The entry heating and abundances of basaltic micrometeorites
Abstract Basaltic micrometeorites (MMs) derived from HED‐like parent bodies have been found among particles collected from the Antarctic and from Arctic glaciers and are to date the only achondritic particles reported among cosmic dust. The majority of Antarctic basaltic particles are completely mel...
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crwiley:10.1111/maps.12830 2024-06-09T07:40:51+00:00 The entry heating and abundances of basaltic micrometeorites Genge, Matthew J. Science and Technology Facilities Council 2017 http://dx.doi.org/10.1111/maps.12830 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12830 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12830 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Meteoritics & Planetary Science volume 52, issue 5, page 1000-1013 ISSN 1086-9379 1945-5100 journal-article 2017 crwiley https://doi.org/10.1111/maps.12830 2024-05-16T14:20:20Z Abstract Basaltic micrometeorites (MMs) derived from HED‐like parent bodies have been found among particles collected from the Antarctic and from Arctic glaciers and are to date the only achondritic particles reported among cosmic dust. The majority of Antarctic basaltic particles are completely melted cosmic spherules with only one unmelted particle recognized from the region. This paper investigates the entry heating of basaltic MMs in order to predict the relative abundances of unmelted to melted basaltic particles and to evaluate how mineralogical differences in precursor materials influence the final products of atmospheric entry collected on the Earth's surface. Thermodynamic modeling is used to simulate the melting behavior of particles with compositions corresponding to eucrites, diogenites, and ordinary chondrites in order to evaluate degree of partial melting and to make a comparison between the behavior of chondritic particles that dominate the terrestrial dust flux and basaltic micrometeroids. The results of 120,000 simulations were compiled to predict relative abundances and indicate that the phase relations of precursor materials are crucial in determining the relative abundances of particle types. Diogenite and ordinary chondrite materials exhibit similar behavior, although diogenite precursors are more likely to form cosmic spherules under similar entry parameters. Eucrite particles, however, are much more likely to melt due to their lower liquidus temperatures and small temperature interval of partial melting. Eucrite MMs, therefore, usually form completely molten cosmic spherules except at particle diameters <100 μm. The low abundance of unmelted basaltic MMs compared with spherules, if statistically valid, is also shown to be inconsistent with a low velocity population (12 km s −1 ) and is more compatible with higher velocities which may suggest a near‐Earth asteroid source dominates the current dust production of basaltic MMs. Article in Journal/Newspaper Antarc* Antarctic Arctic Wiley Online Library Antarctic Arctic The Antarctic Meteoritics & Planetary Science 52 5 1000 1013 |
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Abstract Basaltic micrometeorites (MMs) derived from HED‐like parent bodies have been found among particles collected from the Antarctic and from Arctic glaciers and are to date the only achondritic particles reported among cosmic dust. The majority of Antarctic basaltic particles are completely melted cosmic spherules with only one unmelted particle recognized from the region. This paper investigates the entry heating of basaltic MMs in order to predict the relative abundances of unmelted to melted basaltic particles and to evaluate how mineralogical differences in precursor materials influence the final products of atmospheric entry collected on the Earth's surface. Thermodynamic modeling is used to simulate the melting behavior of particles with compositions corresponding to eucrites, diogenites, and ordinary chondrites in order to evaluate degree of partial melting and to make a comparison between the behavior of chondritic particles that dominate the terrestrial dust flux and basaltic micrometeroids. The results of 120,000 simulations were compiled to predict relative abundances and indicate that the phase relations of precursor materials are crucial in determining the relative abundances of particle types. Diogenite and ordinary chondrite materials exhibit similar behavior, although diogenite precursors are more likely to form cosmic spherules under similar entry parameters. Eucrite particles, however, are much more likely to melt due to their lower liquidus temperatures and small temperature interval of partial melting. Eucrite MMs, therefore, usually form completely molten cosmic spherules except at particle diameters <100 μm. The low abundance of unmelted basaltic MMs compared with spherules, if statistically valid, is also shown to be inconsistent with a low velocity population (12 km s −1 ) and is more compatible with higher velocities which may suggest a near‐Earth asteroid source dominates the current dust production of basaltic MMs. |
author2 |
Science and Technology Facilities Council |
format |
Article in Journal/Newspaper |
author |
Genge, Matthew J. |
spellingShingle |
Genge, Matthew J. The entry heating and abundances of basaltic micrometeorites |
author_facet |
Genge, Matthew J. |
author_sort |
Genge, Matthew J. |
title |
The entry heating and abundances of basaltic micrometeorites |
title_short |
The entry heating and abundances of basaltic micrometeorites |
title_full |
The entry heating and abundances of basaltic micrometeorites |
title_fullStr |
The entry heating and abundances of basaltic micrometeorites |
title_full_unstemmed |
The entry heating and abundances of basaltic micrometeorites |
title_sort |
entry heating and abundances of basaltic micrometeorites |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1111/maps.12830 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmaps.12830 https://onlinelibrary.wiley.com/doi/pdf/10.1111/maps.12830 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
Meteoritics & Planetary Science volume 52, issue 5, page 1000-1013 ISSN 1086-9379 1945-5100 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/maps.12830 |
container_title |
Meteoritics & Planetary Science |
container_volume |
52 |
container_issue |
5 |
container_start_page |
1000 |
op_container_end_page |
1013 |
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1801369254250938368 |