NDLI: Ages of Globally Distributed Lunar Paleoregoliths and Soils from 3.9 Ga to the Present

Content Provider	Springer Nature Link
Author	Fagan, Amy L. Joy, Katherine H. Bogard, Donald D. Kring, David A.
Copyright Year	2014
Abstract	This study determines the ages of 191 discrete lunar regolith samples from the Apollo, Luna, and meteorite collections. Model closure ages (for lithified breccias) and appearance ages (for unconsolidated soils) are calculated using the trapped $^{40}$Ar and $^{36}$Ar abundances of each sample, determined from published Ar data. Model closure ages of regolith breccias span ~3.9 to 0.01 Ga and appearance ages of soils range from ~3.6 to 0.03 Ga; 169 of these ages are published here for the first time, while 22 are recalculated ages. The regolith breccias with the oldest closure ages originate from the ancient highlands and oldest mare surfaces sampled by the Apollo missions. Soils generally have similar ages to each other, regardless of location and collection depth, with most model ages <2.0 Ga. Together, the soils and regolith breccias represent a record of regolith processes over the past 3.9 Ga. The data illustrate that individual landing sites can provide a diversity of ages, which has implications for planning future missions. Differences in maturity between older and younger regolith samples may reflect a change in collisional regimes over time. We note, too, that the closure ages published here are critical data needed for selecting temporally appropriate regolith samples used to decipher the diversity of impactors hitting the lunar surface over time and how the Sun has changed in time.
Starting Page	59
Ending Page	71
Page Count	13
File Format	PDF
ISSN	01679295
Journal	Earth, Moon, and Planets
Volume Number	112
Issue Number	1-4
e-ISSN	15730794
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-05-23
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Moon Regolith Closure age Bombardment history Astronomy, Observations and Techniques Planetology Extraterrestrial Physics, Space Sciences Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Ages of Globally Distributed Lunar Paleoregoliths and Soils from 3.9 Ga to the Present

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