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- W2052419005 abstract "Abstract— A single orthopyroxene crystal from the Martian meteorite Allan Hills (ALH) 84001 was studied by X-ray diffraction (XRD) and electron microprobe analysis (EMPA) to retrieve information about its thermal history. Both sets of data were used to measure the Fe2+-Mg order degree between the M1 and M2 sites expressed by the distribution coefficient kD. The 529 ± 30°C closure temperature (Tc) of the Fe2+-Mg ordering process of ALH 84001 orthopyroxene (Fs28) was calculated using Stimpfl (2005a, 2005b) ln kD versus 1/T equation obtained for intermediate iron sample. At this Tc, the orthopyroxene cooling rate, calculated by Ganguly's (1982) numerical method, was 0.1 °C/day. This study puts new constraints on the last high-temperature thermal episode recorded by orthopyroxene. With reference to the geological history (Treiman 1998), we ascribe this episode to the I3 event, and we interpret the Tc of 529 °C as a lower limit for this impact heating. Our data confirm that experimentally defined physical conditions for the formation of magnetite from decomposition of carbonates took place on the Martian surface during event I3." @default.
- W2052419005 created "2016-06-24" @default.
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- W2052419005 date "2007-10-01" @default.
- W2052419005 modified "2023-10-12" @default.
- W2052419005 title "Thermal history of ALH 84001 meteorite by Fe<sup>2+</sup>-Mg ordering in orthopyroxene" @default.
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- W2052419005 doi "https://doi.org/10.1111/j.1945-5100.2007.tb00531.x" @default.
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