Triassic Evolution of the Yangtze Platform in Guizhou Province, People's Republic of China

Enos, Paul; Lehrmann, Daniel J.; Wei, Jiayong; Yu, Yingxin; Xiao, Jianru; Chaikin, Daniel H.; Minzoni, Marcello; Berry, Adrian K.; Montgomery, Paul

doi:10.1130/2006.2417

Cited by 34 publications

(82 citation statements)

References 34 publications

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“…From this point of view, the lower Middle Anisian section in the Mahmudia Quarry resembles the shelf-edge framestones of the Anisian Chinese reefs (Enos et al 1997(Enos et al , 2006Payne et al 2006) and the Middle Anisian to Lower Ladinian boundstone facies of Latemar (Harris 1993;Emmerich et al 2005;Marangon et al 2011) and Marmolada (Russo et al 2000), both in the Italian Dolomites, and the Middle Anisian carbonate mounds in central Iran (Berra et al 2012).…”

Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

“…Emmerich et al 2005), the prominent Tubiphytes occurrence is the most important feature in the lower Middle Anisian buildup in the Mahmudia Quarry. It is stated that the Tubiphytes micro-encruster enabled the stabilisation of carbonate sediments in the upper slope and allowed cement-rich reefs to flourish in the early Middle Anisian (Senowbary-Daryan et al 1993;Enos et al 2006). Tubiphytes-microbial buildups characterized mostly high relief depositional systems during the crisis periods of large skeletal-metazoans buildups.…”

Section: Depositional Environmentmentioning

confidence: 99%

“…The North Dobrogean Tubiphytes-dominated framework, with a high volume (30-50%) of penecontemporaneous and early-diagenetic cements and a considerable amount of automicrite, corresponds well to other Tubiphytes-dominated reefs, known from the Late Palaeozoic to Mesozoic: the Permian reefs of the Urals in Russia (Chuvashov 1983;Antoshkina 1998), the Permian Capitan Reef in the United States (Tinker 1998;Saller et al 1999;Weidlich 2002), and the Middle Triassic (Anisian-Ladinian) reefs, such as the Great Bank of Guizhou, in south China (Enos et al 1997(Enos et al , 2006Lehrmann 1999;Payne et al 2006Payne et al , 2011Lehrmann et al 2007), the Camorelli Bank and Concarena platform in the Italian Lombardic Alps (Gaetani and Gorza 1989;Berra et al 2005;Seeling et al 2005), the Latemar platform in the Italian Dolomites (Harris 1993(Harris , 1994Emmerich et al 2005;Marangon et al 2011;Preto et al 2011), and the Aggtelek reef in Hungary (Velledits et al 2011(Velledits et al , 2012. Microbial boundstones, as Tubiphytes-dominated facies, are also the main constituents of the Carboniferous upper slopes in the Cantabrian Mountains in northern Spain (Della Porta et al 2003;2004;Kenter et al 2005;Bahamonde et al 2007).…”

Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

“…2) and crinoids, all embedded in large amounts of isopachous fibrous cmthick cements (Pl. 1, Fig The framestone is characterised by the abundance of Tubiphytes in growth position (see Enos et al 2006), the prominence of encrusting organisms (Tubiphytes and foraminifera, Pl. 1, Fig.…”

Section: Facies Typesmentioning

confidence: 99%

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An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Popa¹,

Panaiotu²,

Grădinaru³

2014

Acta Geologica Polonica

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ABSTRACT:Popa, L., Panaiotu, C.E. and Grădinaru, E. 2014. An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis. Acta Geologica Polonica, 64 (2), 189-206. Warszawa.A well-developed Triassic carbonate platform is exposed in the eastern part of the Tulcea Unit, in the Cimmerian North Dobrogean Orogen, southeastern Romania. Facies analysis of the 200 m thick succession of lower Middle Anisian limestones exposed in a large limestone quarry south of the village of Mahmudia suggests a transition from upper slope towards toe-of-slope carbonate facies, reflecting sea-level fluctuations and tectonic tilting. The slope is dominated by in situ microbialites in the upper portion, consisting of reefal boundstone facies, and by molluscan coquina and cement boundstones. A key role is played by the cosmopolitan micro-encruster Tubiphytes, which became common in the aftermath of the mass extinction at the Permian/Triassic boundary, and by autochthonous micrite and synsedimentary marine cement. The absence of metazoan reef builders, such as sponges and corals, reflects the fact that microbes were the first organisms to recover after the Permian/Triassic crisis under unusual marine conditions and that their main role in reef formation was sediment stabilization along the upper slopes. The lower slope is mostly detrital, being dominated by platform-derived bioclastic rudstones and crinoidal floatstones, which are interbedded with basinal carbonate hemipelagics. The toe-of-slope is composed of pelagic wackestones framed by thin tongues of intraclast breccia. All these observations are in agreement with the slopeshedding model described for the Pennsylvanian microbial margin in Asturias (northern Spain) and the AnisianLadinian flat-topped, steep-rimmed Latemar platform (Dolomites, Italy).As most of the Anisian reefs were described from western and eastern Tethys (Southern Alps, Hungary, China), the occurrence of the early Middle Anisian Tubiphytes-reef from North Dobrogea (Romania) contributes to resolving the puzzle of the geographic distribution of reef recovery in the Middle Triassic.

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Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

Section: Depositional Environmentmentioning

confidence: 99%

Section: Comparison With Other Tubiphytes-buildups Known In the Geolomentioning

confidence: 99%

Section: Facies Typesmentioning

confidence: 99%

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An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Popa¹,

Panaiotu²,

Grădinaru³

2014

Acta Geologica Polonica

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“…P/T boundary strata at Dajiang were deposited above the storm wave base on the Great Bank of Guizhou (GBG), an isolated carbonate platform within the Nanpanjiang Basin (32). The Nanpanjiang Basin is a deep-marine embayment in the Yangtze Block, which was located at approximately 12°N in the eastern Tethys during Early Triassic time (33). The section contains more than 50 m of diverse, fossiliferous packstone and grainstone of the Upper Permian Wujiaping Formation, which contains fusulinid and nonfusulinid foraminifers, calcareous green and red algae, rugose corals, crinoids, brachiopods, calcareous sponges, and gastropods (5,34).…”

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confidence: 99%

Calcium isotope constraints on the end-Permian mass extinction

Payne

Turchyn

Paytan

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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217

164

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The end-Permian mass extinction horizon is marked by an abrupt shift in style of carbonate sedimentation and a negative excursion in the carbon isotope (δ 13 C) composition of carbonate minerals. Several extinction scenarios consistent with these observations have been put forward. Secular variation in the calcium isotope (δ 44∕40 Ca) composition of marine sediments provides a tool for distinguishing among these possibilities and thereby constraining the causes of mass extinction. Here we report δ 44∕40 Ca across the Permian-Triassic boundary from marine limestone in south China. The δ 44∕40 Ca exhibits a transient negative excursion of ∼0.3‰ over a few hundred thousand years or less, which we interpret to reflect a change in the global δ 44∕40 Ca composition of seawater. CO 2 -driven ocean acidification best explains the coincidence of the δ 44∕40 Ca excursion with negative excursions in the δ 13 C of carbonates and organic matter and the preferential extinction of heavily calcified marine animals. Calcium isotope constraints on carbon cycle calculations suggest that the average δ 13 C of CO 2 released was heavier than −28‰ and more likely near −15‰; these values indicate a source containing substantial amounts of mantle-or carbonatederived carbon. Collectively, the results point toward Siberian Trap volcanism as the trigger of mass extinction.

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The role of carbonate factories and sea water chemistry on basin‐wide ramp to high‐relief carbonate platform evolution: Triassic, Nanpanjiang Basin, South China

Lehrmann

Stepchinski

Wolf

et al. 2021

The Depositional Record

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The end-Permian extinction and its aftermath altered carbonate factories globally for millions of years, but its impact on platform geometries remains poorly understood. Here, the evolution in architecture and composition of two exceptionally exposed platforms in the Nanpanjiang Basin are constrained and compared with geochemical proxies to evaluate controls on platform geometries. Geochemical proxies indicate elevated siliciclastic and nutrient fluxes in the basal Triassic, at the Induan-Olenekian boundary and in the uppermost Olenekian. Cerium/Ce* shifts from high Ce/Ce* values and a lack of Ce anomaly indicating anoxia during the Lower Triassic to a negative Ce anomaly indicating oxygenation in the latest Olenekian and Anisian. Uranium and Mo depletion represents widespread anoxia in the world's oceans in the Early Triassic with progressive oxygenation in the Anisian. Carbonate factories shifted from skeletal in the Late Permian to abiotic and microbial in the Early Triassic before returning to skeletal systems in the Middle Triassic, Anisian coincident with declining anoxia. Margin facies shifted to oolitic grainstone in the Early Triassic with development of giant ooids and extensive marine cements. Anisian margins, in contrast, are boundstone with a diverse skeletal component. The shift in platform architecture from ramp to steep, high-relief, flat-topped profiles is decoupled from carbonate compositions having occurred in the Olenekian prior to the onset of basin oxygenation and biotic stabilisation of the margins. A basin-wide synchronous shift from ramp to high-relief platforms points to a combination of high subsidence rate and basin starvation coupled with high rates of abiotic and microbial carbonate accumulation and marine cement stabilisation of oolitic margins as the primary causes for margin up-building. High sea water carbonate saturation resulting from a lack of skeletal sinks for precipitation, and basin anoxia promoting an expanded depth of carbonate supersaturation, probably contributed to marine

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Triassic Evolution of the Yangtze Platform in Guizhou Province, People's Republic of China

Cited by 34 publications

References 34 publications

An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

An early Middle Anisian (Middle Triassic) Tubiphytes and cement crusts-dominated reef from North Dobrogea (Romania): facies, depositional environment and diagenesis

Calcium isotope constraints on the end-Permian mass extinction

The role of carbonate factories and sea water chemistry on basin‐wide ramp to high‐relief carbonate platform evolution: Triassic, Nanpanjiang Basin, South China

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