--> Abstract: Modes of Interaction Between Salt and Basement Tectonics During Inversion: An Examples from the Mid-Polish Trough, by Piotr Krzywiec; #90039 (2005)

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Modes of Interaction Between Salt and Basement Tectonics During Inversion: An Examples from the Mid-Polish Trough

Piotr Krzywiec
Polish Geological Institute, Warsaw, Poland

Salt structures are often initiated during regional extension and subsidence, and might become reactivated during compression and inversion of sedimentary basin. Within intracontinental basins, evolution of salt structures could be triggered by thick-skinned basement normal or reverse faulting. The Permian to Cretaceous Mid-Polish Trough (MPT) evolved above the Tornquist–Teisseyre Zone - crustal boundary between the Precambrian and the Palaeozoic Europe. MPT's Late Cretaceous inversion resulted in significant (re)activation of various salt structures built of the Zechstein evaporites partly formed during MPT's extension/subsidence. Different style of basement vs. cover tectonics in various parts of the MPT resulted in different modes of compression-related reactivation of salt structures. Within the central (Kuiavian) part of the MPT, supra-salt cover fault zone was located directly above the major sub-salt basement fault zone. Along this cover fault zone Klodawa salt diapir grew in Triassic and Jurassic times. During MPT's inversion this fault zone focused reverse tectonic movements, and Klodawa salt structure was only slightly reactivated. During complex basement faulting within the NW (Pomeranian) part of the MPT system of salt structures formed that was significantly reactivated during shortening and inversion. Active growth of salt structures resulted in very complex sedimentary pattern in their immediate vicinity. Delamination and folding of the supra-salt sedimentary cover facilitated development of salt wings. Some of these salt structures have been subjected to SW-directed thrusting, possibly enhanced by gravitational gliding. Comparison of two parts of the MPT provided proxy for more general model of linked salt - basement tectonics during inversion

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005