By Grachev A.F.
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Extra resources for The K/T boundary of Gams (Eastern Alps, Austria) and the nature of terminal Cretaceous mass extinction
Example text
Very interesting results on He isotopy were obtained from suspended material of glacial water of Mount Elbrus [Sobotovich, 1976]. 5×10−5 , nearly coinciding with values obtained from deep oceanic red clays. 1×10−8 , which is two to three orders smaller and close to usual values of rocks of the continental crust [Sobotovich, 1976]. , 1980, and many others]. Naturally, the study of He isotopy in the K/T layer is of great significance for the possibility of detecting solar helium traces. , 1985]. However, the ratio 3 He/4 He could be determined only for one bulk sample), in which the ratio of 14×10−6 was obtained at the atmospheric value of the ratio 40 Ar/36 Ar.
2007b]. , 1999], but, in the Gams section, zircon is present in approximately equal amounts in all parts of the transitional layer. , 1996]. However, no data point to the presence of Li minerals in the layer J. , this effect is negligibly small. 9. , 1998]. , in the sedimentation conditions) during the deposition of the layer J. , 2001]. However, the smallest values of the ratio 3 He/4 He are obtained for the upper part of the Gams section, where some features indicating an impact? , 2005, 2008b].
The REE concentration in sample L6 is systematically higher in the clay fraction than in the whole-rock sample. The chondrite-normalized REE patterns of the Gams sequence generally confirm the known characteristic of clayey shales, namely, their uniform REE patterns [Taylor, McLennan, 1985]. The most conspicuous features of the REE patterns of the rocks are their pronounced enrichment in LREE and weak Eu anomalies. 6. 5. 3 7 11 7 8 11 10 18 5 15 17 13 17 16 14 26 13 18 17 38 34 46 44 36 40 40 51 61 167 180 185 177 190 100 151 150 161 154 141 120 111 85 62 96 V 33 68 112 24 13 21 17 25 26 97 88 78 66 68 33 29 37 63 40 34 51 53 58 36 83 7 7 6 8 10 7 8 7 7 40 40 42 39 41 25 16 13 10 15 13 15 28 20 17 35 98 87 105 64 53 44 50 51 77 162 169 180 177 192 74 90 78 73 79 80 80 84 98 47 120 Cu Pb Zn Note: Transitional layer J is shown by bold; nd – not determined.