The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation
Weathering of meteorites includes a variety of chemical and mineralogical changes, including conversion of metal to iron oxides, or rust. Other changes include the devitrification of glass, especially in fusion crust. On a longer time scale, major minerals such as olivine, pyroxene, and feldspar are...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19980107900 2023-05-15T13:42:49+02:00 The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation Bland, P. A. Benoit, P. H. Sears, D. W. G. Akridge, J. M. C. Unclassified, Unlimited, Publicly available 1995 application/pdf http://hdl.handle.net/2060/19980107900 unknown Document ID: 19980107900 http://hdl.handle.net/2060/19980107900 No Copyright CASI Astrophysics NASA/CR-97-207749 NAS 1.26:207749 1995 ftnasantrs 2019-08-31T23:03:41Z Weathering of meteorites includes a variety of chemical and mineralogical changes, including conversion of metal to iron oxides, or rust. Other changes include the devitrification of glass, especially in fusion crust. On a longer time scale, major minerals such as olivine, pyroxene, and feldspar are partially or wholly converted to various phyllosilicates. The degree of weathering of meteorite finds is often noted using a qualitative system based on visual inspection of hand specimens. Several quantitative weathering classification systems have been proposed or are currently under development. Wlotzka has proposed a classification system based on mineralogical changes observed in polished sections and Mossbauer properties of meteorite powders have also been used. In the current paper, we discuss induced thermoluminescence (TL) as an indicator of degree of weathering of individual meteorites. The quantitative measures of weathering, including induced TL, suffer from one major flaw, namely that their results only apply to small portions of the meteorite. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Astrophysics |
spellingShingle |
Astrophysics Bland, P. A. Benoit, P. H. Sears, D. W. G. Akridge, J. M. C. The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
topic_facet |
Astrophysics |
description |
Weathering of meteorites includes a variety of chemical and mineralogical changes, including conversion of metal to iron oxides, or rust. Other changes include the devitrification of glass, especially in fusion crust. On a longer time scale, major minerals such as olivine, pyroxene, and feldspar are partially or wholly converted to various phyllosilicates. The degree of weathering of meteorite finds is often noted using a qualitative system based on visual inspection of hand specimens. Several quantitative weathering classification systems have been proposed or are currently under development. Wlotzka has proposed a classification system based on mineralogical changes observed in polished sections and Mossbauer properties of meteorite powders have also been used. In the current paper, we discuss induced thermoluminescence (TL) as an indicator of degree of weathering of individual meteorites. The quantitative measures of weathering, including induced TL, suffer from one major flaw, namely that their results only apply to small portions of the meteorite. |
format |
Other/Unknown Material |
author |
Bland, P. A. Benoit, P. H. Sears, D. W. G. Akridge, J. M. C. |
author_facet |
Bland, P. A. Benoit, P. H. Sears, D. W. G. Akridge, J. M. C. |
author_sort |
Bland, P. A. |
title |
The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
title_short |
The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
title_full |
The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
title_fullStr |
The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
title_full_unstemmed |
The Weathering of Antarctic Meteorites: Climatic Controls on Weathering Rates and Implications for Meteorite Accumulation |
title_sort |
weathering of antarctic meteorites: climatic controls on weathering rates and implications for meteorite accumulation |
publishDate |
1995 |
url |
http://hdl.handle.net/2060/19980107900 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 19980107900 http://hdl.handle.net/2060/19980107900 |
op_rights |
No Copyright |
_version_ |
1766173115725905920 |