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Phosphate nodules in the condensed Brentskardhaugen Bed (Toarcian-Bathonian) of Spitsbergen show microstructures suggesting stages of diagenetic and burial recrystallization of sedimentary apatite. Remnants of the primary globular apatitic fabric witness rapid development of mineral phosphate phase in nearsurface environment of the condensed sediment facies. This primary fabric was a subject of diagenetic...
The Lower Jurassic Huciska Limestone Formation (lower Sub-Tatric nappe) in the Western Tatra Mountains locally hosts lens-like bodies of Mn-ore deposit (the Banie Ore Bed). The ore is composed of crinoidal sediment containing both Mn-oxides (bixbyite, hausmannite, todorokite, birnessite) and Mn-carbonates (manganic calcite, kutnahorite, calcic rhodochrosite, rhodochrosite). This composition reflects...
Fossiliferous phosphate nodules in the condensed Brentskardhaugen Bed (Toarcian-Bathonian) in Spitsbergen show common collapse and injection microstructures associated with stages of phosphatization of biogenic carbonate skeletal remains. These structures provide supporting evidence for the nature of early phosphate replacement of biogenic carbonate in clastic condensed environment of the Jurassic...
Clay -mineral investigations were carries out on Jurassic marine black shale samples of the Janusfjellet Subgroup (Upper Bathonian-Hauterivian) collected from four field sections at Van Keulenfjordrn and Isfjorden, Spitsbergen. Based on the presence or absence of kaolonite in the Jurassic parts of the stratigraphic columns studied, three subunits have been distinguished: (i) the kaolinite- bearing...
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