globalchange  > 气候减缓与适应
DOI: 10.1029/2017JE005421
Scopus记录号: 2-s2.0-85050473116
论文题名:
Reexamination of Early Lunar Chronology With GRAIL Data: Terranes, Basins, and Impact Fluxes
作者: Evans A.J.; Andrews-Hanna J.C.; Head J.W.; III; Soderblom J.M.; Solomon S.C.; Zuber M.T.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:7
起始页码: 1596
结束页码: 1617
语种: 英语
英文关键词: lunar chronology ; lunar impact basins ; lunar terrane ages ; Moon
英文摘要: Flooding of the lunar surface by ancient mare basalts has rendered uncertain the ages of lunar geochemical terranes and several impact basins. Here we combine craters having recognizable surface expressions with craters identified only by their gravitational signatures in Gravity Recovery and Interior Laboratory data to reassess the chronological sequence of lunar impact basins and the ages of major lunar geochemical terranes. Our results indicate that although volcanically flooded regions are deficient in craters with diameters greater than 20 km by more than 50% relative to unflooded regions, craters with diameters greater than 90 km can be readily recognized either by topography or by gravity anomaly. On the basis of the areal density of craters with diameters greater than 90 km we conclude that (1) the Serenitatis basin could be as young as the Imbrium basin; (2) the areal density of craters within the Procellarum KREEP Terrane is significantly lower than that for the South Pole-Aitken basin and the Feldspathic Highlands Terrane; (3) if the youngest age of final crystallization of the lunar magma ocean is adopted as a lower bound on the age of the Procellarum KREEP Terrane, a minimum age of approximately 4.3 Ga is inferred for ~40% of lunar impact basins, including South Pole-Aitken; and (4) the flux of impactors capable of forming craters with diameters of at least 90 km decreased substantially through the Nectarian and Imbrian periods. ©2018. American Geophysical Union. 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/113613
Appears in Collections:气候减缓与适应

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作者单位: Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; Southwest Research Institute, Boulder, CO, United States; Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC, United States

Recommended Citation:
Evans A.J.,Andrews-Hanna J.C.,Head J.W.,et al. Reexamination of Early Lunar Chronology With GRAIL Data: Terranes, Basins, and Impact Fluxes[J]. Journal of Geophysical Research: Planets,2018-01-01,123(7)
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