The thermometry of enstatite chondrites: A brief review and update
Abstract— Due to the discoveries in Antarctica, the number of known enstatite chondrites has doubled in the last few years, and many rare or previously unknown types have been collected, most notably many EL3 and EH3 chondrites. We have applied the five major enstatite chondrite thermometers to the...
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crwiley:10.1111/j.1945-5100.1996.tb02038.x 2024-06-23T07:47:59+00:00 The thermometry of enstatite chondrites: A brief review and update ZHANG, Yanhong SEARS, Derek W. G. 1996 http://dx.doi.org/10.1111/j.1945-5100.1996.tb02038.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1996.tb02038.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1996.tb02038.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 31, issue 5, page 647-655 ISSN 1086-9379 1945-5100 journal-article 1996 crwiley https://doi.org/10.1111/j.1945-5100.1996.tb02038.x 2024-06-11T04:51:11Z Abstract— Due to the discoveries in Antarctica, the number of known enstatite chondrites has doubled in the last few years, and many rare or previously unknown types have been collected, most notably many EL3 and EH3 chondrites. We have applied the five major enstatite chondrite thermometers to the new and previously known enstatite chondrites, the thermometers being: (1) kamacite‐quartz‐enstatite‐oldhamite‐troilite (KQEOT), (2) oldhamite, (3) alabandite‐niningerite, (4) sphalerite, and (5) phosphide‐metal. Measured temperatures based on the KQEOT and oldhamite systems are 800 °C‐1000 °C with the type 3 enstatite chondrites having values similar to those of type 4–6. It seems likely that these temperatures relate to events prior to parent body metamorphism, such as nebula condensation or chondrule formation, and were not significantly reset by later events. Measured temperatures for alabandite‐niningerite, metal‐phosphide and sphalerite in EH chondrites increase from 300 °C‐400 °C to 600 °C‐800 °C with petrographic indications of increasing metamorphism. In contrast, measured temperatures for all EL chondrites, including the most heavily metamorphosed, are generally <400 °C. Apparently EL chondrites cooled more slowly than the EH chondrites regardless of metamorphism experienced. Measured temperatures for the alabandite‐niningerite, metal‐phosphide and sphalerite are actually closure temperatures for the last thermal event suffered by the meteorite, and the fast cooling rates indicated are most consistent with processes occurring in thick regoliths. Article in Journal/Newspaper Antarc* Antarctica Wiley Online Library Meteoritics & Planetary Science 31 5 647 655 |
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English |
description |
Abstract— Due to the discoveries in Antarctica, the number of known enstatite chondrites has doubled in the last few years, and many rare or previously unknown types have been collected, most notably many EL3 and EH3 chondrites. We have applied the five major enstatite chondrite thermometers to the new and previously known enstatite chondrites, the thermometers being: (1) kamacite‐quartz‐enstatite‐oldhamite‐troilite (KQEOT), (2) oldhamite, (3) alabandite‐niningerite, (4) sphalerite, and (5) phosphide‐metal. Measured temperatures based on the KQEOT and oldhamite systems are 800 °C‐1000 °C with the type 3 enstatite chondrites having values similar to those of type 4–6. It seems likely that these temperatures relate to events prior to parent body metamorphism, such as nebula condensation or chondrule formation, and were not significantly reset by later events. Measured temperatures for alabandite‐niningerite, metal‐phosphide and sphalerite in EH chondrites increase from 300 °C‐400 °C to 600 °C‐800 °C with petrographic indications of increasing metamorphism. In contrast, measured temperatures for all EL chondrites, including the most heavily metamorphosed, are generally <400 °C. Apparently EL chondrites cooled more slowly than the EH chondrites regardless of metamorphism experienced. Measured temperatures for the alabandite‐niningerite, metal‐phosphide and sphalerite are actually closure temperatures for the last thermal event suffered by the meteorite, and the fast cooling rates indicated are most consistent with processes occurring in thick regoliths. |
format |
Article in Journal/Newspaper |
author |
ZHANG, Yanhong SEARS, Derek W. G. |
spellingShingle |
ZHANG, Yanhong SEARS, Derek W. G. The thermometry of enstatite chondrites: A brief review and update |
author_facet |
ZHANG, Yanhong SEARS, Derek W. G. |
author_sort |
ZHANG, Yanhong |
title |
The thermometry of enstatite chondrites: A brief review and update |
title_short |
The thermometry of enstatite chondrites: A brief review and update |
title_full |
The thermometry of enstatite chondrites: A brief review and update |
title_fullStr |
The thermometry of enstatite chondrites: A brief review and update |
title_full_unstemmed |
The thermometry of enstatite chondrites: A brief review and update |
title_sort |
thermometry of enstatite chondrites: a brief review and update |
publisher |
Wiley |
publishDate |
1996 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1996.tb02038.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1996.tb02038.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1996.tb02038.x |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Meteoritics & Planetary Science volume 31, issue 5, page 647-655 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1996.tb02038.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
31 |
container_issue |
5 |
container_start_page |
647 |
op_container_end_page |
655 |
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1802638311593869312 |