Structural style in a Messinian (intra-Pontian) gravity-driven deformation system, western Black Sea, offshore Romania
作者： Z. Schleder , C. Krezsek , A. Lapadat , Z. Bega , G. Ionescu
关键词: Tectonics 、 Anticline 、 Geology 、 Graben 、 Trough (geology) 、 Paleontology 、 Cuspate foreland 、 Rollover anticlines 、 Fault block 、 Diapir 、 Petrology
摘要: Miocene sediments of the western Black Sea failed gravitationally during intra-Pontian (Messinian) sea-level fall. In region Histria Trough, this generated two independent collapse systems detaching on upper part Oligocene–Lower shale. This contribution focuses eastern system. The linked system is approximately 60 km long in dip direction, containing about 10 major extensional faults updip domain, with a cumulative extension (heave) 11.4 km. accommodated downdip partially by 6 – 7 km lateral compaction and single toe thrust 4.8 km shortening. thin-skinned both basinwards-dipping counter-regional (dip towards basin margin), associated rollovers, tilted fault blocks keystone graben. Broad shale pillow (3 km across) cuspate upwelling developed due to reactive diapirism. rollover anticlines into half-graben suggests high deformation rate. Downdip, follows top unit steps up Sarmatian. hanging-wall anticline collapsed triggered mass transport complex (MTC). MTC rugose surface, we suggest that it remained under water Messinian event its lack visible erosion.
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