Thermal and irradiation history of lunar meteorite Dhofar 280
Abstract Dhofar 280 recorded a complex history on the Moon revealed by high‐resolution 40 Ar‐ 39 Ar 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 o...
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crwiley:10.1111/maps.12732 2023-12-03T10:30:24+01:00 Thermal and irradiation history of lunar meteorite Dhofar 280 Korochantseva, Ekaterina V. Buikin, Alexei I. Hopp, Jens Lorenz, Cyrill A. Korochantsev, Alexander V. Ott, Ulrich Trieloff, Mario Russian Foundation for Basic Research 2016 http://dx.doi.org/10.1111/maps.12732 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12732 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12732 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 51, issue 12, page 2334-2346 ISSN 1086-9379 1945-5100 Space and Planetary Science Geophysics journal-article 2016 crwiley https://doi.org/10.1111/maps.12732 2023-11-09T14:35:31Z Abstract Dhofar 280 recorded a complex history on the Moon revealed by high‐resolution 40 Ar‐ 39 Ar 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 38 Ar, 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) 40 Ar‐ 39 Ar 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 40 Ar/ 36 Ar ratio. It is apparently a mixture of two components, one endmember with 40 Ar/ 36 Ar = 17.5 ± 0.2 and a second less well‐constrained endmember with 40 Ar/ 36 Ar ≤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 ( 40 Ar/ 36 Ar) trapped ratio (Eugster et al. 2001; Joy et al. 2011a). Alternatively, “orphan” Ar of this impact melt breccia may have an impact origin. Article in Journal/Newspaper South pole Wiley Online Library (via Crossref) Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) South Pole Meteoritics & Planetary Science 51 12 2334 2346 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Space and Planetary Science Geophysics |
spellingShingle |
Space and Planetary Science Geophysics Korochantseva, Ekaterina V. Buikin, Alexei I. Hopp, Jens Lorenz, Cyrill A. Korochantsev, Alexander V. Ott, Ulrich Trieloff, Mario Thermal and irradiation history of lunar meteorite Dhofar 280 |
topic_facet |
Space and Planetary Science Geophysics |
description |
Abstract Dhofar 280 recorded a complex history on the Moon revealed by high‐resolution 40 Ar‐ 39 Ar 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 38 Ar, 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) 40 Ar‐ 39 Ar 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 40 Ar/ 36 Ar ratio. It is apparently a mixture of two components, one endmember with 40 Ar/ 36 Ar = 17.5 ± 0.2 and a second less well‐constrained endmember with 40 Ar/ 36 Ar ≤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 ( 40 Ar/ 36 Ar) trapped ratio (Eugster et al. 2001; Joy et al. 2011a). Alternatively, “orphan” Ar of this impact melt breccia may have an impact origin. |
author2 |
Russian Foundation for Basic Research |
format |
Article in Journal/Newspaper |
author |
Korochantseva, Ekaterina V. Buikin, Alexei I. Hopp, Jens Lorenz, Cyrill A. Korochantsev, Alexander V. Ott, Ulrich Trieloff, Mario |
author_facet |
Korochantseva, Ekaterina V. Buikin, Alexei I. Hopp, Jens Lorenz, Cyrill A. Korochantsev, Alexander V. Ott, Ulrich Trieloff, Mario |
author_sort |
Korochantseva, Ekaterina V. |
title |
Thermal and irradiation history of lunar meteorite Dhofar 280 |
title_short |
Thermal and irradiation history of lunar meteorite Dhofar 280 |
title_full |
Thermal and irradiation history of lunar meteorite Dhofar 280 |
title_fullStr |
Thermal and irradiation history of lunar meteorite Dhofar 280 |
title_full_unstemmed |
Thermal and irradiation history of lunar meteorite Dhofar 280 |
title_sort |
thermal and irradiation history of lunar meteorite dhofar 280 |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1111/maps.12732 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12732 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12732 |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken South Pole |
geographic_facet |
Aitken South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Meteoritics & Planetary Science volume 51, issue 12, page 2334-2346 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/maps.12732 |
container_title |
Meteoritics & Planetary Science |
container_volume |
51 |
container_issue |
12 |
container_start_page |
2334 |
op_container_end_page |
2346 |
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1784256216621383680 |