Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.111..467h&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 111, no. 2-4, July 1992, p. 467-482.
Other
51
Impact Melts, Magma, Meteoritic Composition, Nakhlites, Grain Boundaries, Inclusions, Liquid-Solid Interfaces, Olivine
Scientific paper
Several forms of trapped liquid found within nakhlite meteorites have been examined, including interstitial melt and magmatic inclusions within the cores of large olivine grains. Differences in the mineralogy and texture between two types of trapped melt inclusions, and between these inclusions and the mesostasis, indicate that vitrophyric inclusions are most appropriate for estimating the composition of a nakhlite parental magma in equilibrium with early-forming olivine and augite. Parent liquids were calculated from the mineralogy of large inclusions in Nakhla and Governador Valadares, using a system of mass-balance equations solved by linear regression methods. The chosen parental liquids were cosaturated in olivine and augite and had Mg/Fe values consistent with measured augite/liquid Kds. These parental magma compositions are similar to other published compositions for Nakhla, Chassigny, and Shergotty parental melts, and may correspond to a significant magma type on Mars.
Harvey Ralph P.
McSween Harry Y. Jr.
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