Compositional Variation and Homogenization Kinetics of Serpentine in Hydrous alteration processes of Carbonaceous chondrite parent body: An Experimental study under reducing conditions

Details Compositional Variation and Homogenization Kinetics of Serpentine in Hydrous alteration processes of Carbonaceous chondrite parent body: An Experimental study under reducing conditions Compositional Variation and Homogenization Kinetics of Serpentine in Hydrous alteration processes of Carbonaceous chondrite parent body: An Experimental study under reducing conditions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmmr13b1707o&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #MR13B-1707

Physics

1028 Composition Of Meteorites (3662, 6240), 3662 Meteorite Mineralogy And Petrology (1028, 6240)

Scientific paper

Carbonaceous chondrites are the most primitive planetary materials which consist of various disequilibrium assemblages of minerals derived from various stages of the early solar system. Especially, hydrous phyllosilicate minerals in CM chondrites are the first products of aqueous alteration on the meteorite parent body, and those show huge compositional variation. The main mineral species of the hydrous phyllosilicate minerals in CM chondrites are serpentine, saponite and tochilinite. Compositional variation involving homogenization processes in the phyllosilicate minerals may have essential information on the timescale of the aqueous alteration processes on the parent body. In this study, we carried out aqueous alteration experiments of heterogeneous starting materials with fluid containing ethanol to keep reducing conditions representative to the early solar system remaining the solar nebula gas. We have carried out aqueous alteration experiments of synthetic olivine (Fo55) with synthetic fayalite or enstatite. Fo55 olivine represents the Mg/ (Mg + Fe) molar ratio of the solar abundance. Fayalite or enstatite represents Fe-rich or Fe-poor components in the heterogeneous parent body, respectively. Experimental fluids are ethanol solutions with 0.5, 2.5 or 10.0 vol. %. Decomposition of ethanol supply reducing agent to the fluid and keep the oxidation condition of the system on the C-CO buffer. Experimental temperatures are 100, 150, 200, 250 and 300°C with vapor pressure, and 400 and 500°C with 100MPa.Run durations are 3 to 12 weeks. Run products are analyzed by XRD and SEM / EDS. Aqueous alteration experiments of Allende meteorites show that Mg / Fe compositions of serpentine in the run products with higher temperatures show broader distribution to Mg-rich composition than that of 200°C experiments. Mg-rich olivine derived form chondrules contribute to produce serpentine in higher temperature. Mg / Fe composition range of serpentine is getting narrower with run duration (Isobe and Ozaki, 2008). Quantitative kinetics of the evolution and compositional variations of the phyllosilicate produced in the aqueous alteration from the heterogeneous starting materials will be discussed.

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