首页> 外文期刊>Nature >Origin and implications of non-radial Imbrium Sculpture on the Moon
【24h】

Origin and implications of non-radial Imbrium Sculpture on the Moon

机译:非放射状月球雕塑的起源和意义

获取原文
获取原文并翻译 | 示例
           

摘要

Rimmed grooves, lineations and elongate craters around Mare Imbrium shape much of the nearside Moon. This pattern was coined the Imbrium Sculpture(1), and it was originally argued that it must have been formed by a giant oblique (similar to 30 degrees) impact, a conclusion echoed by later studies(2). Some investigators, however, noticed that many elements of the Imbrium Sculpture are not radial to Imbrium, thereby implicating an endogenic or structural origin(3,4). Here we use these non-radial trends to conclude that the Imbrium impactor was a proto-planet (half the diameter of Vesta), once part of a population of large proto-planets in the asteroid belt. Such independent constraints on the sizes of the Imbrium and other basin-forming impactors markedly increase estimates for the mass in the asteroid belt before depletion caused by the orbital migration of Jupiter and Saturn(5). Moreover, laboratory impact experiments, shock physics codes and the groove widths indicate that multiple fragments (up to 2% of the initial diameter) from each oblique basin-forming impactor, such as the one that formed Imbrium, should have survived planetary collisions and contributed to the heavy impact bombardment between 4.3 and 3.8 billion years ago.
机译:母马Imbrium周围的镶边凹槽,线条和细长的环形山形成了附近月球的大部分形状。这种图案是由Imbrium Sculpture(1)创造的,最初有人认为它一定是由巨大的倾斜(类似于30度)撞击形成的,这一结论在后来的研究中得到了回应(2)。然而,一些研究者注意到,“ Imbrium雕塑”的许多元素并非与“ Imbrium”呈放射状,因此暗示了内生或结构起源(3,4)。在这里,我们使用这些非径向趋势得出结论,认为Imbrium撞击器是原行星(维斯塔直径的一半),曾经是小行星带中大型原行星人口的一部分。这种对Imbrium和其他盆地形成撞击器尺寸的独立约束显着增加了由木星和土星的轨道迁移引起的小行星带质量在耗尽之前的质量估计(5)。此外,实验室冲击实验,冲击物理代码和凹槽宽度表明,每个倾斜盆地形成撞击器的多个碎片(不超过初始直径的2%),例如形成Imbrium的撞击器,应能幸免于行星碰撞并做出贡献。在4.3到38亿年前的猛烈轰炸中

著录项

  • 来源
    《Nature》 |2016年第7612期|391-394|共4页
  • 作者单位

    Brown Univ, Dept Earth Environm & Planetary Sci, 324 Brook St, Providence, RI 02912 USA;

    Sandia Natl Labs, POB 5800,MS 0840, Albuquerque, NM 87185 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