Arid
DOI10.1016/j.gca.2010.06.030
Modeling speleothem delta C-13 variability in a central Sierra Nevada cave using C-14 and Sr-87/Sr-86
Oster, Jessica L.1; Montanez, Isabel P.1; Guilderson, Thomas P.2,4; Sharp, Warren D.3; Banner, Jay L.5
通讯作者Oster, Jessica L.
来源期刊GEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
EISSN1872-9533
出版年2010
卷号74期号:18页码:5228-5242
英文摘要

Carbon isotopes in speleothems can vary in response to a number of complex processes active in cave systems that are both directly and indirectly related to climate. Progressing downward from the soil zone overlying the cave, these processes include soil respiration, fluid-rock interaction in the host limestone, degassing of CO2 and precipitation of calcite upflow from the speleothem drip site, and calcite precipitation at the drip site. Here we develop a new approach to independently constrain the roles of water-rock interaction and soil processes in controlling stalagmite delta C-13. This approach uses the dead carbon proportion (dcp) estimated from coupled C-14 and Th-230/U measurements, in conjunction with Sr isotope analyses on stalagmite calcite from a central Sierra Nevada foothills cave in California, a region characterized by a highly seasonal Mediterranean-type climate, to determine the roles of water-rock interaction and soil processes in determining stalagmite delta C-13. Increases in stalagmite dcp between 16.5 and 8.8 ka are coincident with decreased delta C-13, indicating a varying yet substantial contribution from the soil organic matter (SOM) reservoir, likely due to significantly increased average age of SOM in the soil veneer above the cave during wet climatic intervals.


We use geochemical and isotope mixing models to estimate the host-carbonate contribution throughout the delta C-13 time series and determine the degree of degassing and calcite precipitation that occurred prior to precipitation of stalagmite calcite. The degree of degassing and prior calcite precipitation we calculate varies systematically with other climate indicators, with less degassing and prior calcite precipitation occurring during wetter climatic intervals and more during drier intervals. Modeled delta C-13 values and degassing calculations suggest that some degree of prior calcite precipitation is necessary at all time intervals to explain measured stalagmite delta C-13 values, even during relatively wet intervals. These results illustrate the importance of constraining degassing and prior calcite precipitation in the interpretation of speleothem delta C-13 records, particularly those from caves that formed in seasonal semi-arid to arid environments. (C) 2010 Elsevier Ltd. All rights reserved.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000281094900006
WOS关键词SOUTHWESTERN UNITED-STATES ; STABLE-ISOTOPE VARIATIONS ; HIGH-RESOLUTION ; TRACE-ELEMENT ; LATE PLEISTOCENE ; CARBON-DIOXIDE ; OXYGEN-ISOTOPE ; NORTH-ATLANTIC ; CLIMATE-CHANGE ; YOUNGER DRYAS
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构University of California, Davis
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/164276
作者单位1.Univ Calif Davis, Dept Geol, Davis, CA 95616 USA;
2.Lawrence Livermore Natl Lab, Ctr AMS, Livermore, CA USA;
3.Berkeley Geochronol Ctr, Berkeley, CA USA;
4.Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA;
5.Univ Texas Austin, Austin, TX 78712 USA
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Oster, Jessica L.,Montanez, Isabel P.,Guilderson, Thomas P.,et al. Modeling speleothem delta C-13 variability in a central Sierra Nevada cave using C-14 and Sr-87/Sr-86[J]. University of California, Davis,2010,74(18):5228-5242.
APA Oster, Jessica L.,Montanez, Isabel P.,Guilderson, Thomas P.,Sharp, Warren D.,&Banner, Jay L..(2010).Modeling speleothem delta C-13 variability in a central Sierra Nevada cave using C-14 and Sr-87/Sr-86.GEOCHIMICA ET COSMOCHIMICA ACTA,74(18),5228-5242.
MLA Oster, Jessica L.,et al."Modeling speleothem delta C-13 variability in a central Sierra Nevada cave using C-14 and Sr-87/Sr-86".GEOCHIMICA ET COSMOCHIMICA ACTA 74.18(2010):5228-5242.
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