Publication Date:
2013-01-05
Description:
We report data on the martian meteorite Northwest Africa (NWA) 7034, which shares some petrologic and geochemical characteristics with known martian meteorites of the SNC (i.e., shergottite, nakhlite, and chassignite) group, but also has some unique characteristics that would exclude it from that group. 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 billion years ago, 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 parts per million extraterrestrial H(2)O released during stepped heating. It also has bulk oxygen isotope values of Delta(17)O = 0.58 +/- 0.05 per mil and a heat-released water oxygen isotope average value of Delta(17)O = 0.330 +/- 0.011 per mil, suggesting the existence of multiple oxygen reservoirs on Mars.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Agee, Carl B -- Wilson, Nicole V -- McCubbin, Francis M -- Ziegler, Karen -- Polyak, Victor J -- Sharp, Zachary D -- Asmerom, Yemane -- Nunn, Morgan H -- Shaheen, Robina -- Thiemens, Mark H -- Steele, Andrew -- Fogel, Marilyn L -- Bowden, Roxane -- Glamoclija, Mihaela -- Zhang, Zhisheng -- Elardo, Stephen M -- New York, N.Y. -- Science. 2013 Feb 15;339(6121):780-5. doi: 10.1126/science.1228858. Epub 2013 Jan 3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Meteoritics, University of New Mexico, Albuquerque, NM 87131, USA. agee@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23287721" target="_blank"〉PubMed〈/a〉
Keywords:
Carbon/analysis
;
Crystallization
;
Iron/analysis
;
Manganese/analysis
;
*Mars
;
*Meteoroids
;
North America
;
Oxygen Isotopes/analysis
;
Radiometric Dating
;
Water/analysis/*chemistry
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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