Natura Croatica, Vol. 16 No. 4, 2007.
Izvorni znanstveni članak
Major events and stages in the sedimentary evolution of the Paleogene Promina basin (Dinarides, Croatia)
Ljubomir Babić
; Institute of Geology and Paleontology, Dept. of Geology, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
Jožica Zupanič
; Institute of Mineralogy and Petrography, Dept. of Geology, Faculty of Science, University of Zagreb, Horvatovac bb, 10 000 Zagreb, Croatia
Sažetak
A study of sedimentary successions in different parts of the Eocene-Oligocene Promina basin has revealed major changes in the evolution of upper Promina Beds (PB). The first one refers to the origin of the erosional surface cutting different units ranging from Cretaceous limestones to different parts of older PB. It was formed during the fall of relative sea-level, and corresponds to a sequence boundary. This surface is overlain by onlapping alluvial sediments during the lowest relative sea level, and its early rise. The next main event is marked by a transgressive surface above the alluvium, that led to the deposition of shallow-marine limestones with diverse biota in the photic zone, as well as their lagoonal equivalents. This change resulted from an increase in accommodation space outpacing the rate of sediment supply. A further change refers to the deposition of mud with planktonic foraminifera on an outer shelf resulting from a further rise in the relative sea-level, which halted deposition of shallow-water limestones. The subsequent progradation of shelf and delta was related to the slowing down of the creation of accommodation space compared to the increase of sediment supply.
Ključne riječi
alluvium; shelf; Gilbert delta; sequence stratigraphy; Promina Beds; Paleogene; Croatia
Hrčak ID:
28924
URI
Datum izdavanja:
31.12.2007.
Posjeta: 1.805 *