δ13C values of carbonate nodules across the Permian–Triassic boundary in the Karoo Supergroup (South Africa) reflect a stinking sulfurous swamp, not atmospheric CO2

Tabor, Neil J.; Montañez, Isabel P.; Steiner, Maureen B.; Schwindt, Dylan M.

doi:10.1016/j.palaeo.2006.11.047

Cited by 71 publications

(53 citation statements)

References 31 publications

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“…9), they are mainly from Triassic Alfisols (Type F palaeosols) and Triassic groundwater Aridisols (Type E palaeosols) in the Mescheryakovka section, which also have obvious morphological evidence for a groundwater origin and are very different in morphology to the Sedibo palaeosols (cf. Retallack, Smith & Ward, 2003) analysed by Tabor et al (2007). The geochemical data therefore suggest that the majority of the studied palaeosol nodules do not have a groundwater origin, but instead formed in an open system in equilibrium with atmospheric CO 2.…”

Section: B Lacustrine/groundwater Originmentioning

confidence: 80%

“…Based on their interpretations of the isotopic signature of calcitic palaeosols, Tabor et al (2007) argue that in a Karoo Basin Permian-Triassic section, palaeosols were isolated from the atmosphere during their formation, under permanently waterlogged conditions. The authors argued that δ 13 C values of pedogenic calcite that fall within +14.8‰ of the δ 13 C isotopic composition of co-occurring organic matter can be entirely explained through the CO 2 produced during oxidation of organic matter in a closed system (Tabor et al 2007).…”

Section: B Lacustrine/groundwater Originmentioning

confidence: 99%

“…The Late Permian period was an important time in Earth history, marked by extreme climate change and biotic crisis (e.g. Kidder & Worsley, 2005;Erwin, 2008), with evidence of increased seasonality, at least in the southern hemisphere (Tabor et al 2007;Gastaldo & Rolerson, 2008;Pace, Gastaldo & Neveling, 2009;Kearsey et al 2009). Palaeosol nodules with an unusual mineralogy have been recorded at, or very close to, the latest Permian mass extinction horizon in Antarctica, reflecting the specific atmospheric and climatic conditions associated with the biotic crisis (Sheldon & Retallack, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Palaeosol nodules with an unusual mineralogy have been recorded at, or very close to, the latest Permian mass extinction horizon in Antarctica, reflecting the specific atmospheric and climatic conditions associated with the biotic crisis (Sheldon & Retallack, 2002). Palaeosol morphology and composition vary across the Permian-Triassic boundary, which may be a response to changes in climate and atmosphere (Retallack & Krull, 1999;Krull & Retallack, 2000;Macleod et al 2000;Ward et al 2005;Tabor et al 2007;de la Horra et al 2008;Gastaldo & Rolerson, 2008).…”

Section: Introductionmentioning

confidence: 99%

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The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

2011

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-Pedogenic carbonate nodules from six sections spanning the continental Permian-Triassic boundary in the South Urals, Russia, were analysed. Morphological, petrographic, SEM and XRD analyses have demonstrated that many of the latest Permian palaeosols are dolomitic. This dolomite forms the microcrystalline (5-16 μm) groundmass of the nodules. Later diagenetic phases, represented by coarser crystalline textures, were identified as calcite. Isotopic analysis of the microcrystalline dolomite has revealed it to be similar in isotopic composition to authigenic dolomite forming today in saline soils in Alberta, Canada. These data indicate that the dolomite found in these nodules is pedogenic, and formed in equilibrium with the atmosphere. Upper Permian pedogenic dolocretes in the studied sections are most frequent in (a) palaeosols that formed on palaeo-highs and (b) in the latest Permian period (Changhsingian), which may indicate that there was an increase in seasonality and evaporation in the South Urals region at this time. The presence of only calcitic palaeosols in the earliest Triassic may reflect a subsequent dramatic change in the basin conditions, possibly relating to the Permian-Triassic mass extinction, which stopped the conditions that are necessary for dolomite formation.

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Section: B Lacustrine/groundwater Originmentioning

confidence: 80%

Section: B Lacustrine/groundwater Originmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

2011

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“…In the cases where pedogenic carbonates reflect the incorporation of atmospheric CO 2 , it is possible to reconstruct paleoclimates and, in turn, paleoprecipitation regimes (e.g., Tabor & Montañ ez, 2002). There are numerous Tertiary-age examples based on multiple proxies (pedogenic carbonates and tooth enamel; e.g., Koch et al, 1995Koch et al, , 2003, with fewer further back in deeper time.…”

Section: Paleosynecology-putting Together a Communitymentioning

confidence: 99%

Plant Paleoecology in Deep Time¹

DiMichele¹,

Gastaldo²

2008

Annals of the Missouri Botanical Garden

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The paleoecology of plants as a modern discipline, distinct from traditional floristics or biostratigraphy, has undergone an enormous expansion in the past 20 years. In addition to baseline studies characterizing extinct plants and plant assemblages in terms of their growth habits, environmental preferences, and patterns of association, paleoecology has converged on neoecology and represents a means to extend our basic understanding of the world and to contribute to the theoretical framework of ecology, writ large. Reconstruction of whole plants, including studies of physiology and developmental biology, and analyses of biomechanics have become mainstays of autecological studies. Assemblage studies now are informed by sophisticated taphonomic models that have helped guide sampling strategies and helped with the interpretation of statistical data. Linkages of assemblage patterns in space and time with sedimentology, geochemical proxies for atmospheric composition and climate, paleosol analyses, and increasingly refined geochronological and sequence stratigraphic data have permitted paleoecologists to examine rates and extents of vegetational response to environmental change and to time intervals of quiescent climatic conditions. Studies of plant-animal interaction, explicit consideration of phylogenetic information in assessing assemblage time-space dynamics, and examination of ecological structure in terms of developing metabolic scaling theory are all having direct impact on paleoecological as well as neoecological studies. The growth of paleoecology shows no sign of diminishment-closer linkages with neoecology are needed.

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A Review of Stratigraphic, Geochemical, and Paleontologic Data of the Terrestrial End-Permian Record in the Karoo Basin, South Africa

Neveling¹,

Gastaldo²,

Kamo³

et al. 2016

Origin and Evolution of the Cape Mountains and Karoo Basin

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δ13C values of carbonate nodules across the Permian–Triassic boundary in the Karoo Supergroup (South Africa) reflect a stinking sulfurous swamp, not atmospheric CO2

Cited by 71 publications

References 31 publications

The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

Plant Paleoecology in Deep Time¹

A Review of Stratigraphic, Geochemical, and Paleontologic Data of the Terrestrial End-Permian Record in the Karoo Basin, South Africa

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δ13C values of carbonate nodules across the Permian–Triassic boundary in the Karoo Supergroup (South Africa) reflect a stinking sulfurous swamp, not atmospheric CO2

Cited by 71 publications

References 31 publications

The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

The origin and significance of pedogenic dolomite from the Upper Permian of the South Urals of Russia

Plant Paleoecology in Deep Time1

A Review of Stratigraphic, Geochemical, and Paleontologic Data of the Terrestrial End-Permian Record in the Karoo Basin, South Africa

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Product

Resources

About

Plant Paleoecology in Deep Time¹