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

Rebecca R. Ghent, Paul O. Hayne, Joshua L. Bandfield, Bruce A. Campbell, Carlton C. Allen, Lynn M. Carter and David A. Paige
Constraints on the recent rate of lunar ejecta breakdown and implications for crater ages
Geology (Boulder) (October 2014) 42 (12): 1059-1062

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 95 (super th) percentile value of the ejecta rock abundance (RA (sub 95/5) ) and crater age. For nine craters with published model ages derived from crater counts on their continuous ejecta, RA (sub 95/5) decreases with crater age, as (age [m.y.]) (super -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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 12
Title: Constraints on the recent rate of lunar ejecta breakdown and implications for crater ages
Affiliation: University of Toronto, Department of Earth Sciences, Toronto, ON, Canada
Pages: 1059-1062
Published: 20141024
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 25
Accession Number: 2014-102344
Categories: Extraterrestrial geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Secondary Affiliation: Jet Propulsion Laboratory, USA, United StatesSpace Science Institute, USA, United StatesSmithsonian Institution, USA, United StatesNASA, Johnson Space Center, USA, United StatesNASA, Goddard Space Flight Center, USA, United StatesUniversity of California, Los Angeles, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201451
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