干旱区生态环境知识资源中心(Arid): Rare calcium chloride-rich soil and implications for the existence of liquid water in a hyperarid environment

Arid

DOI	10.1130/G45642.1
	Rare calcium chloride-rich soil and implications for the existence of liquid water in a hyperarid environment
	Pfeiffer, Marco 1,2; Latorre, Claudio 3,4,5; Gayo, Eugenia 6,7; Amundson, Ronald 1
通讯作者	Pfeiffer, Marco
来源期刊	GEOLOGY
ISSN	0091-7613
EISSN	1943-2682
出版年	2019
卷号	47 期号:2 页码:163-166
英文摘要	We discovered permanently hydrated CaCl2-rich soils in Earth's driest region, the Atacama Desert. The soils contain up to similar to 15% CaCl2. X-ray diffraction indicates the rare minerals sinjarite, schoenite, and tachyhydrite. When water is added, the CaCl2 crust immediately turns white due to an apparent mineralogical phase change from sinjarite to a brine. The surfaces are nearly continuously wet due to the salt's hygroscopicity. The Ca-enriched soils occur in rare exposures, possibly from shallow groundwater. Unlike the surface of adjacent abundant halite crusts, the CaCl2 outcrops remain continuously wet, with up to 12% water under modern, and essentially rainless, climatic conditions. The wet surface stabilizes the land surface and acts as a dust trap. The sediment began accumulating at ca. 14 ka, contains trace quantities of organic carbon, and has total nitrogen that isotopically reflects significant biologically mediated gaseous losses. These deliquescent salts are unique habitats for life within the climatic limits of life on Earth, and are a potential analog for transient liquid-water sources for microorganisms in Martian soils.
类型	Article
语种	英语
国家	USA ; Chile
收录类别	SCI-E
WOS记录号	WOS:000456424300017
WOS关键词	NORTHERN ATACAMA DESERT ; CHILE ; BASIN ; GROUNDWATER ; EVAPORITES ; EVOLUTION ; RECORD ; CRATER ; CORE
WOS类目	Geology
WOS研究方向	Geology
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215979
作者单位	1.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; 2.Univ Chile, Fac Ciencias Agron, Dept Ingn & Suelos, Santiago 11315, Chile; 3.Pontificia Univ Catolica Chile, Dept Ecol, Santiago, Chile; 4.Pontificia Univ Catolica Chile, Ctr UC Desierto Atacama, Santiago, Chile; 5.IEB, Santiago, Chile; 6.Univ Concepcion, Fac Ciencias Nat & Oceanog, Dept Oceanog, Casilla 160-C, Concepcion, Chile; 7.Ctr Ciencia Clima & Resiliencia CR 2, Ave Blanco Encalada 2002, Santiago, Chile
推荐引用方式 GB/T 7714	Pfeiffer, Marco,Latorre, Claudio,Gayo, Eugenia,et al. Rare calcium chloride-rich soil and implications for the existence of liquid water in a hyperarid environment[J]. University of California, Berkeley,2019,47(2):163-166.
APA	Pfeiffer, Marco,Latorre, Claudio,Gayo, Eugenia,&Amundson, Ronald.(2019).Rare calcium chloride-rich soil and implications for the existence of liquid water in a hyperarid environment.GEOLOGY,47(2),163-166.
MLA	Pfeiffer, Marco,et al."Rare calcium chloride-rich soil and implications for the existence of liquid water in a hyperarid environment".GEOLOGY 47.2(2019):163-166.