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  Factors and processes governing the 14C content of carbonate in desert soils

Amundson, R., Wang, Y., Chadwick, O., Trumbore, S. E., McFadden, L., McDonald, E., et al. (1994). Factors and processes governing the 14C content of carbonate in desert soils. Earth and Planetary Science Letters, 125(1-4), 385-405. doi:10.1016/0012-821X(94)90228-3.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-12CD-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-12D0-5
Genre: Journal Article

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Amundson, R., Author
Wang, Y., Author
Chadwick, O., Author
Trumbore, Susan E.1, Author              
McFadden, L., Author
McDonald, E., Author
Wells, S., Author
DeNiro, M., Author
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1External Organizations, ou_persistent22              

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Free keywords: stable isotope chemistry radiocarbon measurements pedogenic carbonate organic-matter arid zone ages dynamics climate dioxide nevada
 Abstract: A model is presented describing the factors and processes which determine the measured C-14 ages of soil calcium carbonate. Pedogenic carbonate forms in isotopic equilium with soil CO2. Carbon dioxide in soils is a mixture of CO2 derived from two biological sources: respiration by living plant roots and respiration of microorganisms decomposing soil humus. The relative proportion of these two CO2 Sources can greatly affect the initial C-14 content of pedogenic carbonate: the greater the contribution of humus-derived CO2, the greater the initial C-14 age of the carbonate mineral. For any given mixture Of CO2 Sources, the steady-state (CO2)-C-14 distribution vs. soil depth can be described by a production/diffusion model. As a soil ages, the C-14 age of soil humus increases, as does the steady-state C-14 age of soil CO2 and the initial C-14 age of any pedogenic carbonate which forms. The mean C-14 age of a complete pedogenic carbonate coating or nodule will underestimate the true age of the soil carbonate. This discrepancy increases the older a soil becomes. Partial removal of outer (and younger) carbonate coatings greatly improves the relationship between measured C-14 age and true age. Although the production/diffusion model qualitatively explains the C-14 age of pedogenic carbonate vs. soil depth in many soils, other factors, such as climate change, may contribute to the observed trends, particularily in soils older than the Holocene.

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Language(s): eng - English
 Dates: 1994
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: Other: BEX479
DOI: 10.1016/0012-821X(94)90228-3
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Title: Earth and Planetary Science Letters
  Other : Earth Planet. Sci. Lett.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 125 (1-4) Sequence Number: - Start / End Page: 385 - 405 Identifier: ISSN: 0012-821X
CoNE: https://pure.mpg.de/cone/journals/resource/954925395406