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Jurassic - Early Cretaceous development of the peri-Carpathian (SE) segment of the Mid-Polish Trough in the light of results of analogue models

Gutowski J., Koyi H.

Volumina Jurassica

2006

Vol. 4, no. 1

45-46

A series of analogue models are used to demonstrate how multistage development of the Mid Polish Trough (MPT) can be influenced by oblique basement strike-slip faults (Gutowski & Koyi 2006). In the light of the results, Jurassic - Early Cretaceous tectonic evolution of the SE Mid-Polish Trough can be interpreted in terms of relative movement of basement blocks bounded by strike-slip faults which segmented the basin. Based on interpretation of geophysical, well and outcrop data, the following successive stages in the basin history are simulated in the models: 1. Oblique extension of the NW segment of the MPT accompanied by sinistral movement along the Holy Cross Fault Zone (HCF, Early Triassic - latest Early Jurassic). 2. Oblique extension of both the NW and SE segment of the MPT, parallel to the HCF (latest Early and Middle Jurassic). 3. Oblique extension of the SE segment of the MPT and much lesser extension of its NW segment connected with dextral movement along the HCF (Early Oxfordian - latest Early Kimmeridgian) (Fig. 1A). 4. Oblique extension of the SE segment of the MPT and much lesser extension of its NW segment connected with dextral movement along the Zawiercie Fault (ZF, latest Early Kimmeridgian - Valanginian) (Fig. 1B). The different sense of movement of the HCF and ZF resulted in successive extensional en echelon fault systems, which widely penetrated the south-western margin of the MPT (Fig. 1). The en echelon fault systems interfered with the SW bounding fault system of the MPT. The NE margin of the SE segment of the MPT is a typical, steep and distinctly marked graben margin fault zone, dominated by normal and dip-slip/strike slip faults parallel to its axis. A specific pull apart basin developed in the zone between the HCF and SW border fault of the SE segment of the MPT during Oxfordian and Early Kimmeridgian times (Fig. 1A). It resulted from interaction between the en echelon fault system and dip slip fault system bounding the MPT. Extensive south-westward progradation of the shallow water carbonate and continental clastic depositional systems of the Late Oxfordian - Early Kimmeridgian onto the central part of the basin located above the HCF was controlled by development and propagation of en echelon relay ramps along the NE wedge of the MPT (Fig. 1A''). These ramps were faulted during the Late Kimmeridgian-Tithonian - earliest Berriasian due to reorientation of the extension direction from WNW-ESE to W-E (Fig. 1B'-B''). Dextral strike-slip movement of the HCF was replaced by dextral strike slip movement along the ZF. The same mechanism controlled also propagation of the depocenter from the western to the eastern margin of the basin.