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Sulfur in apatite from the Nakhla meteorite record a late-stage oxidation event
2022, Earth and Planetary Science LettersCitation Excerpt :This could be because one or both phases are xenocrysts included in the nakhlite parent magma prior to final accumulation and solidification (Treiman, 1990). Alternatively, the Mg/Fe discrepancy could be because the olivine grains record variable extents of diffusive re-equilibration with the mesostasis melt near the solidus temperature of the system (Harvey and McSween, 1992; Longhi and Pan, 1988) due to the relatively faster diffusion of cations in olivine grains compared to pyroxene grains (e.g., Freer et al., 1982). In the latter scenario, differences in the gradients of Mg/Fe in olivine grains between the nakhlites Nakhla, Governador Valadares, and Lafayette suggest variations in relative cooling times from short (Nakhla) to long (Lafayette) during emplacement as a thick surface lava flow or shallow crustal intrusion, and potentially revealing a stratigraphic relationship between the nakhlites (Harvey and McSween, 1992).
Matrix deformation mechanisms in HP-LT tectonic mélanges - Microstructural record of jadeite blueschist from the Franciscan Complex, California
2012, TectonophysicsCitation Excerpt :The sharp and approximately plane rear boundary of the selvage (Fig. 10a), separating it from the broken host, indicates that the selvage is formed by epitactic growth on the broken host and not by diffusive exchange between the old crystal and the fluid phase. This interpretation is in accordance with extremely sluggish diffusion in clinopyroxenes (e.g. Freer et al., 1982) and the low temperatures. In this case, the sharp rear boundary represents the original fracture surface.
Open system behavior of olivine-hosted melt inclusions
2000, Earth and Planetary Science LettersCalcium self-diffusion in natural diopside single crystals
1996, Geochimica et Cosmochimica Acta