δ13C and δ18O values of Triassic brachiopods and carbonate rocks as proxies for coeval seawater and palaeotemperature

Korte, Christoph; Kozur, Heinz W.; Veizer, Ján

doi:10.1016/j.palaeo.2005.05.018

Cited by 261 publications

(196 citation statements)

References 81 publications

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“…The stable isotope composition of samples from Pizzo Mondell is within the range of seawater δ 13 C estimated by Korte et al (2005) for the Rhaetian (ca. 1 to 2.5 ‰), and in agreement with results of stable isotopic analyses on unaltered brachiopod shells from the Rhaetian of the Northern Calcareous Alps (Mette et al, 2012).…”

Section: Carbon Isotope Composition Of Carbonatesupporting

confidence: 71%

The calcareous nannofossil Prinsiosphaera achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the δ13C of bulk carbonate

et al. 2013

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Abstract. The onset of pelagic biomineralization was a milestone in the history of the long-term inorganic carbon cycle: as soon as calcareous nannofossils became major limestone producers, the pH and supersaturation state of the global ocean were stabilized (the so-called mid-Mesozoic revolution). But although it is known that calcareous nannofossils were abundant already by the end of the Triassic, no estimates exist on their contribution to hemipelagic carbonate sedimentation. With this work, we estimate the volume proportion of Prinsiosphaera, the dominant late Triassic calcareous nannofossil, in hemipelagic and pelagic carbonates of western Tethys. The investigated Upper Triassic lime mudstones are composed essentially of microspar and tests of calcareous nannofossils, plus minor bioclasts. Prinsiosphaera had become a significant component of lime mudstones since the late Norian, and was contributing up to ca. 60 % of the carbonate by the late Rhaetian in periplatform environments with hemipelagic sedimentation. The increasing proportion of Prinsiosphaera in upper Rhaetian hemipelagic lime mudstones is paralleled by an increase of the δ 13 C of bulk carbonate. We interpreted this isotopic trend as related to the diagenesis of microspar, which incorporated respired organic carbon with a low δ 13 C when it formed during shallow burial. As the proportion of nannofossil tests increased, the contribution of microspar with low δ 13 C diminished, determining the isotopic trend. We suggest that a similar diagenetic effect may be observed in many Mesozoic limestones with a significant, but not yet dominant, proportion of calcareous plankton.

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Section: Carbon Isotope Composition Of Carbonatesupporting

confidence: 71%

The calcareous nannofossil Prinsiosphaera achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the δ13C of bulk carbonate

et al. 2013

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“…6 the isotopic data are grouped in a hypothetic trend of changing stable isotope composition, reflecting the diagenetic environments in which the cement and the other analysed carbonate sediments precipitated. In conclusion, the isotopic data indicate that most of the analysed samples were precipitated from solutions similar to marine Triassic waters (Korte et al 2005).…”

Section: Diagenetic Historymentioning

confidence: 73%

“…Hypothetic trend of changing stable isotope composition in carbonate cement, micrite and dolomite, in the lower Middle Anisian section of the Caerace Formation. Isotopic composition of Triassic seawater based on data from brachiopod shells (Veizer et al 1999;Korte et al 2005) is indicated by the grey field…”

mentioning

confidence: 99%

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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“…Además, los valores isotópicos de carbono y oxígeno (Figura 7, Tabla 2) se encuentran dentro del rango reportado ampliamente en la literatura para el Triásico (e.g. Veizer et al, 1999;Korte et al, 2005;Prokoph et al, 2008), lo cual respalda esta hipótesis.…”

Section: Sánchez-beristain Y López-esquivel Kranksithunclassified

Análisis geoquímico (elementos mayores, menores, traza, δ13C, δ18O y tierras raras) de microbialitas selectas provenientes de la Formación San Casiano (Triásico Medio - Superior, NE de Italia)

Sánchez‐Beristain¹,

Kranksith²

2011

BSGM

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Análisis geoquímico de microbialitas de la Formación San Casiano 399 ResumenSe presentan los resultados del análisis geoquímico de 28 elementos (mayores, menores, traza y tierras raras), así como de isótopos de carbono y oxígeno aplicado a 17 muestras microbialíticas provenientes de la Formación San Casiano (NE de Italia). Dicho análisis ha permitido caracterizar la composición de las microbialitas como calcitas magnesianas (> 4.00 % mol Mg), determinar su buen estado de preservación y detectar la presencia de sedimentación siliciclástica fina durante su crecimiento. Asimismo, ha permitido inferir las condiciones rédox del paleoambiente y comparar sus señales geoquímicas con los componentes esqueléticos, alomicritas y cementos en busca de relictos metabólicos y/o de actividad biológica a partir de ciertos elementos traza.Para efectuar este análisis se utilizaron dos métodos: la Espectrometría de Plasma-Masa Inductivamente Acoplada por Ablación Láser (LA-ICP-MS), y espectrometría de masas para la medición de isótopos estables de carbono y oxígeno. Las muestras presentan un contenido medianamente alto de silicio y aluminio. Dichos elementos reflejan la sedimentación de arcillas durante el crecimiento de las microbialitas. No existe una correlación entre los valores de Mn/Sr y δ 18 O o entre δ 13 C y δ 18 O, indicando así una ausencia de efectos de diagénesis meteórica. Las concentraciones de hierro y manganeso exhiben correlaciones medias con el azufre, lo que permite ligar el origen de estos elementos con fenómenos diagenéticos tempranos, mismos que se pueden constatar por medio del alto contenido de estroncio y de los valores de δ 18 O. Las microbialitas están enriquecidas con una amplia gama de elementos menores y traza. Se corrobora la ausencia de implicación biológica conocida para algunos elementos (Rb, Ti, Zr, Nb y Th), que se encuentran asociados con algunos elementos mayores, reiterando su origen terrigénico (r 2 con Si >0.5). Otros (Zn, Sb, Cr, V, Sn, Ni, Co) no presentan asociación alguna con silicio o aluminio, pero tampoco pueden ser considerados como relictos metabolismo microbiano debido a su enriquecimiento en fases abióticas. En cambio, algunos de estos elementos (Cr, V, Ni, Co) son útiles para determinar las condiciones rédox del paleoambiente de la Formación San Casiano como ligeramente disóxico. Solamente el cobre y el molibdeno están relacionados a un origen microbiano. El molibdeno sirve adicionalmente para reiterar las condiciones rédox inferidas. Los resultados del análisis de Tierras Raras no son conclusivos, toda vez que las concentraciones de fósforo, silicio y aluminio alteran significativamente la precipitación de las mismas. Debido a la excelente preservación del material estudiado, es posible interpretar las señales geoquímicas obtenidas como primarias.

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δ13C and δ18O values of Triassic brachiopods and carbonate rocks as proxies for coeval seawater and palaeotemperature

Cited by 261 publications

References 81 publications

The calcareous nannofossil <i>Prinsiosphaera</i> achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the <i>δ</i><sup>13</sup>C of bulk carbonate

The calcareous nannofossil <i>Prinsiosphaera</i> achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the <i>δ</i><sup>13</sup>C of bulk carbonate

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

Análisis geoquímico (elementos mayores, menores, traza, δ13C, δ18O y tierras raras) de microbialitas selectas provenientes de la Formación San Casiano (Triásico Medio - Superior, NE de Italia)

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δ13C and δ18O values of Triassic brachiopods and carbonate rocks as proxies for coeval seawater and palaeotemperature

Cited by 261 publications

References 81 publications

The calcareous nannofossil &lt;i&gt;Prinsiosphaera&lt;/i&gt; achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C of bulk carbonate

The calcareous nannofossil &lt;i&gt;Prinsiosphaera&lt;/i&gt; achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C of bulk carbonate

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

Análisis geoquímico (elementos mayores, menores, traza, δ13C, δ18O y tierras raras) de microbialitas selectas provenientes de la Formación San Casiano (Triásico Medio - Superior, NE de Italia)

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The calcareous nannofossil <i>Prinsiosphaera</i> achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the <i>δ</i><sup>13</sup>C of bulk carbonate

The calcareous nannofossil <i>Prinsiosphaera</i> achieved rock-forming abundances in the latest Triassic of western Tethys: consequences for the <i>δ</i><sup>13</sup>C of bulk carbonate