Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.epsl.2017.04.014 |
Lithium isotopes in speleothems: Temperature-controlled variation in silicate weathering during glacial cycles | |
von Strandmann, Philip A. E. Pogge1,2,3; Vaks, Anton3,4; Bar-Matthews, Miryam4; Ayalon, Avner4; Jacob, Ezekiel3; Henderson, Gideon M.3 | |
通讯作者 | von Strandmann, Philip A. E. Pogge |
来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS
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ISSN | 0012-821X |
EISSN | 1385-013X |
出版年 | 2017 |
卷号 | 469页码:64-74 |
英文摘要 | Terrestrial chemical weathering of silicate minerals is a fundamental component of the global cycle of carbon and other elements. Past changes in temperature, rainfall, ice cover, sea-level and physical erosion are thought to affect weathering but the relative impact of these controls through time remains poorly constrained. This problem could be addressed if the nature of past weathering could be constrained at individual sites. In this study, we investigate the use of speleothems as local recorders of the silicate weathering proxy, Li isotopes. We analysed delta Li-7 and [Li] in speleothems that formed during the past 200 ka in two well-studied Israeli caves (Soreq and Tzavoa), as well as in the overlying soils and rocks. Leaching and mass balance of these soils and rocks show that Li is dominantly sourced from weathering of the overlying aeolian silicate soils. Speleothem delta 7Li values are ubiquitously higher during glacials (similar to 23%) than during interglacials(similar to 10%(0)), implying more congruent silicate weathering during interglacials (where "congruent" means a high ratio of primary mineral dissolution to secondary mineral formation). These records provide information on the processes controlling weathering in Israel. Consideration of possible processes causing this change of weathering congruency indicates a primary role for temperature, with higher temperatures causing more congruent weathering (lower delta Li-7(speieo)). The strong relationship observed between speleothem delta Li-7 and climate at these locations suggests that Li isotopes may be a powerful tool with which to understand the local controls on weathering at other sites, and could be used to assess the distribution of weathering changes accompanying climate change, such as that of Pleistocene glacial cycles. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | weathering glaciation climate lithium isotopes temperature |
类型 | Article |
语种 | 英语 |
国家 | England ; Israel |
收录类别 | SCI-E |
WOS记录号 | WOS:000402444700006 |
WOS关键词 | EASTERN MEDITERRANEAN REGION ; SOREQ CAVE ; NEGEV DESERT ; INTERGLACIAL VARIATIONS ; SECONDARY MINERALS ; ARABIAN DESERT ; GRAIN-SIZE ; CLIMATE ; LI ; DUST |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | University of London ; University of Oxford |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/198333 |
作者单位 | 1.UCL, Inst Earth & Planetary Sci, London Geochem & Isotope Ctr LOGIC, Gower St, London WC1E 6BT, England; 2.Birkbeck Univ London, Gower St, London WC1E 6BT, England; 3.Univ Oxford, Dept Earth Sci, South Parks Rd, Oxford, England; 4.Geol Survey Israel, 30 Malkhey Israel St, IL-9550161 Jerusalem, Israel |
推荐引用方式 GB/T 7714 | von Strandmann, Philip A. E. Pogge,Vaks, Anton,Bar-Matthews, Miryam,et al. Lithium isotopes in speleothems: Temperature-controlled variation in silicate weathering during glacial cycles[J]. University of London, University of Oxford,2017,469:64-74. |
APA | von Strandmann, Philip A. E. Pogge,Vaks, Anton,Bar-Matthews, Miryam,Ayalon, Avner,Jacob, Ezekiel,&Henderson, Gideon M..(2017).Lithium isotopes in speleothems: Temperature-controlled variation in silicate weathering during glacial cycles.EARTH AND PLANETARY SCIENCE LETTERS,469,64-74. |
MLA | von Strandmann, Philip A. E. Pogge,et al."Lithium isotopes in speleothems: Temperature-controlled variation in silicate weathering during glacial cycles".EARTH AND PLANETARY SCIENCE LETTERS 469(2017):64-74. |
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