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Unique Meteorite from Early Amazonian Mars: Water-Rich Basaltic Breccia Northwest Africa 7034

机译：亚马逊早期火星上的独特陨石：富水玄武岩角砾岩西北非洲7034

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摘要

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_2O released during stepped heating. It also has bulk oxygen isotope values of Δ~(17)O = 0.58 ±0.05 per mil and a heat-released water oxygen isotope average value of Δ~(17)O = 0.330 ± 0.011 per mil, suggesting the existence of multiple oxygen reservoirs on Mars.
机译：我们报告了火星陨石西北非洲（NWA）7034的数据，该数据与SNC已知的火星陨石（即，黑钙铁矿，珍珠岩和变辉石）具有一些岩石学和地球化学特征，但也有一些独特的特征可以将其排除在外从那个小组。 NWA 7034是一种富含地球化学成分的地壳岩石，其成分类似于玄武岩和最近的火星探测器和轨道飞行器任务所测量的平均火星地壳。在火星地质历史的早期亚马逊时代，它形成了2.089±0.081亿年前。 NWA 7034的原生水比大多数SNC陨石多一个数量级，在逐步加热过程中释放出的百万分之六十的地球外H_2O。它的体氧同位素值Δ〜（17）O = 0.58±0.05每密耳，放热的水氧同位素平均值Δ〜（17）O = 0.330±0.011每密耳，表明存在多种氧火星上的水库。

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  • 来源
    《Science》 |2013年第6121期|780-785|共6页
  • 作者

    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;

  • 作者单位

    Institute of Meteoritics, University of New Mexico, Albuquerque,NM 87131, USA,Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Institute of Meteoritics, University of New Mexico, Albuquerque,NM 87131, USA,Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Institute of Meteoritics, University of New Mexico, Albuquerque,NM 87131, USA,Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Institute of Meteoritics, University of New Mexico, Albuquerque,NM 87131, USA;

    Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA;

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA;

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA;

    Geophysical Lab,Carnegie Institution of Washington, Washington, DC 20005,USA;

    Geophysical Lab,Carnegie Institution of Washington, Washington, DC 20005,USA;

    Geophysical Lab,Carnegie Institution of Washington, Washington, DC 20005,USA;

    Geophysical Lab,Carnegie Institution of Washington, Washington, DC 20005,USA;

    Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA,School of Environmental Science and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;

    Institute of Meteoritics, University of New Mexico, Albuquerque,NM 87131, USA,Department of Earth and Planetary Sciences,University of New Mexico, Albuquerque, NM 87131, USA;

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