Lower Triassic peritidal cyclic limestone: an example of anachronistic carbonate facies from the Great Bank of Guizhou, Nanpanjiang Basin, Guizhou province, South China

Lehrmann, Daniel J.; Yang, Wan; Wei, Jiayong; Yu, Yingxin; Xiao, Jianru

doi:10.1016/s0031-0182(01)00302-9

Cited by 101 publications

(86 citation statements)

References 37 publications

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“…This sequence defines a shallowing-upward package, suggesting that the flaser-bedded packstone formed in an intertidal depositional environment. Similar flaser-bedded ribbon rocks were described from South China and interpreted as tidal-flat deposits (Lehrmann et al, 2001). However, the lack of desiccation features here suggests a deeper water setting with variable energy more similar to the ribbon rock carbonates described from the Middle Cambrian of Virginia (Koerschner and Read, 1989).…”

Section: Flaser-bedded Packstonesupporting

confidence: 65%

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Osburn¹,

Grotzinger²,

Bergmann³

2014

Bulletin

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The Khufai Formation is the oldest carbonate platform of the Cryogenian to lowermost Cambrian Huqf Supergroup. A stratigraphic characterization of this unit includes detailed facies descriptions, a sequence-stratigraphic interpretation, and evaluation of lateral heterogeneity and overall ramp evolution. The Khufai Formation comprises one and one-half depositional sequences with a maximum flooding interval near the base of the formation and a sequence boundary within the upper peritidal facies. Most of the deposition occurred during highstand progradation of a carbonate ramp. Facies tracts include outer-ramp and midramp mudstones and wackestones, ramp-crest grainstone shoal deposits, and extensive inner-ramp, microbially dominated peritidal deposits. Outcrops in the Oman Mountains are deepwater deposits, including turbiditic grainstone and wackestone interbedded with siliciclastic-rich siltstone and crinkly laminite. Facies patterns and parasequence composition are variable both laterally across the outcrop area and vertically through time because of a combination of ramp morphology, siliciclastic supply, and possible syndepositional faulting. The lithostratigraphic boundary between the Khufai Formation and the overlying Shuram Formation is gradational and represents significant flooding of the carbonate platform. The stratigraphic characterization presented here along with the identification of key facies and diagenetic features will help further future exploration and production of hydrocarbons from the Khufai Formation.

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Section: Flaser-bedded Packstonesupporting

confidence: 65%

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Osburn¹,

Grotzinger²,

Bergmann³

2014

Bulletin

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“…This is consistent with the absence of evidence for continental glaciation during the Early Triassic (Frakes et al 1992). Larger amplitude sea-level fluctuations have been inferred from other Lower Triassic sections (e.g., Lehrmann et al 2001). However, the Jesmond succession provides a probably better record of the contemporaneous eustatic fluctuation, for the Jesmond buildup rest on a tectonically stable and constantly, thermally subsiding midocean seamount.…”

Section: Sea-level Changesmentioning

confidence: 88%

“…The quiet conditions were, however, intermittently disturbed by storms, resulting in deposition of flat-pebble conglomerates at several levels of the middle and upper units, though a non-storm origin of this facies is also possible (Myrow et al 2004). Flat-pebble conglomerate is a common facies especially on CambroOrdovician carbonate platforms, but is much rarer in younger sediments (Sepkoski 1991;Kuznetzov and Suchy 1992;Friedman 1994;Wignall and Twitchett 1999) before exhibiting an ''anachronistic'' resurgence in Lower Triassic carbonate platform successions (Wignall and Twitchett 1999;Lehrmann et al 2001;Pruss et al 2005Pruss et al , 2006. The deposition of flat-pebble conglomerates on the Jesmond buildup is thought to be related to the limited infaunal bioturbation that reflects the Early Triassic stressed environmental conditions that followed the end-Permian crisis (Wignall and Twitchett 1999;Pruss et al 2005Pruss et al , 2006.…”

Section: Depositional Conditionsmentioning

confidence: 99%

Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada

Sano

Onoue

Orchard

et al. 2011

Facies

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The Jesmond succession of the Cache Creek Terrane in southern British Columbia records late Early Triassic peritidal carbonate sedimentation on a mudflat of a buildup resting upon a Panthalassan seamount. Conodont and foraminiferal biostratigraphy dates the succession as the uppermost Smithian to mid-Spathian. The study section (ca. 91 m thick) is dominated by fine-grained carbonates and organized into at least 12 shallowing-upwards cycles, each consisting of shallow subtidal facies and overlying intertidal facies. The former includes peloidal and skeletal limestones, flat-pebble conglomerates, stromatolitic bindstones, and oolitic grainstone, whereas the latter consists mainly of dolomicrite. The scarcity of skeletal debris, prevalence of microbialite, and intermittent intercalation of flat-pebble conglomerate facies imply environmentally harsh conditions in the mudflat. The study section also records a rapid sea-level fall near the Smithian-Spathian boundary followed by a gradual sea-level rise in the early to mid-Spathian.

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“…Above the thin packstone interval are 47 m of thinly bedded, poorly bioturbated micritic limestone. The Lower Triassic section continues with 95 m of dolomite and dolomitized ooid-bearing cryptalgal laminate overlain by 225 m of peritidal limestone cycles (5,36). Carbonate sediments continued to accumulate on the GBG through Middle Triassic time, reaching a total thickness of nearly 2 km before the platform drowned early in the Late Triassic (32).…”

mentioning

confidence: 99%

Calcium isotope constraints on the end-Permian mass extinction

Payne

Turchyn

Paytan

et al. 2010

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

Self Cite

216

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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Lower Triassic peritidal cyclic limestone: an example of anachronistic carbonate facies from the Great Bank of Guizhou, Nanpanjiang Basin, Guizhou province, South China

Cited by 101 publications

References 37 publications

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Facies, stratigraphy, and evolution of a middle Ediacaran carbonate ramp: Khufai Formation, Sultanate of Oman

Early Triassic peritidal carbonate sedimentation on a Panthalassan seamount: the Jesmond succession, Cache Creek Terrane, British Columbia, Canada

Calcium isotope constraints on the end-Permian mass extinction

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