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Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia Northwest Africa 7034.
MedLine Citation:
PMID:  23287721     Owner:  NLM     Status:  Publisher    
We report data on the martian meteorite, Northwest Africa (NWA) 7034, which shares some petrologic and geochemical characteristics with known martian (SNC, i.e., Shergottite, Nakhlite, and Chassignite) meteorites, but also possesses some unique characteristics that would exclude it from the current SNC grouping. NWA 7034 is a geochemically enriched crustal rock compositionally similar to basalts and average martian crust measured by recent rover and orbiter missions. It formed 2.089 ± 0.081 Ga, during the early Amazonian epoch in Mars' geologic history. NWA 7034 has an order of magnitude more indigenous water than most SNC meteorites, with up to 6000 ppm extraterrestrial H(2)O released during stepped heating. It also has bulk oxygen isotope values of Δ(17)O = 0.58 ± 0.05‰ and a heat-released water oxygen isotope average value of Δ(17)O = 0.330 ± 0.011‰, suggesting the existence of multiple oxygen reservoirs on Mars.
Carl B Agee; Nicole V Wilson; Francis M McCubbin; Karen Ziegler; Victor J Polyak; Zachary D Sharp; Yemane Asmerom; Morgan H Nunn; Robina Shaheen; Mark H Thiemens; Andrew Steele; Marilyn L Fogel; Roxane Bowden; Mihaela Glamoclija; Zhisheng Zhang; Stephen M Elardo
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-3
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  -     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, USA.
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