globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1769
论文题名:
High-velocity collisions from the lunar cataclysm recorded in asteroidal meteorites
作者: Marchi S.; Bottke W.F.; Cohen B.A.; Wünnemann K.; Kring D.A.; McSween H.Y.; De Sanctis M.C.; O'Brien D.P.; Schenk P.; Raymond C.A.; Russell C.T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:4
起始页码: 303
结束页码: 307
语种: 英语
Scopus关键词: argon isotope ; asteroid ; collision ; degassing ; lunar crust ; meteorite ; solar system ; velocity ; volume
英文摘要: The Moon experienced an intense period of impacts about 4 Gyr ago. This cataclysm is thought to have affected the entire inner Solar System and has been constrained by the radiometric dating of lunar samples: 40Ar -39 Ar ages reflect the heating and degassing of target rocks by large basin-forming impacts on the Moon. Radiometric dating of meteorites from Vesta and the H-chondrite parent body also shows numerous 40Ar -39 Ar ages between 3.4 and 4.1 Gyr ago, despite a different dynamical context, where impacts typically occur at velocities too low to reset geochronometers. Here we interpret the 40Ar-39 Ar age record in meteorites to reflect unusually high impact velocities exceeding 10 km s -1. Compared with typical impact velocities for main-belt asteroids of about 5 km s-1, these collisions would produce 100-1,000 times more highly heated material by volume. We propose that the 40Ar-39 Ar ages between 3.4 and 4.1 Gyr ago from Vesta, the H-chondrite parent body and the Moon record impacts from numerous main-belt asteroids that were driven onto high-velocity and highly eccentric orbits by the effects of the late migration of the giant planets. We suggest that the bombardment persisted for many hundreds of millions of years and affected most inner Solar System bodies. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106812
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: NASA Lunar Science Institute, Southwest Research Institute, Boulder, CO 80302, United States; NASA Marshall Space Flight Center, Huntsville, AB 35805, United States; Museum für Naturkunde, Berlin 10115, Germany; USRA - Lunar and Planetary Institute, NASA Lunar Science Institute, Houston, TX 77058, United States; University of Tennessee, Knoxville, TN 37996, United States; Istituto Nazionale d'Astrofisica, Rome 00133, Italy; Planetary Science Institute, Tucson, AZ 85719, United States; Lunar and Planetary Institute, Houston, TX 77058, United States; Jet Propulsion Laboratory, Pasadena, CA 91109, United States; University of California, Los Angeles, CA 90024, United States

Recommended Citation:
Marchi S.,Bottke W.F.,Cohen B.A.,et al. High-velocity collisions from the lunar cataclysm recorded in asteroidal meteorites[J]. Nature Geoscience,2013-01-01,6(4)
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