• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >The construction of Chasma Boreale on Mars
【24h】

The construction of Chasma Boreale on Mars

机译：在火星上建造Chasma Boreale

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The polar layered deposits of Mars contain the planet's largest known reservoir of water ice and the prospect of revealing a detailed Martian palaeoclimate record, but the mechanisms responsible for the formation of the dominant features of the north polar layered deposits (NPLD) are unclear, despite decades of debate. Stratigraphic analyses of the exposed portions of Chasma Boreale-a large canyon 500 km long, up to 100 km wide, and nearly 2 km deep-have led most researchers to favour an erosional process for its formation following initial NPLD accumulation. Candidate mechanisms include the catastrophic outburst of water, protracted basal melting, erosional undercutting, aeolian down-cutting and a combination of these processes. Here we use new data from the Mars Reconnaissance Orbiter to show that Chasma Boreale is instead a long-lived, complex feature resulting primarily from non-uniform accumulation of the NPLD. The initial valley that later became Chasma Boreale was matched by a second, equally large valley that was completely filled in by subsequent deposition, leaving no evidence on the surface to indicate its former presence. We further demonstrate that topography existing before the NPLD began accumulating influenced successive episodes of deposition and erosion, resulting in most of the present-day topography. Long-term and large-scale patterns of mass balance achieved through sedimentary processes, rather than catastrophic events, ice flow or highly focused erosion, have produced the largest geomorphic anomaly in the north polar ice of Mars.
机译：火星的极地分层沉积物包含了地球上最大的已知水冰储层，并有望揭示详细的火星古气候记录，但是尽管形成了北极极地分层沉积物（NPLD）的主要特征，但其机制尚不清楚数十年的辩论。对Chasma Boreale裸露部分的地层分析（长500 km，宽100 km，深近2 km的大峡谷）使大多数研究人员赞成初始NPLD堆积后形成的侵蚀过程。候选机制包括水的灾难性爆发，持续的基础融化，侵蚀性底切，风成岩下切以及这些过程的组合。在这里，我们使用来自火星侦察轨道飞行器的新数据来证明，Chasma Boreale实际上是长期存在的复杂特征，主要是由于NPLD的不均匀积累所致。后来变成Chasma Boreale的最初山谷与第二个同样大的山谷相匹配，随后被随后的沉积完全填满，表面上没有证据表明它曾经存在过。我们进一步证明，在NPLD开始积累之前存在的地形影响了沉积和侵蚀的连续发作，从而导致了当今的大多数地形。通过沉积过程而不是灾难性事件，冰流或高度集中的侵蚀而实现的长期，大规模的质量平衡模式，在火星的北极北极冰中产生了最大的地貌异常。

著录项

  • 来源
    《Nature》 |2010年第7297期|p.446-449|共4页
  • 作者

    J. W. Holt; K. E. Fishbaugh; S. Byrne; S. Christian; K. Tanaka; P. S. Russell; K. E. Herkenhoff; A. Safaeinili; N. E. Putzig; R. J. Phillips;

  • 作者单位

    Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin 78758, Texas, USA;

    Smithsonian National Air and Space Museum, Washington 20560, District of Columbia, USA;

    Lunar and Planetary Laboratory, University of Arizona, Tucson 85721, Arizona, USA;

    Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin 78758, Texas, USA Bryn Mawr College, Bryn Mawr 19010, Pennsylvania, USA;

    Astrogeology Science Center, US Geological Survey, Flagstaff 86001, Arizona, USA;

    Planetary Science Institute, Tucson 85719, Arizona, USA;

    Astrogeology Science Center, US Geological Survey, Flagstaff 86001, Arizona, USA;

    Jet Propulsion Laboratory, Pasadena 91109, California, USA;

    Southwest Research Institute, Boulder 80302, Colorado, USA;

    Southwest Research Institute, Boulder 80302, Colorado, USA;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号