Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection
The Kwajalein micrometeorite collection utilised high volume air samplers fitted with 5 micrometer laser-etched polycarbonate membrane filters to capture particles directly from the atmosphere. The filters were changed weekly over several months throughout 2011/12, providing the opportunity to inves...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20150010413 2023-05-15T13:33:56+02:00 Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection Ishii, H. A. Russell, S. S. Zolensky, M. E. Brownlee, D. E. Bradley, J. P. Price, M. C. Wozniakiewicz, P. J. Unclassified, Unlimited, Publicly available August 16, 2015 application/pdf http://hdl.handle.net/2060/20150010413 unknown Document ID: 20150010413 http://hdl.handle.net/2060/20150010413 Copyright, Distribution as joint owner in the copyright CASI Lunar and Planetary Science and Exploration JSC-CN-33258 2015 Goldschmidt Conference; 16-21 Aug. 2015; Prague; Czechoslovakia 2015 ftnasantrs 2019-07-21T00:07:33Z The Kwajalein micrometeorite collection utilised high volume air samplers fitted with 5 micrometer laser-etched polycarbonate membrane filters to capture particles directly from the atmosphere. The filters were changed weekly over several months throughout 2011/12, providing the opportunity to investigate the contemporary flux of micrometeorites. We recently reported the results of our initial survey of cosmic spherule-like particles on several of these filters. We identified three main groups of particle based on bulk compositions: 1. Silicate spherules rich in Mg, Ca and Fe, 2. Silicate spherules rich in Al, Ca, K and/or Na and 3. Fe-rich spherules. Abundances appeared to change over time suggesting links with celestial activity (e.g. meteor showers), however, spherules similar to groups 2 and 3 can be produced by terrestrial and anthropogenic activity (e.g. volcanic microspherules exhibit similar compositions to group 2 spherules and metallic spherules similar to those of group 3 can be formed during fuel combustion). We are now studying the internal structures and chemistries of these spherules and comparing against cosmic spherules identified in other collections to confrim their origins and further contrain the contemporary micrometeorite flux. Particles are being picked, embedded in resin and polished through to reveal their interiors. Here we will describe our ongoing analyses of these particles via SEM. We will also introduce our new collection using this method that is currently being performed in the Antarctic. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
topic |
Lunar and Planetary Science and Exploration |
spellingShingle |
Lunar and Planetary Science and Exploration Ishii, H. A. Russell, S. S. Zolensky, M. E. Brownlee, D. E. Bradley, J. P. Price, M. C. Wozniakiewicz, P. J. Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
topic_facet |
Lunar and Planetary Science and Exploration |
description |
The Kwajalein micrometeorite collection utilised high volume air samplers fitted with 5 micrometer laser-etched polycarbonate membrane filters to capture particles directly from the atmosphere. The filters were changed weekly over several months throughout 2011/12, providing the opportunity to investigate the contemporary flux of micrometeorites. We recently reported the results of our initial survey of cosmic spherule-like particles on several of these filters. We identified three main groups of particle based on bulk compositions: 1. Silicate spherules rich in Mg, Ca and Fe, 2. Silicate spherules rich in Al, Ca, K and/or Na and 3. Fe-rich spherules. Abundances appeared to change over time suggesting links with celestial activity (e.g. meteor showers), however, spherules similar to groups 2 and 3 can be produced by terrestrial and anthropogenic activity (e.g. volcanic microspherules exhibit similar compositions to group 2 spherules and metallic spherules similar to those of group 3 can be formed during fuel combustion). We are now studying the internal structures and chemistries of these spherules and comparing against cosmic spherules identified in other collections to confrim their origins and further contrain the contemporary micrometeorite flux. Particles are being picked, embedded in resin and polished through to reveal their interiors. Here we will describe our ongoing analyses of these particles via SEM. We will also introduce our new collection using this method that is currently being performed in the Antarctic. |
format |
Other/Unknown Material |
author |
Ishii, H. A. Russell, S. S. Zolensky, M. E. Brownlee, D. E. Bradley, J. P. Price, M. C. Wozniakiewicz, P. J. |
author_facet |
Ishii, H. A. Russell, S. S. Zolensky, M. E. Brownlee, D. E. Bradley, J. P. Price, M. C. Wozniakiewicz, P. J. |
author_sort |
Ishii, H. A. |
title |
Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
title_short |
Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
title_full |
Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
title_fullStr |
Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
title_full_unstemmed |
Analysis of Cosmic Spherule Candidates from the Kwajalein Micrometeorite Collection |
title_sort |
analysis of cosmic spherule candidates from the kwajalein micrometeorite collection |
publishDate |
2015 |
url |
http://hdl.handle.net/2060/20150010413 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 20150010413 http://hdl.handle.net/2060/20150010413 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766047163645689856 |