Lithium isotopes as indicators of meteorite parent body alteration
Hydrothermal processing on planetesimals in the early solar system produced new mineral phases, including those generated by the transformation of anhydrous silicates into their hydrated counterparts. Carbonaceous chondrites represent tangible remnants of such alteration products. Lithium isotopes a...
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Online Access: | https://oro.open.ac.uk/36968/ https://doi.org/10.1111/maps.12094 |
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ftopenunivgb:oai:oro.open.ac.uk:36968 2023-06-11T04:17:13+02:00 Lithium isotopes as indicators of meteorite parent body alteration Sephton, Mark James, Rachael H. Fehr, Manuela Bland, Philip Gounelle, Matthieu 2013-05 https://oro.open.ac.uk/36968/ https://doi.org/10.1111/maps.12094 unknown Sephton, Mark <http://oro.open.ac.uk/view/person/mas23.html>; James, Rachael H. <http://oro.open.ac.uk/view/person/rhj9.html>; Fehr, Manuela <http://oro.open.ac.uk/view/person/maf346.html>; Bland, Philip and Gounelle, Matthieu (2013). Lithium isotopes as indicators of meteorite parent body alteration. Meteoritics & Planetary Science, 48(5) pp. 872–878. Journal Item None PeerReviewed 2013 ftopenunivgb https://doi.org/10.1111/maps.12094 2023-05-28T05:49:55Z Hydrothermal processing on planetesimals in the early solar system produced new mineral phases, including those generated by the transformation of anhydrous silicates into their hydrated counterparts. Carbonaceous chondrites represent tangible remnants of such alteration products. Lithium isotopes are known to be responsive to aqueous alteration, yet previously recognized variability within whole rock samples from the same meteorite appears to complicate the use of these isotopes as indicators of processing by water. We demonstrate a new way to use lithium isotopes that reflects aqueous alteration in carbonaceous chondrites. Temperature appears to exert a control on the production of acetic acid-soluble phases, such as carbonates and poorly crystalline Fe-oxyhydroxides. Temperature and degree of water-rock interaction determines the amount of lithium isotope fractionation expressed as the difference between whole rock and acetic acid-leachable fractions. Using these features, the type 1 chondrite Orgueil (δ 7 Li (whole rock) = 4.3‰; Δ 7 Li (acetic-whole) = 1.2‰) can be distinguished from the type 2 chondrites Murchison (δ 7 Li (whole rock) = 3.8; Δ 7 Li (acetic-whole) = 8.8‰) and carbonate-poor Tagish Lake (δ 7 Li (whole rock) = 4.3; Δ 7 Li (acetic-whole) = 9.4‰). This initial study suggests that lithium isotopes have the potential to reveal the role of liquid water in the early solar system. Article in Journal/Newspaper Tagish The Open University: Open Research Online (ORO) Murchison ENVELOPE(144.250,144.250,-67.317,-67.317) Tagish ENVELOPE(-134.272,-134.272,60.313,60.313) Tagish Lake ENVELOPE(-134.233,-134.233,59.717,59.717) Meteoritics & Planetary Science 48 5 872 878 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
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ftopenunivgb |
language |
unknown |
description |
Hydrothermal processing on planetesimals in the early solar system produced new mineral phases, including those generated by the transformation of anhydrous silicates into their hydrated counterparts. Carbonaceous chondrites represent tangible remnants of such alteration products. Lithium isotopes are known to be responsive to aqueous alteration, yet previously recognized variability within whole rock samples from the same meteorite appears to complicate the use of these isotopes as indicators of processing by water. We demonstrate a new way to use lithium isotopes that reflects aqueous alteration in carbonaceous chondrites. Temperature appears to exert a control on the production of acetic acid-soluble phases, such as carbonates and poorly crystalline Fe-oxyhydroxides. Temperature and degree of water-rock interaction determines the amount of lithium isotope fractionation expressed as the difference between whole rock and acetic acid-leachable fractions. Using these features, the type 1 chondrite Orgueil (δ 7 Li (whole rock) = 4.3‰; Δ 7 Li (acetic-whole) = 1.2‰) can be distinguished from the type 2 chondrites Murchison (δ 7 Li (whole rock) = 3.8; Δ 7 Li (acetic-whole) = 8.8‰) and carbonate-poor Tagish Lake (δ 7 Li (whole rock) = 4.3; Δ 7 Li (acetic-whole) = 9.4‰). This initial study suggests that lithium isotopes have the potential to reveal the role of liquid water in the early solar system. |
format |
Article in Journal/Newspaper |
author |
Sephton, Mark James, Rachael H. Fehr, Manuela Bland, Philip Gounelle, Matthieu |
spellingShingle |
Sephton, Mark James, Rachael H. Fehr, Manuela Bland, Philip Gounelle, Matthieu Lithium isotopes as indicators of meteorite parent body alteration |
author_facet |
Sephton, Mark James, Rachael H. Fehr, Manuela Bland, Philip Gounelle, Matthieu |
author_sort |
Sephton, Mark |
title |
Lithium isotopes as indicators of meteorite parent body alteration |
title_short |
Lithium isotopes as indicators of meteorite parent body alteration |
title_full |
Lithium isotopes as indicators of meteorite parent body alteration |
title_fullStr |
Lithium isotopes as indicators of meteorite parent body alteration |
title_full_unstemmed |
Lithium isotopes as indicators of meteorite parent body alteration |
title_sort |
lithium isotopes as indicators of meteorite parent body alteration |
publishDate |
2013 |
url |
https://oro.open.ac.uk/36968/ https://doi.org/10.1111/maps.12094 |
long_lat |
ENVELOPE(144.250,144.250,-67.317,-67.317) ENVELOPE(-134.272,-134.272,60.313,60.313) ENVELOPE(-134.233,-134.233,59.717,59.717) |
geographic |
Murchison Tagish Tagish Lake |
geographic_facet |
Murchison Tagish Tagish Lake |
genre |
Tagish |
genre_facet |
Tagish |
op_relation |
Sephton, Mark <http://oro.open.ac.uk/view/person/mas23.html>; James, Rachael H. <http://oro.open.ac.uk/view/person/rhj9.html>; Fehr, Manuela <http://oro.open.ac.uk/view/person/maf346.html>; Bland, Philip and Gounelle, Matthieu (2013). Lithium isotopes as indicators of meteorite parent body alteration. Meteoritics & Planetary Science, 48(5) pp. 872–878. |
op_doi |
https://doi.org/10.1111/maps.12094 |
container_title |
Meteoritics & Planetary Science |
container_volume |
48 |
container_issue |
5 |
container_start_page |
872 |
op_container_end_page |
878 |
_version_ |
1768376156433678336 |