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    The chlorine isotope composition of the moon and implications for an anhydrous mantle (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-08-07
    Description: Arguably, the most striking geochemical distinction between Earth and the Moon has been the virtual lack of water (hydrogen) in the latter. This conclusion was recently challenged on the basis of geochemical data from lunar materials that suggest that the Moon's water content might be far higher than previously believed. We measured the chlorine isotope composition of Apollo basalts and glasses and found that the range of isotopic values [from -1 to +24 per mil (per thousand) versus standard mean ocean chloride] is 25 times the range for Earth. The huge isotopic spread is explained by volatilization of metal halides during basalt eruption--a process that could only occur if the Moon had hydrogen concentrations lower than those of Earth by a factor of approximately 10(4) to 10(5), implying that the lunar interior is essentially anhydrous.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sharp, Z D -- Shearer, C K -- McKeegan, K D -- Barnes, J D -- Wang, Y Q -- New York, N.Y. -- Science. 2010 Aug 27;329(5995):1050-3. doi: 10.1126/science.1192606. Epub 2010 Aug 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87122, USA. zsharp@unm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20688980" target="_blank"〉PubMed〈/a〉
    Keywords: Chlorides/analysis ; Chlorine/*analysis ; Extraterrestrial Environment ; Glass/chemistry ; Hydrogen/*analysis ; Isotopes/analysis ; Metals ; *Moon ; Silicates/chemistry ; Volatilization ; *Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Unique meteorite from early Amazonian Mars: water-rich basaltic breccia Northwest Africa 7034 (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    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
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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    PAPER CURRENT
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