Arid
DOI10.1002/jgrg.20059
Molecular preservation in halite- and perchlorate-rich hypersaline subsurface deposits in the Salar Grande basin (Atacama Desert, Chile): Implications for the search for molecular biomarkers on Mars
Fernandez-Remolar, D. C.1; Chong-Diaz, G.2; Ruiz-Bermejo, M.1; Harir, M.3; Schmitt-Kopplin, P.3,4; Tziotis, D.3; Gomez-Ortiz, D.5; Garcia-Villadangos, M.1; Martin-Redondo, M. P.1; Gomez, F.1; Rodriguez-Manfredi, J. A.1; Moreno-Paz, M.1; De Diego-Castilla, G.1; Echeverria, A.6; Urtuvia, V. N.6; Blanco, Y.1; Rivas, L.1; Izawa, M. R. M.7; Banerjee, N. R.7; Demergasso, C.6; Parro, V.1
通讯作者Fernandez-Remolar, D. C.
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
ISSN2169-8953
EISSN2169-8961
出版年2013
卷号118期号:2页码:922-939
英文摘要

Similarities between the Atacama Desert (Chile) and Mars include extreme aridity, highly oxidizing chemistry, and intense ultraviolet radiation that promoted the photochemical production of perchlorates and nitrates. Concentration of these ions under hyperarid conditions led to the formation of nitrate- and perchlorate-bearing deposits in ephemeral lakes, followed by later deposition of chlorides and sulfates. At some locations, such as the Salar Grande, hypersaline deposits have remained unaltered for millions of years. We conducted a drilling campaign in deposits of the Salar to characterize the preservation state of biological molecules. A 5m deep discontinuous core was recovered and subjected to multitechnique analysis including the antibody microarray-based biosensor LDChip300 and the SOLID (Signs Of Life Detector) instrument, complemented by geophysical, mineralogical, geochemical, and molecular analysis. We identified two units based on the mineralogy: the upper one, from the surface to similar to 320cm depth characterized by a predominance of halite and anhydrite, and the lower one, from 320 to 520cm, with a drop in halite and anhydrite and an enrichment in nitrate and perchlorate. Organic compounds including biomolecules were detected in association with the different depositional and mineralogical units, demonstrating the high capacity for molecular preservation. Hypersaline environments preserve biomolecules over geologically significant timescales; therefore, salt-bearing materials should be high-priority targets for the search for evidence of life on Mars.


英文关键词preservation Atacama Desert Mars analog Astrobiology
类型Article
语种英语
国家Spain ; Chile ; Germany ; Canada
收录类别SCI-E
WOS记录号WOS:000324913100040
WOS关键词DISSOLVED ORGANIC-MATTER ; HALOPHILIC MICROORGANISMS ; LIFE ; WATER ; CHEMISTRY ; EVOLUTION ; RECORD ; SALTS ; SOIL
WOS类目Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/178428
作者单位1.Ctr Astrobiol INTA CSIC, Torrejon De Ardoz, Spain;
2.Univ Catolica Norte, Dept Geol Sci, Antofagasta, Chile;
3.Helmholtz Ctr Munich, German Res Ctr Environm Hlth, Neuherberg, Germany;
4.Tech Univ Muenchen, Lehrstuhl Chem Tech Anal & Chem Lebensmitteltechn, Freising Weihenstephan, Germany;
5.Univ Rey Juan Carlos, ESCET, Area Geol, Mostoles, Spain;
6.Univ Catolica Norte, Ctr Biotecnol, Antofagasta, Chile;
7.Univ Western Ontario, Dept Earth Sci, London, ON, Canada
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Fernandez-Remolar, D. C.,Chong-Diaz, G.,Ruiz-Bermejo, M.,et al. Molecular preservation in halite- and perchlorate-rich hypersaline subsurface deposits in the Salar Grande basin (Atacama Desert, Chile): Implications for the search for molecular biomarkers on Mars[J],2013,118(2):922-939.
APA Fernandez-Remolar, D. C..,Chong-Diaz, G..,Ruiz-Bermejo, M..,Harir, M..,Schmitt-Kopplin, P..,...&Parro, V..(2013).Molecular preservation in halite- and perchlorate-rich hypersaline subsurface deposits in the Salar Grande basin (Atacama Desert, Chile): Implications for the search for molecular biomarkers on Mars.JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES,118(2),922-939.
MLA Fernandez-Remolar, D. C.,et al."Molecular preservation in halite- and perchlorate-rich hypersaline subsurface deposits in the Salar Grande basin (Atacama Desert, Chile): Implications for the search for molecular biomarkers on Mars".JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES 118.2(2013):922-939.
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