Other
Scientific paper
Jan 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35....5p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 1, pp.5-10
Other
22
Scientific paper
The mineral compositions of all members of the mesosiderite group are similar, consisting of roughly equal parts by weight of Ni-Fe metal and silicates, the latter including orthopyroxene and calcic-plagioclase, with minor pigeonite and olivine and accessory tridymite. Heterogeneous mineral distribution and textural variation within individual mesosiderites are common. Silicate brecciation is characteristic, though cataclastic textures are variably obscured by partial recrystallization. Microprobe analyses reveal grain-to-grain silicate compositional variations indicating a variety of original environments and a general lack of equilibrium among phases. Metal-silicate textures indicate that kamacite-taenite structures formed in situ , after the presently observed physical relationships were established by mixing of solid silicates and metal. Metal structures and compositional inhomogeneities indicate extremely slow cooling (~0.1°C/ 10 6 yr) in the temperature range 500-350°C. New chemical analyses reveal a general similarity between silicate portions of mesosiderites and howardites. Previous theories of mesosiderite genesis involving pallasite-achondrite mixing are found to be untenable on the basis of olivine and metal compositions, although mesosiderites do appear to be genetically related to eucrites and howardites. The genetic history of mesosiderites is very complex and includes a significant change in cooling environment. An evolutionary model is described which includes magmatic differentiation, followed by brecciation, metal-silicate mixing, insulation by burial, metamorphism, and, ultimately, removal from the parent body. Mesosiderites are a distinct group, which, aside from the similarities and genetic relationship to Ca-rich achondrites, appear to have no affinities to other meteorite types.
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