Naslov
Origin and composition of Upper Tithonian marly layers from Kirmenjak Quarry (Istria, Croatia)

Autori
Pikelj, Kristina ; Mezga, Aleksandar

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

Izvornik
25th IAS Meeting of Sedimentology, Abstracts Book / Zelilidis, Avram - Patras, 2007

Skup
25th IAS Meeting of Sedimentology

Mjesto i datum
Patras, Grčka, 04.09.2007. - 07.09.2007

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
Marls; Upper Tithonian; Kirmenjak; Croatia

Sažetak
The Upper Tithonian carbonate succession of the Kirmenjak quarry belongs to the lowermost part of the second Istrian megasequence and is characterized by numerous shallowing-upward cycles and dinosaur footprints as well. Shallowing-upward cycles range from 0.5 to 1.5 m in thickness and usually begin with black pebble breccia or mudstones, followed by fenestral mudstone, and usually end with peloidal packstone/grainstones and grainstones. On the top of one of the shallowing-upward succession, dinosaur footprints were found in intertidal fenestral mudstones. Almost a thousand of sauropod footprints, including 23 single trackways, have been recognized on the locality. Approximately one meter below the trackbearing horizon a 2-3 cm thick marly layer occurs. Investigated marly layer overlay black-pebble breccia and represent an emersion phase in the succession. The marl samples were preliminary examined by X-ray diffraction method. The results show the presence of vermiculite, muscovite and/or illite, quartz and calcite. Such composition could be the result of the different mineral origin. Muscovite and quartz could be of an eolian origin whereas vermiculite and illite probably indicates paleo-soils. Together with the dinosaur footprints this marly layer implies frequent emersion phases and establishment of continental conditions during the long-lasting period

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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