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Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001

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Moyano Cambero, Carles Eduard and Trigo Rodríguez, Josep M. and Benito Moreno, María Isabel and Alonso Azcárate, Jacinto and Lee, Martin and Mestres Andreu, Narcís and Martínez Jiménez, Marina and Martín Torres, Francisco J. and Fraxedas, Jordi (2017) Petrographic and geochemical evidence for multiphase formation of carbonates in the Martian orthopyroxenite Allan Hills 84001. Meteoritics & Planetary Science, 52 (6). pp. 1030-1047. ISSN ISSN: 1086-9379 ; ESSN: 1945-5100

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Official URL: https://onlinelibrary.wiley.com/doi/abs/10.1111/maps.12851




Abstract

Martian meteorites can provide valuable information about past environmental conditions on Mars. Allan Hills 84001 formed more than 4 Gyr ago, and owing to its age and long exposure to the Martian environment, and this meteorite has features that may record early processes. These features include a highly fractured texture, gases trapped during one or more impact events or during formation of the rock, and spherical Fe-Mg-Ca carbonates. In this study, we have concentrated on providing new insights into the context of these carbonates using a range of techniques to explore whether they record multiple precipitation and shock events.The petrographic features and compositional properties of these carbonates indicate that at least two pulses of Mg- and Fe-rich solutions saturated the rock. Those two generations of carbonates can be distinguished by a very sharp change in compositions, from being rich in Mg and poor in Fe and Mn, to being poor in Mg and rich in Fe and Mn. Between these two generations of carbonate is evidence for fracturing and local corrosion.


Item Type:Article
Uncontrolled Keywords:Martian, Carbonates, Meteorite, ALH 84001
Subjects:Sciences > Geology > Petrology
ID Code:46970
Deposited On:22 Mar 2018 07:36
Last Modified:11 Dec 2018 08:41

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