Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources
Abstract— Depending on their velocity, entry angle and mass, extraterrestrial dust particles suffer certain degrees of heating during entry into Earth's atmosphere, and the mineralogy and chemical composition of these dust particles are significantly changed. In the present study, pulse‐heating...
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crwiley:10.1111/j.1945-5100.1998.tb01632.x 2024-09-09T19:08:32+00:00 Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources GRESHAKE, ANSGAR KLÖCK, WOLFGANG ARNDT, PETER MAETZ, MISCHA FLYNN, GEORGE J. BAJT, SASA BISCHOFF, ADDI 1998 http://dx.doi.org/10.1111/j.1945-5100.1998.tb01632.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01632.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01632.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Meteoritics & Planetary Science volume 33, issue 2, page 267-290 ISSN 1086-9379 1945-5100 journal-article 1998 crwiley https://doi.org/10.1111/j.1945-5100.1998.tb01632.x 2024-06-20T04:22:55Z Abstract— Depending on their velocity, entry angle and mass, extraterrestrial dust particles suffer certain degrees of heating during entry into Earth's atmosphere, and the mineralogy and chemical composition of these dust particles are significantly changed. In the present study, pulse‐heating experiments simulating the atmospheric entry heating of micrometeoroids were carried out in order to understand the mineralogical and chemical changes quantitatively as well as to estimate the peak temperature experienced by the particles during entry heating. Fragments of the CI chondrites Orgueil and Alais as well as pyrrhotites from Orgueil were used as analogue material. The experiments show that the volatile elements S, Zn, Ga, Ge, and Se can be lost from 50 to 100 μm sized CI meteorite fragments at temperatures and heating times applicable to the entry heating of similar sized cosmic dust particles. It is concluded that depletions of these elements relative to CI as observed in micrometeorites are mainly caused by atmospheric entry heating. Besides explaining the element abundances in micrometeorites, the experimentally obtained release patterns can also be used as indicators to estimate the peak heating of dust particles during entry. Using the abundances of Zn and Ge and assuming their original concentrations close to CI, a maximum heating of 1100–1200 °C is obtained for previously analyzed Antarctic micrometeroites. Thermal alteration also strongly influenced the mineralogy of the meteorite fragments. While the unheated samples mainly consisted of phyllosilicates, these phases almost completely transformed into olivine and pyroxene in the fragments heated to ≥800 °C. Therefore, dust particles that still contain hydrous minerals were probably never heated to temperatures ≥800 °C in the atmosphere. During continued heating, the grain size of the newly formed silicates increased and the composition of the olivines equilibrated. Applying these results quantitatively to Antarctic micrometeorites, typical peak ... Article in Journal/Newspaper Antarc* Antarctic Wiley Online Library Antarctic Meteoritics & Planetary Science 33 2 267 290 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract— Depending on their velocity, entry angle and mass, extraterrestrial dust particles suffer certain degrees of heating during entry into Earth's atmosphere, and the mineralogy and chemical composition of these dust particles are significantly changed. In the present study, pulse‐heating experiments simulating the atmospheric entry heating of micrometeoroids were carried out in order to understand the mineralogical and chemical changes quantitatively as well as to estimate the peak temperature experienced by the particles during entry heating. Fragments of the CI chondrites Orgueil and Alais as well as pyrrhotites from Orgueil were used as analogue material. The experiments show that the volatile elements S, Zn, Ga, Ge, and Se can be lost from 50 to 100 μm sized CI meteorite fragments at temperatures and heating times applicable to the entry heating of similar sized cosmic dust particles. It is concluded that depletions of these elements relative to CI as observed in micrometeorites are mainly caused by atmospheric entry heating. Besides explaining the element abundances in micrometeorites, the experimentally obtained release patterns can also be used as indicators to estimate the peak heating of dust particles during entry. Using the abundances of Zn and Ge and assuming their original concentrations close to CI, a maximum heating of 1100–1200 °C is obtained for previously analyzed Antarctic micrometeroites. Thermal alteration also strongly influenced the mineralogy of the meteorite fragments. While the unheated samples mainly consisted of phyllosilicates, these phases almost completely transformed into olivine and pyroxene in the fragments heated to ≥800 °C. Therefore, dust particles that still contain hydrous minerals were probably never heated to temperatures ≥800 °C in the atmosphere. During continued heating, the grain size of the newly formed silicates increased and the composition of the olivines equilibrated. Applying these results quantitatively to Antarctic micrometeorites, typical peak ... |
format |
Article in Journal/Newspaper |
author |
GRESHAKE, ANSGAR KLÖCK, WOLFGANG ARNDT, PETER MAETZ, MISCHA FLYNN, GEORGE J. BAJT, SASA BISCHOFF, ADDI |
spellingShingle |
GRESHAKE, ANSGAR KLÖCK, WOLFGANG ARNDT, PETER MAETZ, MISCHA FLYNN, GEORGE J. BAJT, SASA BISCHOFF, ADDI Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
author_facet |
GRESHAKE, ANSGAR KLÖCK, WOLFGANG ARNDT, PETER MAETZ, MISCHA FLYNN, GEORGE J. BAJT, SASA BISCHOFF, ADDI |
author_sort |
GRESHAKE, ANSGAR |
title |
Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
title_short |
Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
title_full |
Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
title_fullStr |
Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
title_full_unstemmed |
Heating experiments simulating atmospheric entry heating of micrometeorites: Clues to their parent body sources |
title_sort |
heating experiments simulating atmospheric entry heating of micrometeorites: clues to their parent body sources |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1111/j.1945-5100.1998.tb01632.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1945-5100.1998.tb01632.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1945-5100.1998.tb01632.x |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Meteoritics & Planetary Science volume 33, issue 2, page 267-290 ISSN 1086-9379 1945-5100 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1945-5100.1998.tb01632.x |
container_title |
Meteoritics & Planetary Science |
container_volume |
33 |
container_issue |
2 |
container_start_page |
267 |
op_container_end_page |
290 |
_version_ |
1809822772862386176 |