Lunackova ulica 4

Ljubljana, Slovenia

Lunackova ulica 4

Ljubljana, Slovenia
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Skaberne D.,Geological Survey of Slovenia | Turk I.,Lunackova ulica 4 | Turk J.,Slovenian National Building And Civil Engineering Institute
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2015

The clastic sediments in the Divje babe I cave consist mainly of autochthonous terrigenous dolomite clasts, allochthonous terrigenous non-carbonate grains, and biogenic fragments, especially remains of the cave bear. These components are frequently cemented by apatite and subordinate calcite cement into aggregates (concretions) and into breccia. The formation and transformation of cave sediments were affected by climate and to some extent by the duration of sediment exposure to surface conditions on the cave floor. Congelifracts, a product of frost action, and cavernously corroded clasts, a result of corrosion by condensation and percolating water, were formed before being covered by younger sediments. Thus, the distributions of congelifracts and cavernously corroded clasts can be used to interpret climate changes in the period of 39.7 to 116.1ka, with at least four hiatuses lasting from 9.0 to 39.7ky. Based on the relative abundance of congelifracts, the palaeoclimate record can be correlated with global temperature changes established by oxygen isotopes δ18O from the Greenland ice. The succession C (cold)-H (humid), layers 2 to 11-12, is correlated with the lower part of OIS 3 and OIS 4, while the succession T (temperate)-D (dry), layers 12-13 to 23, is correlated with OIS 5. © 2015 Elsevier B.V.


Skaberne D.,Geological Survey of Slovenia | Turk I.,Lunackova ulica 4 | Turk J.,Slovenian National Building And Civil Engineering Institute
Palaeogeography, Palaeoclimatology, Palaeoecology | Year: 2015

Different grain size fractions of clastic sediments (40-65, 0.5-3, and <0.5mm) from the Divje babe I cave were chemically analysed. In the chemical composition of the medium and fine fractions, four groups of variables were revealed: 1) MgO, LOI, TOT/C - dolomite, autochthonous terrigenous component; 2) P2O5, TOT/S, Mo, Sr, Cu, CaO, and so on - bones/apatite cement, biochemical chemical components; 3) SiO2, Al2O3, REE, Rb, Zr, K2O, Th, TiO2, Fe2O3, and so on - non-carbonate, allochthonous terrigenous components; and 4) U (Cd, MnO) - more mobile chemical components. Vertical distributions of P2O5, SiO2, and U in the fine fraction suggest five geochemical boundaries. The origin of P2O5 is attributed mainly to the cave bear. A negative correlation between the content of SiO2 and cavernously corroded clasts (indicating a humidity), indicates a dominant aeolian transport of non-carbonate material into the cave. Vertical distribution of U indicates the migration of U and its enrichment in the deeper parts of the sedimentary sequence. The mobilization of U was influenced by the duration of exposure of the sediments on the cave floor. The chemical characteristics of non-carbonate material indicate that source rocks probably belong to the Triassic volcanic, volcanogenic and terrigenous sedimentary rocks. © 2015 Elsevier B.V.

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