Arid
DOI10.3986/AGS.7233
THE ISOTOPIC GEOCHEMISTRY OF CaCO3 ENCRUSTATIONS IN TAYLOR VALLEY, ANTARCTICA: IMPLICATIONS FOR THEIR ORIGIN
Lyons, Berry; Foley, Kelly; Carey, Anne; Diaz, Melisa; Bowen, Gabriel; Cerling, Thure
通讯作者Lyons, B (corresponding author), Ohio State Univ, Byrd Polar & Climate Res Ctr, Sch Earth Sci, Columbus, OH 43210 USA.
来源期刊ACTA GEOGRAPHICA SLOVENICA-GEOGRAFSKI ZBORNIK
ISSN1581-6613
EISSN1854-5106
出版年2020
卷号60期号:2页码:125-139
英文摘要Calcium carbonate (CaCO3) encrustations occur in most desert soils, including polar ones, and such encrustations preserve records of geochemical, hydrological, and atmosphere processes affecting these soils. We have collected a series of CaCO3 encrustations found underneath surface rocks in the soils and tills of Taylor Valley, McMurdo Dry Valleys (similar to 78 degrees S lat.), Antarctica. These encrustations were analyzed for Sr-87/S-86 and delta O-18 and delta C-13 to determine what relation they have with the underlying soils, and the material in which they are in contact, and to identify the processes that control their formation. In all but one case, the isotopic data indicate that the source of Sr to these encrustations is not from the rock on which it is associated. The primary source of Sr (and by analogy Ca) is either from dust that has been deposited through aeolian processes or from the aggregate of till material within the soils. The delta C-13 values for Taylor Valley encrustations ranged from 5.7 to 11.0%, and are consistent with a carbon source from atmospheric CO2. The delta O-18 values range from -8.1 to -11.2% and are heavier than expected for equilibrium calcite precipitation from Taylor Valley meteoric water. Taken together these results indicate that the CaCO3 was formed by rapid evaporation of films beneath clasts that had become supersaturated with respect to CaCO3.
英文关键词calcium carbonate isotopic ratio salt deposit McMurdo Dry Valleys Antarctica
类型Article
语种英语
开放获取类型gold
收录类别SCI-E
WOS记录号WOS:000614880400008
WOS关键词MCMURDO DRY VALLEYS ; SOUTHERN VICTORIA LAND ; PEDOGENIC CARBONATE ; SOIL CARBONATE ; STABLE ISOTOPES ; ICE-SHEET ; ROSS SEA ; DESERT ; STRONTIUM ; CLIMATE
WOS类目Geography, Physical
WOS研究方向Physical Geography
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/348680
作者单位[Lyons, Berry; Carey, Anne; Diaz, Melisa] Ohio State Univ, Byrd Polar & Climate Res Ctr, Sch Earth Sci, Columbus, OH 43210 USA; [Foley, Kelly] Ball Corp, Denver, CO USA; [Bowen, Gabriel; Cerling, Thure] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA
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Lyons, Berry,Foley, Kelly,Carey, Anne,et al. THE ISOTOPIC GEOCHEMISTRY OF CaCO3 ENCRUSTATIONS IN TAYLOR VALLEY, ANTARCTICA: IMPLICATIONS FOR THEIR ORIGIN[J],2020,60(2):125-139.
APA Lyons, Berry,Foley, Kelly,Carey, Anne,Diaz, Melisa,Bowen, Gabriel,&Cerling, Thure.(2020).THE ISOTOPIC GEOCHEMISTRY OF CaCO3 ENCRUSTATIONS IN TAYLOR VALLEY, ANTARCTICA: IMPLICATIONS FOR THEIR ORIGIN.ACTA GEOGRAPHICA SLOVENICA-GEOGRAFSKI ZBORNIK,60(2),125-139.
MLA Lyons, Berry,et al."THE ISOTOPIC GEOCHEMISTRY OF CaCO3 ENCRUSTATIONS IN TAYLOR VALLEY, ANTARCTICA: IMPLICATIONS FOR THEIR ORIGIN".ACTA GEOGRAPHICA SLOVENICA-GEOGRAFSKI ZBORNIK 60.2(2020):125-139.
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