Naslov
Dolomitization at the gypsum-anhydrite transition zone (Kosovo Polje quarry, Croatia)

Autori
Borojević Šoštarić, S., Kulusic, A., Neubauer, F.

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstracts, PanGeo Austria 2012 / - Salzburg : University of Salzburg, 2012, 30-30

Skup
Abstracts, PanGeo Austria 2012

Mjesto i datum
Salzburg, Austrija, 15.09.2012. - 20.09.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
evaporite melange; dolomitization; petrography; Dinarides

Sažetak
Kosovo polje evaporite quarry, Croatia (350 Ha), is hosted by carbonate platform units and covered by Lower Triassic rauhwacke and Neogene deposits of variable thickness (up to 30 m). Evaporites are composed of gypsum, anhydrite and dolomite ± autigenic quartz and opaque minerals. Gypsum occurs as fine to coarse-grained polycrystalline agregate with seriate to equiangular grain boundaries suppressing anhydrite, whereas fibrous gypsum suppressing polycrystalline gypsum and anhydrite is common within shallow parts of the deposit. Similar fabrics are recognized within anhydrite, implying multiple recrystalization and re/dehidration processes. Dolomite occurs as: (i) non-planar –a fine-grained, anhedral crystals, <5 microne in size. They are associated with organic matter and terrigenous quartz silt within fragments or clasts of micrite, most likely originated from carbonate intercalations within evaporite. Non-planar a dolomite is an indicator of elevated temperature (>50 °) or supersaturated solution, and most likely linked to the first gypsum to anhydrite transition during burial. (ii) Planar – s dolomite is fine-grained, 5 – 20 microne in size with polygonal grain boundary and organic matter suppressed within discrete stylolite zones ; whereas (iii) fine to coarse grained planar –e rombohedral dolomite crystals suppress non-planar and planar-s dolomite. Volume abundance priori to dolomitization is filled with fibrous gypsum or anhydrite.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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