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首页> 外文期刊>Planetary and space science >Glacial paleoenvironments on Mars revealed by the paucity of hydrated silicates in the Noachian crust of the Northern Lowlands
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Glacial paleoenvironments on Mars revealed by the paucity of hydrated silicates in the Noachian crust of the Northern Lowlands

机译：北部低地诺奇地壳中水合硅酸盐的稀少揭示了火星上的冰川古环境

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摘要

Hydrated silicates occur widespread in thousands of locations in the Martian Noachian-aged southern highlands. If an ocean existed on the northern lowlands of Mars during the Noachian, phyllosilicates are likewise expected to be present in the primeval crust of the Martian plains, since on Earth they are common products of continental fluvial transportation and oceanic sedimentation. Here we analyze data from spaceborne imaging spectrometers searching for Noachian Mg/Al-phyllosilicates in 198 impact craters in the northern lowlands of Mars, as impact-excavated materials have already been demonstrated as qualifying samples of preexisting subsurface deposits. Our results indicate that only 15 impact craters in the Martian lowlands show evidence of excavated Mg/Al-phyllosilicates ( < 10%, consistent with previous estimates). We have also analyzed 88 craters in the highlands region located between -1000 and -3000 m, and in this case the number of craters showing excavated Mg/Al-phyllosilicates was 64 ( > 70%). Therefore, hydrated silicates form a mineralogical dichotomy noticeable in the ancient Noachian crust on a global scale. This is indicative of little or no significant fluvial transportation of phyllosilicate-rich, southern highland materials into the northern basins. But the Noachian phyllosilicate-rich terrains in the southern highlands are heavily dissected by ～ 80,000 valley networks, revealing sustained surface runoff expected to be efficient at remobilizing sediments into the northern plains. The presence of widespread ice masses rimming cold glacial Noachian oceans is a plausible explanation for the lack of large-scale phyllosilicate minerals in the primeval basement of the lowlands of Mars.
机译：水合硅酸盐广泛存在于火星诺亚时代的南部高地的数千个地点。如果在Noachian时期火星的北部低地上存在海洋，则预计在火星平原的原始地壳中也会存在页硅酸盐，因为在地球上，它们是大陆河流运移和海洋沉积的常见产物。在这里，我们分析了来自星载成像光谱仪的数据，该数据在火星北部低地的198个撞击坑中寻找Noachian Mg / Al-页硅酸盐，因为已经证明了撞击挖掘的材料是预先存在的地下沉积物的合格样品。我们的结果表明，火星低地中只有15个撞击坑显示出Mg / Al层状硅酸盐被挖掘的证据（<10％，与先前的估计一致）。我们还分析了位于-1000至-3000 m之间的高地地区的88个陨石坑，在这种情况下，显示出已挖出的Mg / Al-页硅酸盐的陨石坑数量为64（> 70％）。因此，在全球范围内，水合硅酸盐形成了古代Noachian地壳中引人注目的矿物学二分法。这表明富含叶硅酸盐的南部高原材料向北部盆地的河流迁移很少或没有。但是，南部高地上富含Noachian层状硅酸盐的地貌被约80,000个山谷网络严重地剖开，显示出持续的地表径流有望有效地将沉积物迁移到北部平原。在寒冷的诺亚纪冰河边缘环绕着广泛的冰块，这是火星低地原始地下层缺乏大规模页硅酸盐矿物缺乏的合理解释。

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  • 来源
    《Planetary and space science》 |2012年第1期|p.126-133|共8页
  • 作者

    Alberto G. Fairen; Alfonso F. Davila; Dirk Schulze-Makuch; J. Alexis P. Rodriguez; Christopher P. McKay;

  • 作者单位

    Cart Sagan Center for the Study of Life in the Universe, SETI Institute, 189 N Bernardo Ave, Mountain View, CA 94043, USA,Space Science and Astrobiology Division, NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035, USA;

    Cart Sagan Center for the Study of Life in the Universe, SETI Institute, 189 N Bernardo Ave, Mountain View, CA 94043, USA,Space Science and Astrobiology Division, NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035, USA;

    School of Earth and Environmental Sciences, Washington State University, Pullman, WA 99163, USA;

    Planetary Science Institute, 1700 E. Ft Lowell Rd., Suite 106, Tucson, AZ 85719, USA;

    Space Science and Astrobiology Division, NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035, USA;

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  • 正文语种 eng
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  • 关键词

    mars; phyllosilicates; northern lowlands; mars ocean;

    机译：火星;页硅酸盐;北部低地火星海洋;

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