Stardust in Antarctic micrometeorites
We report the discovery of presolar silicate, oxide (hibonite), and (possibly) SiC grains in four Antarctic micrometeorites (AMMs). The oxygen isotopic compositions of the eighteen presolar silicate (and one oxide) grains found are similar those observed previously in primitive meteorites and interp...
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2008
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/15620 2023-05-15T13:42:28+02:00 Stardust in Antarctic micrometeorites YADA, Toru FLOSS, Christine STADERMANN, Frank J. ZINNER, Ernst NAKAMURA, Tomoki NOGUCHI, Takaaki LEA, A. Scott 2008-01-01 application/pdf https://journals.uair.arizona.edu/index.php/maps/article/view/15620 eng eng Meteoritics & Planetary Science Archives https://journals.uair.arizona.edu/index.php/maps/article/view/15620/15608 https://journals.uair.arizona.edu/index.php/maps/article/view/15620 Meteoritics & Planetary Science Archives; Vol 43, No 8 (2008); 1287-1298 1945-5100 1086-9379 Presolar grains;Micrometeorites;Oxygen isotopes info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2008 ftunivarizonaojs 2020-11-14T17:53:01Z We report the discovery of presolar silicate, oxide (hibonite), and (possibly) SiC grains in four Antarctic micrometeorites (AMMs). The oxygen isotopic compositions of the eighteen presolar silicate (and one oxide) grains found are similar those observed previously in primitive meteorites and interplanetary dust particles, and indicate origins in oxygen-rich red giant or asymptotic giant branch stars, or in supernovae. Four grains with anomalous C isotopic compositions were also detected. 12C/13C as well as Si ratios are similar to those of mainstream SiC grains; the N isotopic composition of one grain is also consistent with a mainstream SiC classification. Presolar silicate grains were found in three of the seven AMMs studied, and are heterogeneously distributed within these micrometeorites. Fourteen of the 18 presolar silicate grains and 3 of the 4 C-anomalous grains were found within one AMM, T98G8. Presolar silicate-bearing micrometeorites contain crystalline silicates that give sharp X-ray diffractions and do not contain magnesiowstite, which forms mainly through the decomposition of phyllosilicates and carbonates. The occurrence of this mineral in AMMs without presolar silicates suggests that secondary parent body processes probably determine the presence or absence of presolar silicates in Antarctic micrometeorites. Article in Journal/Newspaper Antarc* Antarctic Journals at the University of Arizona Antarctic |
institution |
Open Polar |
collection |
Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
Presolar grains;Micrometeorites;Oxygen isotopes |
spellingShingle |
Presolar grains;Micrometeorites;Oxygen isotopes YADA, Toru FLOSS, Christine STADERMANN, Frank J. ZINNER, Ernst NAKAMURA, Tomoki NOGUCHI, Takaaki LEA, A. Scott Stardust in Antarctic micrometeorites |
topic_facet |
Presolar grains;Micrometeorites;Oxygen isotopes |
description |
We report the discovery of presolar silicate, oxide (hibonite), and (possibly) SiC grains in four Antarctic micrometeorites (AMMs). The oxygen isotopic compositions of the eighteen presolar silicate (and one oxide) grains found are similar those observed previously in primitive meteorites and interplanetary dust particles, and indicate origins in oxygen-rich red giant or asymptotic giant branch stars, or in supernovae. Four grains with anomalous C isotopic compositions were also detected. 12C/13C as well as Si ratios are similar to those of mainstream SiC grains; the N isotopic composition of one grain is also consistent with a mainstream SiC classification. Presolar silicate grains were found in three of the seven AMMs studied, and are heterogeneously distributed within these micrometeorites. Fourteen of the 18 presolar silicate grains and 3 of the 4 C-anomalous grains were found within one AMM, T98G8. Presolar silicate-bearing micrometeorites contain crystalline silicates that give sharp X-ray diffractions and do not contain magnesiowstite, which forms mainly through the decomposition of phyllosilicates and carbonates. The occurrence of this mineral in AMMs without presolar silicates suggests that secondary parent body processes probably determine the presence or absence of presolar silicates in Antarctic micrometeorites. |
format |
Article in Journal/Newspaper |
author |
YADA, Toru FLOSS, Christine STADERMANN, Frank J. ZINNER, Ernst NAKAMURA, Tomoki NOGUCHI, Takaaki LEA, A. Scott |
author_facet |
YADA, Toru FLOSS, Christine STADERMANN, Frank J. ZINNER, Ernst NAKAMURA, Tomoki NOGUCHI, Takaaki LEA, A. Scott |
author_sort |
YADA, Toru |
title |
Stardust in Antarctic micrometeorites |
title_short |
Stardust in Antarctic micrometeorites |
title_full |
Stardust in Antarctic micrometeorites |
title_fullStr |
Stardust in Antarctic micrometeorites |
title_full_unstemmed |
Stardust in Antarctic micrometeorites |
title_sort |
stardust in antarctic micrometeorites |
publisher |
Meteoritics & Planetary Science Archives |
publishDate |
2008 |
url |
https://journals.uair.arizona.edu/index.php/maps/article/view/15620 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Meteoritics & Planetary Science Archives; Vol 43, No 8 (2008); 1287-1298 1945-5100 1086-9379 |
op_relation |
https://journals.uair.arizona.edu/index.php/maps/article/view/15620/15608 https://journals.uair.arizona.edu/index.php/maps/article/view/15620 |
_version_ |
1766168274932858880 |