English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/36006
Share/Impact:
Statistics
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Astrobiological significance of minerals on Mars surface environment: UV-shielding properties of Fe (jarosite) vs. Ca (gypsum) sulphates

AuthorsAmaral, Gabriel; Martínez-Frías, J. ; Vázquez, Luis
KeywordsUV-radiation
Jarosite
Gypsum
Shielding
Astrobiology
Mars
Jaroso
Sorbas
Issue Date15-Dec-2005
PublisherSpringer
CitationarXiv:physics/0512140v1
AbstractThe recent discovery of liquid water-related sulphates on Mars is of great astrobiological interest. UV radiation experiments, using natural Ca and Fe sulphates (gypsum, jarosite), coming from two selected areas of SE Spain (Jaroso Hydrothermal System and the Sorbas evaporitic basin), were performed using a Xe Lamp with an integrated output from 220 nm to 500 nm of 1.2 Wm-2. The results obtained demonstrate a large difference in the UV protection capabilities of both minerals and also confirm that the mineralogical composition of the Martian regolith is a crucial shielding factor. Whereas gypsum showed a much higher transmission percentage, jarosite samples, with a thickness of only 500 microns, prevented transmission. This result is extremely important for the search for life on Mars as: a) jarosite typically occurs on Earth as alteration crusts and patinas, and b) a very thin crust of jarosite on the surface of Mars would be sufficient to shield microorganisms from UV radiation.
Description18 páginas, 3 figuras.-- Trabajo publicado en Reviews in Environmental Science and Biotechnology 5(2-3): 219-231 (2006); http://dx.doi.org/10.1007/s11157-006-0008-x
Publisher version (URL)http://arxiv.org/abs/physics/0512140
URIhttp://hdl.handle.net/10261/36006
Appears in Collections:(CAB) Artículos
Files in This Item:
File Description SizeFormat 
0512140.pdf290,24 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.