Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.epsl.2010.02.004 |
Evidence for the development of the Andean rain shadow from a Neogene isotopic record in the Atacama Desert, Chile | |
Rech, Jason A.1; Currie, Brian S.1; Shullenberger, Eric D.1; Dunagan, Stan P.2; Jordan, Teresa E.3; Blanco, Nicolas4; Tomlinson, Andrew J.4; Rowe, Harry D.5; Houston, John6 | |
通讯作者 | Rech, Jason A. |
来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS |
ISSN | 0012-821X |
EISSN | 1385-013X |
出版年 | 2010 |
卷号 | 292期号:3-4页码:371-382 |
英文摘要 | Varying ages from Triassic to Pliocene have been proposed for the onset of hyperaridity in the Atacama Desert. The exact timing for the initiation of hyperaridity is critical for determining potential causes, which range from regional effects of global cooling to Andean uplift above elevations conducive to extreme rain shadows. Analysis of the stable isotopic composition of lower Miocene-Quaternary (21-0.015 Ma) palustrine and lacustrine carbonates in the Calama Basin reveals extreme changes in their oxygen and carbon isotopic composition during the Miocene. Limestone delta O-18 values increased by similar to 5 parts per thousand from middle to late Miocene, ranging from -5.5 parts per thousand at 12 Ma to 1 parts per thousand at similar to 6 Ma. Carbon isotopic values increase by 9 parts per thousand over the Neogene, from average values of -3 parts per thousand at 21 Ma to +3 parts per thousand at 12 Ma, and reaching a maximum of +6 parts per thousand at 5 Ma. The increase in oxygen isotopic values occurred over a time span in which the catchment area of the basin experienced significant uplift, causing the delta O-18 value of precipitation to become more negative. We attribute the shift towards higher delta O-18 values to enhanced evaporative enrichment both of soil water or snow prior to infiltration, and within shallow lakes or wetlands prior to carbonate precipitation. The large increase in delta C-13 values was likely caused by a transition from a vegetated landscape influenced primarily by soil-respired CO2 to a landscape largely devoid of vegetation and influenced by atmospheric and volcanic CO2. Isotopic values of palustrine carbonates therefore indicate that hyperaridity commenced in the Calama Basin during the middle to late Miocene, in agreement with other paleoclimatic records from the basin. The cause for the onset of this climate change is thought to be clue to the development of a strong Andean rain shadow associated with the uplift of the Andes to mean elevations >2 km. (C) 2010 Elsevier B.V. All rights reserved. |
英文关键词 | Andes Atacama Desert oxygen isotopes paleoaltimetry rain shadow |
类型 | Article |
语种 | 英语 |
国家 | USA ; Chile ; England |
收录类别 | SCI-E |
WOS记录号 | WOS:000276885800014 |
WOS关键词 | NORTHERN CHILE ; CLIMATE-CHANGE ; INTERANNUAL VARIABILITY ; CENOZOIC CLIMATE ; TIBETAN PLATEAU ; STABLE-ISOTOPES ; SURFACE WATERS ; SOUTH-AMERICA ; CALAMA BASIN ; UPLIFT |
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/2XILL650/163831 |
作者单位 | 1.Miami Univ, Dept Geol, Oxford, OH 45056 USA; 2.Univ Tennessee, Dept Agr Geosci & Nat Resources, Martin, TN 38238 USA; 3.Cornell Univ, Dept Earth & Atmospher Sci, Ithaca, NY 14853 USA; 4.Serv Nacl Geol & Mineria, Santiago, Chile; 5.Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX 76019 USA; 6.20 Six Acres, Shrewsbury SY3 6AF, Salop, England |
推荐引用方式 GB/T 7714 | Rech, Jason A.,Currie, Brian S.,Shullenberger, Eric D.,et al. Evidence for the development of the Andean rain shadow from a Neogene isotopic record in the Atacama Desert, Chile[J],2010,292(3-4):371-382. |
APA | Rech, Jason A..,Currie, Brian S..,Shullenberger, Eric D..,Dunagan, Stan P..,Jordan, Teresa E..,...&Houston, John.(2010).Evidence for the development of the Andean rain shadow from a Neogene isotopic record in the Atacama Desert, Chile.EARTH AND PLANETARY SCIENCE LETTERS,292(3-4),371-382. |
MLA | Rech, Jason A.,et al."Evidence for the development of the Andean rain shadow from a Neogene isotopic record in the Atacama Desert, Chile".EARTH AND PLANETARY SCIENCE LETTERS 292.3-4(2010):371-382. |
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