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Constraints on the recent rate of lunar ejecta breakdown and implications for crater ages

2014; Geological Society of America; Volume: 42; Issue: 12 Linguagem: Inglês

10.1130/g35926.1

1943-2682

R. R. Ghent, P. O. Hayne, J. L. Bandfield, B. A. Campbell, C. C. Allen, Lynn M. Carter, D. A. Paige,

Space Science and Extraterrestrial Life

Research Article| December 01, 2014 Constraints on the recent rate of lunar ejecta breakdown and implications for crater ages Rebecca R. Ghent; Rebecca R. Ghent 1Department of Earth Sciences, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada2Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, Arizona 85719, USA Search for other works by this author on: GSW Google Scholar Paul O. Hayne; Paul O. Hayne 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA Search for other works by this author on: GSW Google Scholar Joshua L. Bandfield; Joshua L. Bandfield 4Space Science Institute, Boulder, Colorado 80301, USA Search for other works by this author on: GSW Google Scholar Bruce A. Campbell; Bruce A. Campbell 5Center for Earth and Planetary Studies, Smithsonian Institution, Washington, D.C. 20013, USA Search for other works by this author on: GSW Google Scholar Carlton C. Allen; Carlton C. Allen 6NASA Johnson Space Center, Houston, Texas 77058, USA Search for other works by this author on: GSW Google Scholar Lynn M. Carter; Lynn M. Carter 7NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA Search for other works by this author on: GSW Google Scholar David A. Paige David A. Paige 8Department of Earth and Space Sciences, University of California–Los Angeles, Los Angeles, California 90095, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Rebecca R. Ghent 1Department of Earth Sciences, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada2Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, Arizona 85719, USA Paul O. Hayne 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA Joshua L. Bandfield 4Space Science Institute, Boulder, Colorado 80301, USA Bruce A. Campbell 5Center for Earth and Planetary Studies, Smithsonian Institution, Washington, D.C. 20013, USA Carlton C. Allen 6NASA Johnson Space Center, Houston, Texas 77058, USA Lynn M. Carter 7NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA David A. Paige 8Department of Earth and Space Sciences, University of California–Los Angeles, Los Angeles, California 90095, USA Publisher: Geological Society of America Received: 28 May 2014 Revision Received: 06 Sep 2014 Accepted: 11 Sep 2014 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2014 Geological Society of America Geology (2014) 42 (12): 1059–1062. https://doi.org/10.1130/G35926.1 Article history Received: 28 May 2014 Revision Received: 06 Sep 2014 Accepted: 11 Sep 2014 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Rebecca R. Ghent, Paul O. Hayne, Joshua L. Bandfield, Bruce A. Campbell, Carlton C. Allen, Lynn M. Carter, David A. Paige; Constraints on the recent rate of lunar ejecta breakdown and implications for crater ages. Geology 2014;; 42 (12): 1059–1062. doi: https://doi.org/10.1130/G35926.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract We present a new empirical constraint on the rate of breakdown of large ejecta blocks on the Moon based on observations from the Lunar Reconnaissance Orbiter (LRO) Diviner thermal radiometer. We find that the rockiness of fresh crater ejecta can be quantified using the Diviner-derived rock abundance data set, and we present a strong inverse correlation between the 95th percentile value of the ejecta rock abundance (RA95/5) and crater age. For nine craters with published model ages derived from crater counts on their continuous ejecta, RA95/5 decreases with crater age, as (age [m.y.])–0.46. This result implies shorter rock survival times than predicted based on downward extrapolation of 100 m crater size-frequency distributions, and represents a new empirical constraint on the rate of comminution of large rocks not previously analyzed experimentally or through direct observation. In addition, our result provides a new method for dating young lunar craters. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.