Evidence for common breakup events of the acapulcoites‐lodranites and chondrites
Abstract— Acapulcoites and lodranites are believed to originate on a common parent body and to represent some of the earliest events in the differentiation of the chondritic asteroids. We have conducted isotopic studies of the noble gases He, Ne, Ar, Kr, and Xe, and determinations of the concentrati...
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crwiley:10.1111/j.1945-5100.2000.tb01491.x 2023-12-03T10:13:40+01:00 Evidence for common breakup events of the acapulcoites‐lodranites and chondrites TERRIBILINI, Dario EUGSTER, Otto HERZOG, Gregory F. SCHNABEL, Christoph 2000 http://dx.doi.org/10.1111/j.1945-5100.2000.tb01491.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2000.tb01491.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2000.tb01491.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 35, issue 5, page 1043-1050 ISSN 1086-9379 1945-5100 Space and Planetary Science Geophysics journal-article 2000 crwiley https://doi.org/10.1111/j.1945-5100.2000.tb01491.x 2023-11-09T13:17:00Z Abstract— Acapulcoites and lodranites are believed to originate on a common parent body and to represent some of the earliest events in the differentiation of the chondritic asteroids. We have conducted isotopic studies of the noble gases He, Ne, Ar, Kr, and Xe, and determinations of the concentrations of the major elements and of the radionuclides 10 Be, 26 Al, and 36 Cl in an attempt to constrain the cosmic‐ray exposure history of two members of the acapulcoite‐lodranite clan recovered in Antarctica: Frontier Mountain (FRO) 95029 and Graves Nunataks (GRA) 95209. From cosmic‐ray‐produced 3 He, 21 Ne, and 38 Ar and appropriate production rates, we derive parent‐body breakup times of 4.59 ± 0.60 and 6.82 ± 0.60 Ma for FOR 95029 and GRA 95209, respectively. These times are consistent with those obtained from the pairs 10 Be‐ 21 Ne and 26 Al‐ 21 Ne; whereas the times inferred from the pair 36 Cl‐ 36 Ar are slightly longer, perhaps because the 36 Cl activities decreased as a result of decay on Earth. Terrestrial ages up to ∼50 ka for the two meteorites are consistent with the measured 36 Cl activities of the metal phases. All acapulcoites and lodranites dated until now show cosmic‐ray exposure ages in the range of 4–10 Ma. This is the same range as that found for the major exposure age cluster of the H chondrites. As a common parent body is improbable on the basis of the O‐isotopic systematics, a common set of impactors might have affected the asteroid belt 4–10 Ma ago. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library (via Crossref) Frontier Mountain ENVELOPE(160.333,160.333,-72.983,-72.983) Graves Nunataks ENVELOPE(-141.500,-141.500,-86.717,-86.717) Meteoritics & Planetary Science 35 5 1043 1050 |
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 TERRIBILINI, Dario EUGSTER, Otto HERZOG, Gregory F. SCHNABEL, Christoph Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
topic_facet |
Space and Planetary Science Geophysics |
description |
Abstract— Acapulcoites and lodranites are believed to originate on a common parent body and to represent some of the earliest events in the differentiation of the chondritic asteroids. We have conducted isotopic studies of the noble gases He, Ne, Ar, Kr, and Xe, and determinations of the concentrations of the major elements and of the radionuclides 10 Be, 26 Al, and 36 Cl in an attempt to constrain the cosmic‐ray exposure history of two members of the acapulcoite‐lodranite clan recovered in Antarctica: Frontier Mountain (FRO) 95029 and Graves Nunataks (GRA) 95209. From cosmic‐ray‐produced 3 He, 21 Ne, and 38 Ar and appropriate production rates, we derive parent‐body breakup times of 4.59 ± 0.60 and 6.82 ± 0.60 Ma for FOR 95029 and GRA 95209, respectively. These times are consistent with those obtained from the pairs 10 Be‐ 21 Ne and 26 Al‐ 21 Ne; whereas the times inferred from the pair 36 Cl‐ 36 Ar are slightly longer, perhaps because the 36 Cl activities decreased as a result of decay on Earth. Terrestrial ages up to ∼50 ka for the two meteorites are consistent with the measured 36 Cl activities of the metal phases. All acapulcoites and lodranites dated until now show cosmic‐ray exposure ages in the range of 4–10 Ma. This is the same range as that found for the major exposure age cluster of the H chondrites. As a common parent body is improbable on the basis of the O‐isotopic systematics, a common set of impactors might have affected the asteroid belt 4–10 Ma ago. |
format |
Article in Journal/Newspaper |
author |
TERRIBILINI, Dario EUGSTER, Otto HERZOG, Gregory F. SCHNABEL, Christoph |
author_facet |
TERRIBILINI, Dario EUGSTER, Otto HERZOG, Gregory F. SCHNABEL, Christoph |
author_sort |
TERRIBILINI, Dario |
title |
Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
title_short |
Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
title_full |
Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
title_fullStr |
Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
title_full_unstemmed |
Evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
title_sort |
evidence for common breakup events of the acapulcoites‐lodranites and chondrites |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1111/j.1945-5100.2000.tb01491.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.2000.tb01491.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.2000.tb01491.x |
long_lat |
ENVELOPE(160.333,160.333,-72.983,-72.983) ENVELOPE(-141.500,-141.500,-86.717,-86.717) |
geographic |
Frontier Mountain Graves Nunataks |
geographic_facet |
Frontier Mountain Graves Nunataks |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Meteoritics & Planetary Science volume 35, issue 5, page 1043-1050 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.2000.tb01491.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
35 |
container_issue |
5 |
container_start_page |
1043 |
op_container_end_page |
1050 |
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1784260516930125824 |