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- W2016206840 abstract "Abstract— Shock defects in the most common silicate minerals of chondrites (olivine, pyroxenes and feldspars) have been investigated in detail, but there have been almost no studies of the shock defects in other components, like metal and sulfide. This probably stems from the fact that these latter phases are opaque in the optical microscope. The same reason explains why veins and melt pockets, which are constituted of microcrystalline or glassy phases (i.e., isotropic) are also poorly documented. We have investigated such phases by analytical transmission electron microscopy (ATEM) in two shocked chondrites, Tenham (L6) and Gaines County (H5). We have characterized shock defects in troilite very similar to those occurring in silicates (i.e., a mosaic texture and sets of straight and very narrow, ⋍10 nm, lamellae of amorphized FeS). There are many small regions in shocked chondrites that are composed of very fine grained (⋍1 μm) mixtures of metal and sulfide or of various silicates. They must result from local melting followed by a rapid cooling that prevented grain growth. We have determined the chemical compositions and the volume proportions of the tiny grains in these veins and melt pockets, which has allowed their temperature and pressure (T, P) history to be partially deciphered. Finally, we have observed a dense network of very narrow fractures (down to 10 nm) in the olivine and enstatite grains. These fractures are systematically filled with an amorphous (or cryptocrystalline) material that stems from the melt pockets and was injected when the fractures were opened by the rarefaction wave. This material was then quenched at the contact with the colder crystalline rims." @default.
- W2016206840 created "2016-06-24" @default.
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- W2016206840 date "1996-03-01" @default.
- W2016206840 modified "2023-09-27" @default.
- W2016206840 title "A transmission electron microscopy (TEM) investigation of opaque phases in shocked chondrites" @default.
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- W2016206840 doi "https://doi.org/10.1111/j.1945-5100.1996.tb02027.x" @default.
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