Isotopic studies of Yucca Mountain soil fluids and carbonate pedogenesis
- Geological Survey, Denver, CO (United States)
Secondary carbonates occurring within the soils, faults, and subsurface fractures of Yucca Mountain contain some of the best available records of paleoclimate and paleohydrology for the potential radioactive waste repository site. This article discusses conceptual and analytical advances being made with regard to the interpretation of stable isotope data from pedogenic carbonates, specifically related to the {sup 13}C content of soil CO{sub 2}, CaCO{sub 3} precipitation mechanisms, and isotopic fractionations between parent fluids and precipitating carbonates. The {sup 13}C content of soil carbon dioxide from Yucca Mountain and vicinity shows most of the usual patterns expected in such contexts: decreasing {sup 13}C content with depth (due mainly to increased importance of respired CO{sub 2}), decreasing {sup 13}C with altitude (partially due to relatively more C-3 vegetation), and reduced {sup 13}C during spring (due again to higher rates of respiration, and reduced gas permeability of wet soils). These patterns exist within the domain of a noisy data set; soil and vegetational heterogeneities, weather, and other factors apparently contribute to isotopic variability in the system. Several soil calcification mechanisms appear to be important, involving characteristic physical and chemical environments and isotopic fractionations. When CO{sub 2} loss from thin soil solutions is an important driving factor, carbonates may contain excess heavy isotopes, compared to equilibrium precipitation with soil fluids. When root calcification serves as a proton generator for plant absorption of soil nutrients, heavy isotope deficiencies are likely. Successive cycles of dissolution and reprecipitation mix and redistribute pedogenic carbonates, and tend to isotopically homogenize and equilibrate pedogenic carbonates with soil fluids.
- Research Organization:
- American Society of Civil Engineers (ASCE), New York, NY (United States); American Nuclear Society (ANS), La Grange Park, IL (United States)
- OSTI ID:
- 60989
- Report Number(s):
- CONF-940553-Vol.4; TRN: 94:010821-0099
- Resource Relation:
- Conference: International high-level radioactive waste management conference, Las Vegas, NV (United States), 22-26 May 1994; Other Information: PBD: 1994; Related Information: Is Part Of High Level Radioactive Waste Management: Proceedings of the fifth annual international conference. Volume 4; PB: 1048 p.
- Country of Publication:
- United States
- Language:
- English
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