RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 7, ES6001, doi:10.2205/2005ES000189, 2005
[122] The detailed examination of layer J (its uppermost, very thin sedimentary unit J6, whose thickness does not exceed 200 m m) has revealed Ni beads and diamond grains (Tables 17, 18). A layer fragment 1 cm 2 in area separated from a stone cube contained tens of diamond grains (ranging from a submicrons to tens of microns) and hundreds of Ni spherules whose sizes also ranged from a submicrons to tens of microns. Diamond grains and Ni beads of the most typical morphology were examined under a microprobe.
[123] The MPA of Ni beads was conducted on two microprobes (one equipped with WDS and the other with EDS) and have demonstrated that the Ni beads consist of practically pure Ni with a thin outermost film of NiO (Table 17). The surface of all Ni beads is covered with euhedral crystals, which have sizes of 1-2 m m. Such pure Ni in the form of beads, whose surface is lined with crystals has never been found either in magmatic rocks or meteorites, in which Ni always contains significant admixtures.
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Figure 32 |
Citation: 2005), A new look at the nature of the transitional layer at the K/T boundary near Gams, Eastern Alps, Austria, and the problem of the mass extinction of the biota, Russ. J. Earth Sci., 7, ES6001, doi:10.2205/2005ES000189.
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