Assessing Early Triassic paleoceanographic conditions via unusual sedimentary fabrics and features

Woods, Adam D.

doi:10.1016/j.earscirev.2013.08.015

Cited by 73 publications

(46 citation statements)

References 141 publications

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“…1B). It is probably unrealistic to believe that hydrothermal vents were so widespread and thus , 2014;Kershaw, 2015). This is also consistent with the occurrence of authigenic quartz, which can also be ascribed to microbial sulfate reduction by SRB (Luo et al, 2014).…”

Section: Accepted Manuscriptsupporting

confidence: 55%

Microbial proliferation coinciding with volcanism during the Permian–Triassic transition: New, direct evidence from volcanic ashes, South China

Fang

Hong

Chen

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Accepted Manuscriptsupporting

confidence: 55%

Microbial proliferation coinciding with volcanism during the Permian–Triassic transition: New, direct evidence from volcanic ashes, South China

Fang

Hong

Chen

et al. 2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Associated with the mass extinction, oceanic depositional systems returned to conditions similar to Precambrian-Cambrian oceans, indicated by the global occurrence of unusual sediments, such as microbialites, stromatolites, giant ooids, sea floor fan precipitates and wrinkle structures (Li et al, 2013;Baud et al, 2007;Knoll et al, 2007;Pruss et al, 2006). This turnover has been interpreted as the sedimentary response to ecosystem changes, attributed to unusual seawater chemistry, perturbation of bioturbation and grazing pressures, and other changes in actualistic sedimentologic processes (Woods, 2014;Pruss et al, 2006).…”

Section: Introductionmentioning

confidence: 97%

Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

et al. 2015

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Various environmental changes were associated with the Permian-Triassic mass extinction at 252.2 Ma. Diverse unusual sediments and depositional phenomena have been uncovered as responses to environmental and biotic changes. Lithological and detailed conodont biostratigraphic correlations within six Permian-Triassic boundary sections in South China indicate rapid fluctuations in carbonate deposition. Four distinct depositional phases can be recognized: (1) normal carbonate deposition on the platform and slope during the latest Permian; (2) reduced carbonate deposition at the onset of the main extinction horizon; (3) expanded areas of carbonate deposition during the Hindeodus changxingsensis Zone to the H. parvus Zone; and (4) persistent mud-enriched carbonate deposition in the aftermath of the Permian-Triassic transition.Although availability of skeletal carbonate was significantly reduced during the mass extinction, the increase in carbonate deposition did not behave the same way. The rapid carbonate depositional changes, presented in this study, suggest that diverse environmental changes played key roles in the carbonate deposition of the Permian-Triassic mass extinction and onset of its aftermath. An overview of hypotheses to explain these changes implies enhanced terrestrial input, abnormal ocean circulation and various geobiological processes contributed to carbonate saturation fluctuations, as the sedimentary response to large volcanic eruptions.

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“…In the Phanerozoic, carbonate seafloor precipitates are rare although they were widespread in the Paleozoic-Mesozoic transition interval where their precipitations are often associated with oceanic anoxia (e.g., Grotzinger and Knoll 1995;Woods et al 1999Woods et al , 2007Woods et al , 2014Heydari et al 2003;Pruss et al 2006;Baud et al 2007). This secular trend in carbonate seafloor precipitation in Earth's history suggests that the carbonate precipitation has been generally related to oceanic anoxia (e.g., Grotzinger and Knoll 1995;Higgins et al 2009).…”

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confidence: 99%

Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans

Saitoh

Ueno

Isozaki

et al. 2015

Prog. in Earth and Planet. Sci.

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Carbonate precipitation is a major process in the global carbon cycle. It was recently proposed that authigenic carbonate (carbonate precipitated in situ at the sediment-water interface and/or within the sediment) played a major role in the carbon cycle throughout Earth's history. The carbon isotopic composition of authigenic carbonates in ancient oceans have been assumed to be significantly lower than that of dissolved inorganic carbon (DIC) in seawater, as is observed in the modern oceans. However, the δ 13 C carb values of authigenic carbonates in the past has not been analyzed in detail. Here, we report authigenic carbonates in the uppermost Guadalupian (Middle Permian) rocks at Chaotian, Sichuan, South China. Monocrystalline calcite crystals <20 mm long are common in the black mudstone/chert sequence that was deposited on a relatively deep anoxic slope/basin along the continental margin. Textures of the crystals indicate in situ precipitation on the seafloor and/or within the sediments. The calcite precipitation corresponds stratigraphically with denitrification and sulfate reduction in the anoxic deep-water mass, as indicated by previously reported nitrogen and sulfur isotope records, respectively. Relatively high δ 13C carb values of the authigenic carbonates (largely −1 ‰) compared with those of organic matter in the rocks (ca. −26 ‰) suggest that the main carbon source of the carbonates was DIC in the water column. The calcite crystals precipitated in an open system with respect to carbonate, possibly near the sediment-water interface rather than deep within the sediments. The δ 13C carb values of the carbonates were close to the δ 13 C DIC value of seawater due to mixing of 13 C-depleted remineralized organic carbon (that was released into the water column by the water-mass anaerobic respiration) with the large DIC pool in the oceans. Our results imply that δ 13 C carb values of authigenic carbonates in the anoxic oceans might have been systematically different from the values in the oxic oceans in Earth's history, controlled by the depth of the redoxcline in the water column and sediments. If our model is correct, authigenic carbonates with relatively high δ 13C carb values in the ancient anoxic oceans may have had a less substantial influence on the bulk δ 13C carb values in geologic records than has been previously suggested.

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Assessing Early Triassic paleoceanographic conditions via unusual sedimentary fabrics and features

Cited by 73 publications

References 141 publications

Microbial proliferation coinciding with volcanism during the Permian–Triassic transition: New, direct evidence from volcanic ashes, South China

Microbial proliferation coinciding with volcanism during the Permian–Triassic transition: New, direct evidence from volcanic ashes, South China

Rapid carbonate depositional changes following the Permian-Triassic mass extinction: Sedimentary evidence from South China

Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans

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