Evidence for rapid precipitation of calcium carbonate in South China at the beginning of Early Triassic

Deng, Baozhu; Wang, Yongbiao; Woods, Adam D.; Sheng, Li; Li, Guoshan; Chen, Weihan

doi:10.1016/j.palaeo.2016.06.007

Cited by 19 publications

(15 citation statements)

References 61 publications

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“…Alternative explanations include ocean carbonate supersaturation, as well as upwelling of alkaline waters from deeper oxygen-depleted water masses within the intertropical convergence zone (Kershaw et al, 1999(Kershaw et al, , 2007. Subsequently, Kershaw et al (2012a) presented in this paper add to the results from previous studies of the BETM (Lehrmann et al, 2003;Ezaki et al, 2008;Kershaw et al, 2011;Yang et al, 2011;Deng et al, 2016) and newly integrate observations from a broad range of scales, from micro-textures to basin geodynamic regime. Special emphasis is also placed on the cessation of microbialites deposition.…”

Section: Introductionmentioning

confidence: 74%

“…2, 3), the subtidal Heshan Fm. ends with an ash layer (Unit 2, Fig, 18), whose apatite chemical composition and U-Pb age demonstrate that it originated from the same eruption (Baresel et al, 2015;in press). This ash layer can thus be used as reliable synchronous time line (Fig, 18).…”

Section: Accepted Manuscriptmentioning

confidence: 98%

“…Both shallowing and deepening trends have been inferred from facies analysis of various BETM sections (e.g. Ezaki et al, 2003;Kershaw et al, 2011;Deng et al, 2016). Comparisons within and across different Tethyan equatorial transit blocks (Ricou, 1994), such as South China and Turkey, may also help extracting the commonalities and differences of BETM sections, provided that enough information is available for reconstructing the paleogeographic and geodynamic context in which they were deposited.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Similarly, patterns of cessation of the BETM may shed light on the relative roles of global versus local controls. Two diverging interpretations have been proposed, with either an abrupt (Kershaw et al, 2002;Ezaki et al, 2003;Deng et al, 2016) or a step-wise cessation (Ezaki et al, 2008).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Triassic. In conjunction with reduced bathymetry and higher energy, carbonate supersaturation (Groves and Calner, 2004;Calner, 2005;Li et al, 2015aLi et al, , 2015b A C C E P T E D M A N U S C R I P T Deng et al, 2016) also contributed to the local production of oolites overlying the BETM.…”

Section: Water Chemical Compositionmentioning

confidence: 99%

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Onset, development, and cessation of basal Early Triassic microbialites (BETM) in the Nanpanjiang pull-apart Basin, South China Block

et al. 2017

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New investigations in the Nanpanjiang Basin indicate that the onset of the iconic microbialites associated with the Paleozoic-Mesozoic boundary was Early Triassic in age. Bathymetry (water agitation, oxygenation, light penetration) and clastic load are shown to have exerted a direct control on the growth of microbialites. Carbonate supersaturation is also required for the deposition of the microbialites. Bathymetric control is further corroborated by the topographic inheritance of a latest Permian pull-apart basin into Early Triassic times, with a distribution of basal Early Triassic microbialites (BETM) restricted to uplifted blocks. This control is also reflected by the accumulation of carbonaceous black shales in adjacent troughs. The geographically most extensive Nanpanjiang BETM bloomed on a large NW-SE trending uplifted block exceeding 12,000 km2 (Luolou Platform) centered on northwestern Guangxi. Post-Triassic displacements along the Youjiang Fault obscure the paleogeographic relation of BETM exposed west of this fault. Triassic foraminifers occur in the basal most BETM episode, which is locally bracketed by high-energy grainstones made of reworked Permian foraminifers. Therefore, the Permian-Triassic boundary (PTB) is within the unconformity that separates the Late Permian Heshan Fm. from the basal most BETM. Where accommodation space was sufficient, up to five event surfaces are associated with the unconformity. Microfacies analysis supports chemical dissolution but did not reveal evidence for subaerial erosion, although intercalated grainstone made of Permian foraminifers indicate reworking. Chemical dissolution and mechanical erosion both conceivably contributed to the genesis of the unconformity. The upward shift from tabulated to domical microbial build-ups is accompanied by accumulation of coquinoid lenses between domes, which indicates deepening of the Luolou Platform BETM. The main drowning resulting from both regional tectonic subsidence and a global sea-level rise led to the cessation of the BETM that were buried under predominant fine siliciclastics. Any concomitant change in sea water chemistry appears unlikely.

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Section: Introductionmentioning

confidence: 74%

Section: Accepted Manuscriptmentioning

confidence: 98%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Water Chemical Compositionmentioning

confidence: 99%

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Onset, development, and cessation of basal Early Triassic microbialites (BETM) in the Nanpanjiang pull-apart Basin, South China Block

et al. 2017

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Early Triassic (Griesbachian) spheroids in Beibei, Chongqing, Southwestern China: Characteristics, cause and implications for palaeo‐oceanic conditions

Duan,

Yuan,

Qiao

et al. 2024

Geological Journal

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Following the latest Permian mass extinction (LPME), abundant unusual sedimentary features and fabrics were widely distributed in Early Triassic carbonate platforms. As a unique type of carbonate grain, spheroids from the Lower Triassic are infrequently reported, yet differ significantly from giant ooids and oncoids. Griesbachian micritic spheroids are well preserved in the Lower Triassic Feixianguan Formation at the Baimiaozi (BMZ) outcrop in Beibei, Chongqing, southwestern China. These spheroids (diameter: 3.9–10.8 mm) were in a marl layer interbedded with massive oolites. They were deposited in the wave troughs of ripple marks comprising micritic clots, sparry calcite, clay minerals, organic matter and pyrite. A microbial spheroid origin is implied based on the coccoidal microbes (coccoid‐like microspherules and bacterial clump‐like microspherules), numerous pyrite framboids (indications suggest the presence of many sulphate‐reducing bacteria and the high iron content in seawater can promote nitrogen‐fixing cyanobacteria proliferation) and microbial‐derived microspherules. The dark‐coloured matrix between the spheroids primarily included microcrystalline calcite, clay minerals, organic matter and metazoan fossils. The spherical and ellipsoidal shapes of the spheroids suggested rapid accretion and lithification. As a unique carbonate depositional mode, Greisbachian spheroids may have been recorded for a palaeo‐ocean with dysoxic and calcium carbonate supersaturation shortly after the LPME.

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Anachronistic and unusual carbonate facies in uppermost Lower Triassic rocks of the western Balkanides, Bulgaria

Chatalov

2017

Facies

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Evidence for rapid precipitation of calcium carbonate in South China at the beginning of Early Triassic

Cited by 19 publications

References 61 publications

Onset, development, and cessation of basal Early Triassic microbialites (BETM) in the Nanpanjiang pull-apart Basin, South China Block

Onset, development, and cessation of basal Early Triassic microbialites (BETM) in the Nanpanjiang pull-apart Basin, South China Block

Early Triassic (Griesbachian) spheroids in Beibei, Chongqing, Southwestern China: Characteristics, cause and implications for palaeo‐oceanic conditions

Anachronistic and unusual carbonate facies in uppermost Lower Triassic rocks of the western Balkanides, Bulgaria

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