Hydrogen isotopic composition of water from fossil micrometeorites in howardites
We have measured the hydrogen isotopic composition (D/H ratios) of the water from 13 carbonaceous chondritic microclasts (CCMs, size <1 mm) trapped in two howardites (Kapoeta and Yamato-793497) early in the evolution of Solar System. The division into tochilinite-rich; magnetite-rich, olivine-poo...
Published in: | Geochimica et Cosmochimica Acta |
---|---|
Main Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2005
|
Subjects: | |
Online Access: | https://oro.open.ac.uk/18195/ https://doi.org/10.1016/j.gca.2004.12.021 |
id |
ftopenunivgb:oai:oro.open.ac.uk:18195 |
---|---|
record_format |
openpolar |
spelling |
ftopenunivgb:oai:oro.open.ac.uk:18195 2023-06-11T04:04:24+02:00 Hydrogen isotopic composition of water from fossil micrometeorites in howardites Gounelle, Matthieu Engrand, Cécile Alard, Olivier Bland, Philip A. Zolensky, Michael E. Russell, Sara S. Duprat, Jean 2005-07-01 https://oro.open.ac.uk/18195/ https://doi.org/10.1016/j.gca.2004.12.021 unknown Gounelle, Matthieu; Engrand, Cécile; Alard, Olivier <http://oro.open.ac.uk/view/person/oa78.html>; Bland, Philip A.; Zolensky, Michael E.; Russell, Sara S. and Duprat, Jean (2005). Hydrogen isotopic composition of water from fossil micrometeorites in howardites. Geochimica et Cosmochimica Acta, 69(13) pp. 3431–3443. Journal Item None PeerReviewed 2005 ftopenunivgb https://doi.org/10.1016/j.gca.2004.12.021 2023-05-28T05:42:08Z We have measured the hydrogen isotopic composition (D/H ratios) of the water from 13 carbonaceous chondritic microclasts (CCMs, size <1 mm) trapped in two howardites (Kapoeta and Yamato-793497) early in the evolution of Solar System. The division into tochilinite-rich; magnetite-rich, olivine-poor; magnetite-rich, olivine-rich CCM types is corroborated by the hydrogen isotopic compositions. Both mineralogy and hydrogen isotopic compositions demonstrate that tochilinite-rich CCMs represent CM2 chondritic matter. In contrast, there is no good match between the isotopic and mineralogical properties of the magnetite-rich CCMs and the known groups of carbonaceous chondrites, suggesting that magnetite-rich CCMs represent a new kind of chondritic matter, not yet sampled in meteorite collections. This demonstrates that the view of the asteroid belt revealed by the collection of meteorites is incomplete. The study of (micro)clasts offers a unique opportunity to better decipher the nature and relative abundance of asteroids. The average hydrogen isotopic composition of water belonging to CCMs, D/H = (152.0 +/- 4.8) X 10(-6) (1 sigma(m)), is similar to that of Antarctic micrometeorites (AMMs), D/H = (161.2 +/- 3.8) X 10(-6) (1 sigma(m)). The similarity, in terms of mineralogy and hydrogen isotopic composition, between CCMs and AMMs demonstrates that the composition of the micrometeorites has not been modified over the whole history of the Solar System. It indicates that the composition of the micrometeorite flux onto Earth has been, and is, dominated by a mixture of CM2-like; magnetite-rich, olivine-poor; magnetite-rich, olivine-rich carbonaceous chondritic matter exemplified by CCMs found in howardites. Because CCMs have not suffered atmospheric entry, they provide an abundant source of pristine micrometeorites. The average D/H ratio of the whole population of CCMs is identical within errors to that of the Earth (149 +/- 3 X 10(-6)). The match between the CCMs D/H ratio and that of the Earth is especially remarkable ... Article in Journal/Newspaper Antarc* Antarctic The Open University: Open Research Online (ORO) Antarctic Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) Geochimica et Cosmochimica Acta 69 13 3431 3443 |
institution |
Open Polar |
collection |
The Open University: Open Research Online (ORO) |
op_collection_id |
ftopenunivgb |
language |
unknown |
description |
We have measured the hydrogen isotopic composition (D/H ratios) of the water from 13 carbonaceous chondritic microclasts (CCMs, size <1 mm) trapped in two howardites (Kapoeta and Yamato-793497) early in the evolution of Solar System. The division into tochilinite-rich; magnetite-rich, olivine-poor; magnetite-rich, olivine-rich CCM types is corroborated by the hydrogen isotopic compositions. Both mineralogy and hydrogen isotopic compositions demonstrate that tochilinite-rich CCMs represent CM2 chondritic matter. In contrast, there is no good match between the isotopic and mineralogical properties of the magnetite-rich CCMs and the known groups of carbonaceous chondrites, suggesting that magnetite-rich CCMs represent a new kind of chondritic matter, not yet sampled in meteorite collections. This demonstrates that the view of the asteroid belt revealed by the collection of meteorites is incomplete. The study of (micro)clasts offers a unique opportunity to better decipher the nature and relative abundance of asteroids. The average hydrogen isotopic composition of water belonging to CCMs, D/H = (152.0 +/- 4.8) X 10(-6) (1 sigma(m)), is similar to that of Antarctic micrometeorites (AMMs), D/H = (161.2 +/- 3.8) X 10(-6) (1 sigma(m)). The similarity, in terms of mineralogy and hydrogen isotopic composition, between CCMs and AMMs demonstrates that the composition of the micrometeorites has not been modified over the whole history of the Solar System. It indicates that the composition of the micrometeorite flux onto Earth has been, and is, dominated by a mixture of CM2-like; magnetite-rich, olivine-poor; magnetite-rich, olivine-rich carbonaceous chondritic matter exemplified by CCMs found in howardites. Because CCMs have not suffered atmospheric entry, they provide an abundant source of pristine micrometeorites. The average D/H ratio of the whole population of CCMs is identical within errors to that of the Earth (149 +/- 3 X 10(-6)). The match between the CCMs D/H ratio and that of the Earth is especially remarkable ... |
format |
Article in Journal/Newspaper |
author |
Gounelle, Matthieu Engrand, Cécile Alard, Olivier Bland, Philip A. Zolensky, Michael E. Russell, Sara S. Duprat, Jean |
spellingShingle |
Gounelle, Matthieu Engrand, Cécile Alard, Olivier Bland, Philip A. Zolensky, Michael E. Russell, Sara S. Duprat, Jean Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
author_facet |
Gounelle, Matthieu Engrand, Cécile Alard, Olivier Bland, Philip A. Zolensky, Michael E. Russell, Sara S. Duprat, Jean |
author_sort |
Gounelle, Matthieu |
title |
Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
title_short |
Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
title_full |
Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
title_fullStr |
Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
title_full_unstemmed |
Hydrogen isotopic composition of water from fossil micrometeorites in howardites |
title_sort |
hydrogen isotopic composition of water from fossil micrometeorites in howardites |
publishDate |
2005 |
url |
https://oro.open.ac.uk/18195/ https://doi.org/10.1016/j.gca.2004.12.021 |
long_lat |
ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Antarctic Yamato |
geographic_facet |
Antarctic Yamato |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Gounelle, Matthieu; Engrand, Cécile; Alard, Olivier <http://oro.open.ac.uk/view/person/oa78.html>; Bland, Philip A.; Zolensky, Michael E.; Russell, Sara S. and Duprat, Jean (2005). Hydrogen isotopic composition of water from fossil micrometeorites in howardites. Geochimica et Cosmochimica Acta, 69(13) pp. 3431–3443. |
op_doi |
https://doi.org/10.1016/j.gca.2004.12.021 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
69 |
container_issue |
13 |
container_start_page |
3431 |
op_container_end_page |
3443 |
_version_ |
1768387626802348032 |