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Creator |
6db47456ef992611478fd3d3b7990c24 |
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Creator |
bd12e480200a0e58504d6106bfed3c8a |
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Creator |
ext-ea647092129552716d13a12057ba6860 |
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Creator |
ext-5d60ddce3e273e8c9438399808b6d69a |
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Creator |
ext-0ed0221de8e98888dd43867048ad0efe |
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Creator |
ext-1eddee16df240c4d2e9e9383e52fe148 |
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Creator |
ext-7997d15cb9476c2147bea80438c395e0 |
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Creator |
ext-ccb1ba89126b7295ecbfa2296a985065 |
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Creator |
ext-d61b6b9c6a703202d29b9dca342cd314 |
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Creator |
ext-d7ce09426e01c493c137500524fee65e |
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Creator |
ext-dbb2d2465e81b567c46cf2e3176585e9 |
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Date |
2015-03 |
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Is Part Of |
repository |
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abstract |
The heavy noble gases (Ar, Kr, Xe) are key tracers of planetary outgassing, atmospheric
formation, and atmospheric evolution. On Mars, at least 3 distinct noble gas signatures
have been observed: (1) Noble gas ratios different from the curent Mars atmosphere,
but derived from mantle sources, was first found in Chassigny. (2) Shergottites, especially
their shock glasses, contain unfractionated Martian atmosphere. (3) The nakhlite Martian
meteorites and the ortho-pyroxenite ALH84001 contain fractionated Martian atmosphere
that has been explained through several possible mechanisms: (1) The fractionation
could represent ancient Martian atmosphere with a noble gas signature different from
today. (2) The elementally fractionated noble gases could have entered the rocks via
magma, either as a crustal component or via magmatic assimilation of aqueously altered
crustal rock. (3) The elementally fractionated noble gases could have entered the
rock during the formation of aqueous alteration minerals. Using data from Lafayette
‘iddingsite’, pure pyroxene mineral separate and whole rock samples, we have previously
calculated that such an aquously fractionated component could have a <sup>84</sup>Kr/<sup>132</sup>Xe
of ~8.
<br></br><br></br>
All meteorites that show a fractionated Martian atmospheric component contain alteration
products. Carbonates are the main alteration product in ALH 84001, accompanied by
magnetite. In the nakhlites several alteration phases have been found; Lafayette contain
carbonates, clay (ferric saponite, serpentine), sulfides, and an amorphous component. |
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authorList |
authors |
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presentedAt |
ext-674e04020898bb4b15d304be0a06ee95 |
| 42493 |
status |
nonPeerReviewed |
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type |
AcademicArticle |
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type |
Article |
| 42493 |
label |
bullock, M. A.; Schwenzer, S. P. ; Bridges, J. C.; Chavez, C.; Filiberto, J.; Kelley,
S. P. ; Miller, M.; Moore, J. M.; Smith, H.; Swindle, T. D. and Treiman, A. H. (2015).
Noble gas fractionation during low temperature alteration: an experimental approach.
In: 46th Lunar and Planetary Science Conference, 16-20 Mar 2015, The Woodlands, TX,
USA. |
| 42493 |
label |
bullock, M. A.; Schwenzer, S. P. ; Bridges, J. C.; Chavez, C.; Filiberto, J.; Kelley,
S. P. ; Miller, M.; Moore, J. M.; Smith, H.; Swindle, T. D. and Treiman, A. H. (2015).
Noble gas fractionation during low temperature alteration: an experimental approach.
In: 46th Lunar and Planetary Science Conference, 16-20 Mar 2015, The Woodlands, TX,
USA. |
| 42493 |
Title |
Noble gas fractionation during low temperature alteration: an experimental approach. |
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in dataset |
oro |