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- W119674094 abstract "Summary A 35 mm square slice of Buzzard Coulee meteorite was cut with a wire-saw and polished. The brecciated structure of the meteorite is evident, especially in the silicate matrix. The slice was further examined using a micro-XRF. Approximately 1 million spots in five images were mosaiced to give an overall resolution of 40 micrometres per pixel. 8-bit grey scales images were produced for many major and minor elements, however, the system is not very sensitive for elements lighter than magnesium. Elemental maps were adjusted for contrast and then assembled into three-colour composite images for further interpretation. The overall composition was kamacite = 10.9%; taenite = 0.23%; troilite = 3.7% with the remainder dominated by silicates. Maps of Cr, Cu, P and Ca reveal the presence of sparse grains of chromite, chalcopyrite and Ca-phosphate (merrilite?). Mineral distribution was heterogeneous throughout the slice and conformed to some extent to the fragments identified in the scanned image. The distribution of sulphides is particularly interesting and may reveal other fragments. In one part of the slice a foliation is clearly visible, revealed both by the orientation of flattened chondrules and metal grains. Adjoining chondrules are indented suggesting pressure solution during compaction. Hence, there seems to evidence of deformation during lithification, a normal process on earth but perhaps less expected on an asteroid." @default.
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- W119674094 date "2010-01-01" @default.
- W119674094 modified "2023-09-24" @default.
- W119674094 title "Micro-XRF Study of Buzzard Coulee Meteorite" @default.
- W119674094 hasPublicationYear "2010" @default.
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