Cosmogenic records in Antarctic meteorites
Aliquot samples of twenty-nine Antarctic L and H chondrites were analyzed for their nuclear track records and 53 Mn activities. Track density in the analyzed samples range from 10 4 to ~ 6×10 6 cm -2 . An important finding is the observation of track-rich grains in a set of four L3 chondrites ALHA 7...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier Science
1983
|
Subjects: | |
Online Access: | http://repository.ias.ac.in/14664/ http://linkinghub.elsevier.com/retrieve/pii/0012821X8390047X |
id |
ftindianacasci:oai:repository.ias.ac.in:14664 |
---|---|
record_format |
openpolar |
spelling |
ftindianacasci:oai:repository.ias.ac.in:14664 2023-05-15T13:46:24+02:00 Cosmogenic records in Antarctic meteorites Goswami, J. N. Nishiizumi, K. 1983-07 http://repository.ias.ac.in/14664/ http://linkinghub.elsevier.com/retrieve/pii/0012821X8390047X unknown Elsevier Science Goswami, J. N. Nishiizumi, K. (1983) Cosmogenic records in Antarctic meteorites Earth and Planetary Science Letters, 64 (1). pp. 1-8. ISSN 0012-821X Article PeerReviewed 1983 ftindianacasci 2013-01-20T10:05:41Z Aliquot samples of twenty-nine Antarctic L and H chondrites were analyzed for their nuclear track records and 53 Mn activities. Track density in the analyzed samples range from 10 4 to ~ 6×10 6 cm -2 . An important finding is the observation of track-rich grains in a set of four L3 chondrites ALHA 77215, 77216, 77217 and 77252, suspected to belong to the same fall based on petrographic observations. An additional sample, ALHA 78105, a L6 chondrite, also contains track-rich grains. 53 Mn activity is at near saturation level in ~65% of the analyzed samples indicating exposure ages > 10 m.y. in these cases. Very few H chondrites from the 7-m.y. exposure age peak are apparently sampled among the ones analyzed in this study. About 6% and 4% respectively of the Antarctic H and L chondrites, analyzed so far for their cosmogenic records, have precompaction irradiation features. Combined analysis of 53 Mn and nuclear track data allowed us to confirm or rule out the proposed pairing of several sets of Antarctic meteorites, and also to estimate the preatmospheric sizes of some of these meteorites. The results indicate that most of the small Antarctic meteorites (< 1 kg) have suffered high (> 95%) ablation mass-loss. Article in Journal/Newspaper Antarc* Antarctic Indian Academy of Sciences: Publication of Fellows Antarctic The Antarctic |
institution |
Open Polar |
collection |
Indian Academy of Sciences: Publication of Fellows |
op_collection_id |
ftindianacasci |
language |
unknown |
description |
Aliquot samples of twenty-nine Antarctic L and H chondrites were analyzed for their nuclear track records and 53 Mn activities. Track density in the analyzed samples range from 10 4 to ~ 6×10 6 cm -2 . An important finding is the observation of track-rich grains in a set of four L3 chondrites ALHA 77215, 77216, 77217 and 77252, suspected to belong to the same fall based on petrographic observations. An additional sample, ALHA 78105, a L6 chondrite, also contains track-rich grains. 53 Mn activity is at near saturation level in ~65% of the analyzed samples indicating exposure ages > 10 m.y. in these cases. Very few H chondrites from the 7-m.y. exposure age peak are apparently sampled among the ones analyzed in this study. About 6% and 4% respectively of the Antarctic H and L chondrites, analyzed so far for their cosmogenic records, have precompaction irradiation features. Combined analysis of 53 Mn and nuclear track data allowed us to confirm or rule out the proposed pairing of several sets of Antarctic meteorites, and also to estimate the preatmospheric sizes of some of these meteorites. The results indicate that most of the small Antarctic meteorites (< 1 kg) have suffered high (> 95%) ablation mass-loss. |
format |
Article in Journal/Newspaper |
author |
Goswami, J. N. Nishiizumi, K. |
spellingShingle |
Goswami, J. N. Nishiizumi, K. Cosmogenic records in Antarctic meteorites |
author_facet |
Goswami, J. N. Nishiizumi, K. |
author_sort |
Goswami, J. N. |
title |
Cosmogenic records in Antarctic meteorites |
title_short |
Cosmogenic records in Antarctic meteorites |
title_full |
Cosmogenic records in Antarctic meteorites |
title_fullStr |
Cosmogenic records in Antarctic meteorites |
title_full_unstemmed |
Cosmogenic records in Antarctic meteorites |
title_sort |
cosmogenic records in antarctic meteorites |
publisher |
Elsevier Science |
publishDate |
1983 |
url |
http://repository.ias.ac.in/14664/ http://linkinghub.elsevier.com/retrieve/pii/0012821X8390047X |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Goswami, J. N. Nishiizumi, K. (1983) Cosmogenic records in Antarctic meteorites Earth and Planetary Science Letters, 64 (1). pp. 1-8. ISSN 0012-821X |
_version_ |
1766241847595761664 |