Parallel trends in organic and inorganic carbon isotopes across the Permian/Triassic boundary

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ID: 293397
1992
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Abstract
Stable carbon isotope ratios in both inorganic and organic reservoirs have been widely applied to model environmental and sedimentological changes on a global scale. Most studies dealing with major extinction events have used the record of inorganic carbon. In this paper the authors report the relation between shifts in carbon-13 content of organic matter and coexisting carbonate fractions at a major extinction event, the Permian/Triassic boundary. They found that both [delta][sup 13]C[sub carb] and [delta][sup 13]C[sub org] of the surface ocean varied dramatically across the boundary, but the fractionation [Delta][sup 13]C between organic matter and carbonate remained constant. This result appreciably restricts the interpretation of changes in the carbon cycle during this critical interval. The new data are best explained by a combination of two mechanisms for variation in [delta][sup 13]C[sub carb]: (1) burial and erosion of organic carbon, with a long time constant; and (2) sequestration of organic carbon into shallow and deep oceanic reservoirs, with a shorter time constant. For application to their case, the first mechanism is limited by possible buildup of marine pCO[sub 2], which would increase the isotopic fractionation factor. The second mechanism is limited in application to short-term transient variations in [delta][sup 13]C. Modelingmore » of the carbon cycle and its variations of [delta][sup 13]C must take both mechanisms into account.« less
Reference Key
openalex_W1966077680 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Mordeckai Magaritz, Rajasekar Krishnamurthy, William T. Holser
Journal american journal of science
Year 1992
DOI
10.2475/ajs.292.10.727
URL
https://ajs.scholasticahq.com/article/60579.pdf
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