Lower Miocene Alluvial Deposits of the Po¾e¹ka Mt. (Pannonian Basin, Northern Croatia): Cycles, Megacycles and Tectonic Implications

Geologia Croatica

Marijan Kovačić¹  Davor Pavelić² 

[1] Department of Geology, Faculty of Science;Faculty of Mining, Geology and Petroleum Engineering;

关键词: Braided alluvial fan;    Synsedimentary tectonics;    Sava fault;    Early Miocene;    Pannonian Basin;    Croatia;   

DOI  :  10.4154/GC.1999.05

来源: DOAJ

【 摘 要 】

In the area of the present Po¾e¹ka Mt. braided alluvial fans were

formed during the Early Miocene above the subsiding Cretaceous-

Palaeogene basement. Due to autocyclic processes, i.e. lateral migration

of flows due to vertical aggradation of longitudinal bars, or

migration of the main trench, small-scale fining-upward cycles were

formed. The complete succession of the alluvial deposits is composed

of two fining-upward megacycles, which are the consequence of allocyclic

influences, i.e. the pulsating character of synsedimentary tectonics.

Megacycles were developed parallel to backstepping of the

front of the fault scarp towards the mountain massif, caused by normal

faulting along the active margin of an extensional basin. This

kind of depositional style indicates that the Sava fault operated as a

normal fault at the beginning of its life during the Early Miocene,

probably the Ottnangian.

【 授权许可】

Unknown