Natura Croatica, Vol. 17 No. 4, 2008.
Izvorni znanstveni članak
Evolution of a river-fed foreland basin fill: the North Dalmatian flysch revisited (Eocene, Outer Dinarides)
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, 10000 Zagreb, Croatia
Sažetak
The sedimentary evolution of the Eocene, Outer Dinaric foreland basin of N Dalmatia began with carbonate deposition on a retreating foreland ramp. The clastic deposition starts with an early or flysch stage represented by orogen-related, river-fed, distal prodelta sand lobes, and associated hemipelagites. The subsequent, filling stage reflects the shallowing caused by the progradation of the proximal prodelta. It is followed by deposition in front of the braidplain delta or braid deltas, which might have resulted from the continuation of the filling stage, or possibly indicates the steady state (filled stage). This sedimentary evolution is comparable to the evolutionary trend typical for peripheral foreland basins, especially those of the alpine realm, and is closely related to the foreland and orogen tectonic evolution. The clastic deposition mainly occurred from flood-generated density underflows ensuing from multiple delta outlets. These flows may have been influenced by oscillatory flows. The relevant drainage basin was characterised by intense erosion in a mountainous area, related to active compressional tectonics in the rising orogen, and by powerful streams.
Ključne riječi
foreland basin; hyperpycnal underflows; prodelta; delta front; flysch; Paleogene; Outer Dinarides
Hrčak ID:
34036
URI
Datum izdavanja:
31.12.2008.
Posjeta: 1.768 *