Thermal and irradiation history of lunar meteorite Dhofar 280

Ekaterina V. Korochantseva, Alexei I. Buikin, Jens Hopp, Cyrill A. Lorenz, Alexander V. Korochantsev, U. Ott, Mario Trieloff

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Dhofar 280 recorded a complex history on the Moon revealed by high-resolution 40Ar-39Ar dating. Thermal resetting occurred less than 1 Ga ago, and the rock was exposed to several impact events before and afterwards. The cosmic ray exposure (CRE) age spectrum indicates a 400 ± 40 Ma CRE on the lunar surface. A unique feature of this lunar sample is a partial loss of cosmogenic 38Ar, resulting in a (low-temperature) CRE age plateau of about 1 Ma. This was likely caused by the same recent impact event that reset the (low-temperature) 40Ar-39Ar age spectrum and preceded the short transit phase to Earth of ≤1 Ma. Dhofar 280 may be derived from KREEP-rich lunar frontside terrains, possibly associated with the Copernicus crater or with a recent impact event on the deposits of the South Pole–Aitken basin. Although Dhofar 280 is paired with Dhofar 081, their irradiation and thermal histories on the Moon were different. An important trapped Ar component in Dhofar 280 is “orphan” Ar with a low 40Ar/36Ar ratio. It is apparently a mixture of two components, one endmember with 40Ar/36Ar = 17.5 ± 0.2 and a second less well-constrained endmember with 40Ar/36Ar ≤10. The presence of two endmembers of trapped Ar, their compositions, and the breccia ages seem to be incompatible with a previously suggested correlation between age or antiquity and the (40Ar/36Ar)trapped ratio (Eugster et al. 2001; Joy et al. 2011a). Alternatively, “orphan” Ar of this impact melt breccia may have an impact origin.

Original languageEnglish
Pages (from-to)2334-2346
Number of pages13
JournalMeteoritics and Planetary Science
Volume51
Issue number12
DOIs
Publication statusPublished - Dec 1 2016

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lunar meteorite
meteorites
irradiation
histories
cosmic rays
breccia
cosmic ray
orphan
moon
history
antiquities
Moon
impact melts
lunar surface
transit
dating
craters
resetting
plateaus
deposits

ASJC Scopus subject areas

  • Geophysics
  • Space and Planetary Science

Cite this

Korochantseva, E. V., Buikin, A. I., Hopp, J., Lorenz, C. A., Korochantsev, A. V., Ott, U., & Trieloff, M. (2016). Thermal and irradiation history of lunar meteorite Dhofar 280. Meteoritics and Planetary Science, 51(12), 2334-2346. https://doi.org/10.1111/maps.12732

Thermal and irradiation history of lunar meteorite Dhofar 280. / Korochantseva, Ekaterina V.; Buikin, Alexei I.; Hopp, Jens; Lorenz, Cyrill A.; Korochantsev, Alexander V.; Ott, U.; Trieloff, Mario.

In: Meteoritics and Planetary Science, Vol. 51, No. 12, 01.12.2016, p. 2334-2346.

Research output: Contribution to journalArticle

Korochantseva, EV, Buikin, AI, Hopp, J, Lorenz, CA, Korochantsev, AV, Ott, U & Trieloff, M 2016, 'Thermal and irradiation history of lunar meteorite Dhofar 280', Meteoritics and Planetary Science, vol. 51, no. 12, pp. 2334-2346. https://doi.org/10.1111/maps.12732
Korochantseva EV, Buikin AI, Hopp J, Lorenz CA, Korochantsev AV, Ott U et al. Thermal and irradiation history of lunar meteorite Dhofar 280. Meteoritics and Planetary Science. 2016 Dec 1;51(12):2334-2346. https://doi.org/10.1111/maps.12732
Korochantseva, Ekaterina V. ; Buikin, Alexei I. ; Hopp, Jens ; Lorenz, Cyrill A. ; Korochantsev, Alexander V. ; Ott, U. ; Trieloff, Mario. / Thermal and irradiation history of lunar meteorite Dhofar 280. In: Meteoritics and Planetary Science. 2016 ; Vol. 51, No. 12. pp. 2334-2346.
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