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Creator |
96fdb8f74aad60e762b1aef18d80ab45 |
| 37358 |
Creator |
bd12e480200a0e58504d6106bfed3c8a |
| 37358 |
Creator |
36b123b254423e86b2aad9ab1284ddee |
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Creator |
970b917038a425943ae594e993a37e66 |
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Date |
2013 |
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Is Part Of |
repository |
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abstract |
The origin of secondary carbonate minerals in the martian meteorite ALH84001 has been
intensely debated in the literature, with widely different thermal origins considered:
from hydrothermal [e.g. 1] to low temperature alteration [e.g. 2]. Isotopic evidence
suggests the carbonates precipitated from evaporating water at 18±4 ºC under near-surface
conditions [3]. We tested this latter scenario with the thermochemical modelling program
CHIM-XPT at 15, 20 and 25 ºC; and pressures of 1 and 2 bar of atmospheric CO<sub>2</sub>.
The water-to-rock ratio (W/R) was varied to obtain alteration precipitates. Isothermal
evaporation scenarios were also modelled starting from W/R≤5. The composition of the
ALH84001 host rock was obtained from [5] and the secondary phases were not included
in the unaltered rock composition modelled. The composition of the starting fluid
consisted of water equilibrated with 1 or 2 bar of atmospheric CO<sub>2</sub>. |
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authorList |
authors |
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presentedAt |
ext-90357dc060e32d0937c573a8473acd85 |
| 37358 |
status |
nonPeerReviewed |
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type |
AcademicArticle |
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type |
Article |
| 37358 |
label |
Melwani Daswani, M. ; Schwenzer, S. P. ; Wright, I. P. and Grady, M. M. (2013).
Thermochemical modelling of the alteration assemblage in Martian Meteorite ALH84001
at low temperature (15–25 °C). In: The 3rd UK in Aurora Meeting: Advances in Mars
Science, 8 Feb 2013, London, UK. |
| 37358 |
label |
Melwani Daswani, M. ; Schwenzer, S. P. ; Wright, I. P. and Grady, M. M. (2013).
Thermochemical modelling of the alteration assemblage in Martian Meteorite ALH84001
at low temperature (15–25 °C). In: The 3rd UK in Aurora Meeting: Advances in Mars
Science, 8 Feb 2013, London, UK. |
| 37358 |
Title |
Thermochemical modelling of the alteration assemblage in Martian Meteorite ALH84001
at low temperature (15–25 °C) |
| 37358 |
in dataset |
oro |