Arid
DOI10.1016/j.chemgeo.2017.05.004
Isotopic characterization of late Neogene travertine deposits at Barrancas Blancas in the eastern Atacama Desert, Chile
Quade, J.1; Rasbury, E. T.2; Huntington, K. W.3; Hudson, A. M.4; Vonhof, H.5; Anchukaitis, K.6; Betancourt, J.7; Latorre, C.8,9; Pepper, M.1
通讯作者Quade, J.
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
EISSN1872-6836
出版年2017
卷号466页码:41-56
英文摘要

Here we explore the potential of spring-related, surface and subsurface carbonates as an archive of paleoenvironmental change at Barrancas Blancas, located in the broadest and driest sector of the Atacama Desert at 24.5 degrees S. From these deposits we present a new stable isotopic record of paleoenvironmental conditions over portions of the past similar to 11.5 Ma. U-Pb dates from the carbonates, both surface and subsurface, demonstrate that springs have discharged at this location over much of the last 11.5 Ma, attesting to the exceptional geomorphic stability of the central Atacama. Many of the sampled vein systems line vertical fissures, and formed within the aquifer before groundwater discharged at the surface. Carbonates in such circumstances should not undergo off-gassing and kinetic fractionation prior to formation, simplifying the interpretation of their isotopic composition. Oxygen isotopic compositions of carbonates are generally high (> - 5 parts per thousand VPDB), and using paleospring water temperatures of 3-13 degrees C reconstructed from clumped isotopes, point to strongly (up to 50%) evaporated water isotope values, like those associated with the hyperarid core of the Atacama Desert today. Carbon isotopic compositions are also high (>= + 3 parts per thousand PDB), reflecting a recharge area essentially devoid of plants and dominated by volcanic CO2, as is the case today. Our isotopic results are very similar to those from the Calama Basin to the north, suggesting that the western face of the Andes between 21 and 25 degrees S has been highly evaporative and nearly plantless when these springs discharged over the last 11.5 Ma. The spring carbonates at Barrancas Blancas strongly resemble those found at Devils Hole and Furnace Creek in Death Valley, USA, and as such warrant further exploration as potential archives of climate change.


英文关键词Andes Atacama Desert Travertine Stable isotopes U-Pb dating Fluid inclusions Devils Hole
类型Article
语种英语
国家USA ; Germany ; Chile
收录类别SCI-E
WOS记录号WOS:000407861200004
WOS关键词CLUMPED-ISOTOPE ; DEVILS-HOLE ; CENTRAL ANDES ; STABLE-ISOTOPES ; SURFACE WATERS ; NORTHERN CHILE ; CLIMATE-CHANGE ; PUNA PLATEAU ; RECORD ; OXYGEN
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构University of Arizona ; United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198079
作者单位1.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA;
2.SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11797 USA;
3.Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA;
4.US Geol Survey, Geosci & Environm Change Sci Ctr, Denver Fed Ctr, POB 25046,MS 980, Lakewood, CO 80225 USA;
5.Max Planck Inst Chem, Hahn Meitnerweg 1, D-55128 Mainz, Germany;
6.Univ Arizona, Sch Geog & Dev, Tucson, AZ 85721 USA;
7.US Geol Survey, Natl Res Program, Water Miss Area, Mail Stop 430, Reston, VA 20192 USA;
8.Pontificia Univ Catolica Chile, Dept Ecol, Alameda 340, Santiago, Chile;
9.CASEB, Inst Ecol & Biodivers, Santiago, Chile
推荐引用方式
GB/T 7714
Quade, J.,Rasbury, E. T.,Huntington, K. W.,et al. Isotopic characterization of late Neogene travertine deposits at Barrancas Blancas in the eastern Atacama Desert, Chile[J]. University of Arizona, United States Geological Survey,2017,466:41-56.
APA Quade, J..,Rasbury, E. T..,Huntington, K. W..,Hudson, A. M..,Vonhof, H..,...&Pepper, M..(2017).Isotopic characterization of late Neogene travertine deposits at Barrancas Blancas in the eastern Atacama Desert, Chile.CHEMICAL GEOLOGY,466,41-56.
MLA Quade, J.,et al."Isotopic characterization of late Neogene travertine deposits at Barrancas Blancas in the eastern Atacama Desert, Chile".CHEMICAL GEOLOGY 466(2017):41-56.
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