11].…”

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confidence: 99%

Rare earth elements and carbon isotope geochemistry of the Doushantuo Formation in South China: Implication for middle Ediacaran shallow marine redox conditions

et al. 2012

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The middle Ediacaran Shuram excursion, the largest negative δ 13 C carb excursion in Earth history, has been interpreted as indirect evidence for episodic oxidation and remineralization of deep ocean DOC (dissolved organic carbon). It has been hypothesized that such oxidation event may have occurred when anoxic DOC-laden deep water was brought to shallow shelves during oceanic upwelling, which is expected to cause localized anoxia in shallow environments. To test this prediction, we systematically analyzed rare earth elements (REE) and δ 13 C carb of the upper Doushantuo Formation carbonates in the Yangtze Gorges area of South China, which were deposited in an inner shelf environment and record a large negative δ 13 C carb excursion correlated to the Shuram event. The REE data show a significant positive shift in Ce/Ce* values, synchronous with a pronounced negative δ 13 C carb shift. This positive Ce/Ce* shift is interpreted to represent an oceanic anoxia event in shallow shelf environments, which may have been caused by the upwelling or impingement of oxygen-depleted and 12 C-enriched deep water onto shelves. This anoxia event coincides with a sharp decline in the abundance and diversity of Ediacaran acanthomorphic acritarchs, raising the possibility that these two geobiological events may be causally related. Carbon and sulfur isotope data indicate that deep oceans were episodically oxygenated and deep ocean DOC progressively remineralized during the Ediacaran Period [1,2]. These remineralization events likely involved upwelling of anoxic DOC-laden water to shallow shelves, impacting on the shallow-water redox conditions and biological evolution. Indeed, the Ediacaran fossil record shows a significant biotic turnover in shallow shelf environments during the middle Ediacaran Period, with the early Ediacaran biota characterized by globally distributed acanthomorphic acritarchs [3], and the late Ediacaran ones by classical Ediacara megafossils [4]. Previous researchers have argued that this turnover may have been driven by a middle Ediacaran glaciation event [5], predation pressure from macrophagous metazoans [3], or the oxygenation of continental shelves that released the ecological impetus for the development of acanthomorphic resting stages [6]. Integrated paleobiological and geochemical data from the Doushantuo Formation in the Yangtze Gorges area suggest that this turnover is coincident with a pronounced negative δ 13 C carb excursion that is correlated with the Shuram excursion [7], and thus may be related to shallow water anoxia resulting from upwelling of deep marine waters. The Doushantuo Formation (635-551 Ma in age, including four lithostratigraphic members I-IV in ascending order; Figure 1) in the Yangtze Gorges area was considered to

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Sedimentary evolution of the Ediacaran Yangtze platform shelf (Hubei and Hunan provinces, Central China)

Cited by 56 publications

References 43 publications

Re–Os geochronology of black shales from the Neoproterozoic Doushantuo Formation, Yangtze platform, South China

Re–Os geochronology of black shales from the Neoproterozoic Doushantuo Formation, Yangtze platform, South China

Depositional dynamics of a bituminous carbonate facies in a tectonically induced intra-platform basin: the Shibantan Member (Dengying Formation, Ediacaran Period)

Rare earth elements and carbon isotope geochemistry of the Doushantuo Formation in South China: Implication for middle Ediacaran shallow marine redox conditions

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