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Incipient Space Weathering Observed on the Surface of Itokawa Dust Particles

机译:丝川尘埃表面观测到的初期空间风化

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摘要

The reflectance spectra of the most abundant meteorites, ordinary chondrites, are different from those of the abundant S-type (mnemonic for siliceous) asteroids. This discrepancy has been thought to be due to space weathering, which is an alteration of the surfaces of airless bodies exposed to the space environment. Here we report evidence of space weathering on particles returned from the S-type asteroid 25143 Itokawa by the Hayabusa spacecraft. Surface modification was found in 5 out of 10 particles, which varies depending on mineral species. Sulfur-bearing Fe-rich nanoparticles exist in a thin (5 to 15 nanometers) surface layer on olivine, low-Ca pyroxene, and plagioclase, which is suggestive of vapor deposition. Sulfur-free Fe-rich nanoparticles exist deeper inside (<60 nanometers) ferromagnesian silicates. Their texture suggests formation by metamictization and in situ reduction of Fe~2+.
机译:最丰富的陨石(普通球粒陨石)的反射光谱与丰富的S型(硅质助记符)小行星的反射光谱不同。人们认为这种差异是由于空间风化引起的,这是暴露于空间环境的无气物体表面的变化。在这里,我们报告了the鸟号航天飞机从S型小行星25143 Itokawa返回的粒子上存在空间风化的证据。在10个颗粒中,有5个发现了表面改性,这取决于矿物种类。富含硫的铁纳米颗粒存在于橄榄石,低钙辉石和斜长石上的薄表层(5至15纳米)中,这表明有气相沉积。富含铁的无硫纳米颗粒存在于铁锰硅酸盐内部更深(<60纳米)。它们的质地表明是由Fe〜2 +的代谢和原位还原形成的。

著录项

  • 来源
    《Science》 |2011年第6046期|p.1121-1125|共5页
  • 作者单位

    College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito,Ibaraki 310-8512, Japan;

    Department of Earth Science, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;

    College of Science, Ibaraki University, 2-1-1 Bunkyo, Mito,Ibaraki 310-8512, Japan;

    Astromaterials Research and Exploration Science Directorate, NASA, Johnson Space Center, 2101 NASA Parkway, Houston, TX 77058, USA;

    Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan;

    Hitachi High-Technologies, 882 Ichige, Hitachinaka, Ibaraki 312-8504 Japan;

    Hitachi High-Technologies, 882 Ichige, Hitachinaka, Ibaraki 312-8504 Japan;

    Department of Earth Science, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;

    Department of Earth Science, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Institute of Space and Aeronautical Science,Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuoku, Sagamihara, Kanagawa 252-5210, Japan;

    Department of Earth and Planetary Science, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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