Arid
DOI10.1016/j.chemgeo.2007.07.019
Time series delta Mg-26 analysis in speleothem calcite: Kinetic versus equilibrium fractionation, comparison with other proxies and implications for palaeoclimate research
Buhl, D.; Immenhauser, A.; Smeulders, G.; Kabiri, L.; Richter, D. K.
通讯作者Immenhauser, A.
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
出版年2007
卷号244期号:3-4页码:715-729
英文摘要

Magnesium-isotope time series MC-ICP-MS analyses from a Pleistocene speleothem - collected in a limestone cave in NW Africa (Morocco) - are reported and discussed in a process-oriented context. In addition, high-resolution C, O and Sr-isotope data, and Mg and Sr element abundances were compiled from the same stalagmite. Sub-samples were collected along the stalagmite growth axis and a second data set was drilled perpendicularly within one growth interval (Hendy test). The analytical results show clearly co-variant, systematic and cyclical fluctuations for all proxies collected along the growth axis and - with respect to the analytical error - invariant data within one growth increment. Magnesium-isotope ratios (delta Mg-26) fluctuate between -4.39 parts per thousand +/- 0.02 2 sigma arid -4.17 parts per thousand +/- 0.05 2 sigma and are within the range of published results of speleothem calcite from limestone caves. The difference of 0.22 parts per thousand is significantly beyond the error of the external reproducibility of 0.03 parts per thousand 2 sigma for 626 Mg. Considering the analytical error, neither a purely kinetic nor an equilibrium fractionation process explains the observed isotope pattern. For the time being, it is suggested that two external factors drive the speleothem Mg-isotope cyclicity: (1) climate-driven (arid versus humid) variances in the precipitation rate of a carbonate phase from meteoric water within the karstic system prior to entering the cave system; and (2) changing rates of silicate (aeolian matedal) versus carbonate weathering. Both of these processes fractionate the Mg-isotopic composition of runoff/seepage water. There is evidence that the magnesium-isotope system, applied to spelcothem archives, bears significant information concerning continental climatic variability in arid zones and deserves further research. (C) 2007 Elsevier B.V. All rights reserved.


英文关键词magnesium isotopes speleothems kinetic fractionation equilibrium fractionation climate proxy
类型Article
语种英语
国家Germany ; Netherlands ; Morocco
收录类别SCI-E
WOS记录号WOS:000250284900023
WOS关键词ISOTOPIC COMPOSITION ; MONSOON VARIABILITY ; MG ; MAGNESIUM ; CAVE ; CLIMATE ; GEOCHEMISTRY ; STALAGMITE ; RESOLUTION ; CARBONATE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/153780
作者单位(1)Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44801 Bochum, Germany;(2)Vrije Univ Amsterdam, Fac Earth & Life Sci, NL-1081 HV Amsterdam, Netherlands;(3)FSTE, Dept Geol, SCEEP, LFS, Er Rachidia 52000, Morocco
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Buhl, D.,Immenhauser, A.,Smeulders, G.,et al. Time series delta Mg-26 analysis in speleothem calcite: Kinetic versus equilibrium fractionation, comparison with other proxies and implications for palaeoclimate research[J],2007,244(3-4):715-729.
APA Buhl, D.,Immenhauser, A.,Smeulders, G.,Kabiri, L.,&Richter, D. K..(2007).Time series delta Mg-26 analysis in speleothem calcite: Kinetic versus equilibrium fractionation, comparison with other proxies and implications for palaeoclimate research.CHEMICAL GEOLOGY,244(3-4),715-729.
MLA Buhl, D.,et al."Time series delta Mg-26 analysis in speleothem calcite: Kinetic versus equilibrium fractionation, comparison with other proxies and implications for palaeoclimate research".CHEMICAL GEOLOGY 244.3-4(2007):715-729.
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