Carbon isotopic evidence for organic matter oxidation in soils of the Old Red Sandstone (Silurian to Devonian, South Wales, UK)

Brasier, A. T., Morris, Jennifer ORCID: https://orcid.org/0000-0002-7453-3841 and Hillier, R. D. 2014. Carbon isotopic evidence for organic matter oxidation in soils of the Old Red Sandstone (Silurian to Devonian, South Wales, UK). Journal of the Geological Society 171 (5) , pp. 621-634. 10.1144/jgs2013-136

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Abstract

Petrographic and calcrete carbon isotope data from seasonally waterlogged Upper Silurian (Přídolí) to Lower Devonian (Pragian) palaeo-Vertisols of the Old Red Sandstone, South Wales, UK, are presented. The δ13C values mostly range from −9 to −12‰ (VPDB), suggesting that the soils were inhabited by abundant vegetation that when oxidized (perhaps with microbial assistance) resulted in CO2-rich soils. Such soils would favour calcrete precipitation through equilibration of soil zone CO2 with the relatively lower atmospheric pCO2. However, reliably estimating palaeoatmospheric pCO2 using these carbon isotope data is a challenge. Supplementary material: Detailed information on stable isotope measurement methods, descriptions of the samples, and carbon and oxygen isotope data are available at www.geolsoc.org.uk/SUP18754.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	Geological Society
ISSN:	0016-7649
Funders:	Geological Society of London
Date of Acceptance:	10 April 2014
Last Modified:	03 Nov 2022 09:40
URI:	https://orca.cardiff.ac.uk/id/eprint/105668

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