Naslov
Quartz diagenetic sediments within the Upper Albian shallow-marine carbonate sequences in Central Istria (Croatia)

Autori
Barudžija, Uroš

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

Izvornik
22nd IAS Meeting of Sedimentology - Opatija 2003: Abstracts Book / Vlahović, Igor - Zagreb : Hrvatski geološki institut, 2003

Skup
22nd IAS Meeting of Sedimentology - Opatija 2003

Mjesto i datum
Opatija, Hrvatska, 17.09.2003. - 19.09.2003

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
quartz diagenetic sediments; Upper Albian shallow-marine carbonates; silicification; Central Istria; Croatia

Sažetak
The occurrences of &#8220 ; quartz diagenetic sediments &#8221 ; (QDS) were investigated within the Upper Albian shallow-marine carbonate sequences in Tinjan area (Central Istria).Thicknesses of several continuous layers of QDS (occasionally breaked by minor faults) generally increase (up to 2m) toward the Southern Istria (GALOVIĆ, 1991). These sediments were formed due to early-diagenetic silicification of unconsolidated carbonate deposits.The source silica-material for (see Durn et al., 2003).Tinjan area is characterised by up to15 cm thick QDS-layers, occurring within the shallowing-upward sequences composed of carbonate breccias, laminated peloidal wackestone/packstones and laminated cyanobacterial limestones.Quartz diagenetic sediments contain idiomorphic authigenic quartz crystals (type 1) or microcrystal quartz aggregates (type 2), while chert-like clusters (type 3 of QDS occurring in Istria) are subordinate. Intraformational carbonate breccias (sporadically containing black pebbles) reflect short emergence followed by silicification. Silicification also took place within the laminated peloidal wackestone/packstones and laminated cyanobacterial limestones. Different paleotopography in this part of the Adriatic Carbonate Platform during the Upper Albian caused development of thinner QDS-layers in Central Istria, compared with the thicker QDS-layers in Southern Istria.This paleotopography is the consequence of sinsedimentary tectonics and relative uplift of the Central Istria caused by gentle folding and/or during Cretaceous (Matičec et al., 1996).

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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