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New thermobarometers for martian igneous rocks, and some implications for secular cooling on Mars by Jerrod Lessel; Keith Putirka is a Earth and Planetary Sciences article available to read on EtoBox.

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Tests show that terrestrial mineral+liquid geothermobarometers are not well equipped for use on martian rocks, which tend to have much higher FeO and lower Al 2 O 3 . Here, we present new calibrations of thermometers and barometers using experimental data on martian samples from the literature. These new models recover P-T conditions with a greater accuracy compared to models calibrated using terrestrial compositions. We applied these new calibrations to primitive martian mantle-derived melts Yamato 980459 (Y98) and Northwest Africa (NWA) 6234 and several surface basalts (Gusev). Our new models yield similar P-T conditions for NWA and Y98 compositions of 1.4-1.7 GPa and 1500-1550 °C, which are close to estimates by most prior studies. Our models yield somewhat lower P estimates compared to Lee et al. (2009), apparently because our Si-activity model (from Beattie 1993) includes an Al 2 O 3 -correction (where lower Al 2 O 3 , as in martian samples, leads to lower P estimates). For Gusev basalt compositions, our new models yield P-T estimates of 1.0-1.3 GPa and 1340-1390 °C; furthermore, we also obtain P = 1.03 GPa and T = 1340 °C, for a Gusev composition from Monders et al. (2007), w

Who reads New thermobarometers for martian igneous rocks, and some implications for secular cooling on Mars?

Author

Jerrod Lessel; Keith Putirka

Publisher

Mineralogical Society of America; Walter de Gruyter GmbH (ISSN 0003-004X)

Published

2015

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)