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Lenart, Alenka; Jeršek, Miha; Mirtič, Breda; Šturm, Sašo
Geologija (Ljubljana, Slovenia), 12/2010, Letnik: 53, Številka: 2Journal Article
The composition of the well-preserved fusion crust of the meteorite Jesenice was characterised by means ofoptical and scanning electron microscopy (SEM). The SEM investigations revealed three structurally distinct layerswithin the crust. The features of the first layer on the surface are precipitates, enriched in metal elements (iron,nickel), and the partial melting of silicate grains, which continues deeper into the second layer. The second layerbeneath has veins with a heterogeneous composition that indicates a different source of melting minerals. The thirdlayer, which is located deeper within the fusion crust, has not undergone any structural changes and its features aresimilar to the interior of the meteorite. This is additionally confirmed by the presence of cracks, which are a consequenceof shock metamorphism, and irregularly shaped metal and sulphide grains. The structural changes of thethin fusion crust on the surface of this stony meteorite indicate high temperatures (more than 1500 °C) accompaniedby high pressures.
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