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Triassic evolution of the Kłodawa salt structure: basement-controlled salt tectonics within the Mid-Polish Trough (Central Poland)

100%

Krzywiec P.

tom Vol. 48, No 2

123--134

The Mid-Polish Trough formed the axial part of the Polish Basin belonging to a system of the Permian-Mesozoic epicontinental basins of Western and Central Europe. It was filled by several kilometres of siliciclastics and carbonates, including thick Zechstein (approximately Upper Permian) evaporites. TheMid-Polish Trough was inverted in the Late Cretaceous-Paleocene times, when it was strongly uplifted and eroded. The presence of thick salt significantly influenced Triassic evolution of the central (Kuiavian) part of theMid-Polish Trough where the Kłodawa salt structure is located. Analysis of seismic data calibrated by several deep wells point to three main stages of the Triassic evolution of this structure. During Early andMiddle Triassic Kłodawa salt pillow grew above the basement extensional fault zone, during early Late Triassic (approx. time of deposition of the Lower Gypsum Beds) Kłodawa salt structure reached diapiric stage and salt eventually extruded on to the basin floor. Last stage was characterised by rather uniform sedimentation and lack ofmajor saltmovements. Wojszyce salt pillow located north-east of the Kłodawa salt structure grew until the Late Triassic (approx. time of deposition of the Upper Gypsum Beds) when basement fault zone located below it was probably inverted. This inversion triggered formation of the salt-cored Wojszyce Anticline and was followed by localised erosion and rather uniform Norian–Rhaetian (Lower Kłodawa Beds) sedimentation above the anticline. Local tectonic activity below the anticline might have additionally enhanced growth of the Kłodawa salt diapir. The presented tectono-sedimentary model of the relationship between basement and salt tectonics and their influence on the Triassic depositional systems is compatible with results of analogue modelling of linked basement-salt tectonics, and with a model based on mesostructural studies completed for the Kłodawa salt mine.

Sedimentation and tectonics of the Upper Proterozoic-Lower Cambrian deposits of the Southern Małopolska Massif (SE Poland)

100%

Moryc W. , Łydka K.

tom Vol. 44, Nr 1

47-58

In the latest Precambrian and Early Cambrian, turbidity currents and cohesive flows transported pebbles, sand and mud into a deep water in south-east Poland, this sediment probably being sourced from Gondwana. Abundant detrital albite grains suggest volcanism during sedimentation. Pebbles in conglomerate interbeds are polymict and include rock fragments showing greenschist facies regional metamorphism in the source area. The Precambrian surface in the marginal part of the Carpathians lies at 2000-5000 m b.s.l., whereas farther south, around Kuźmina it reaches 7000 m. Still farther south (Krosno-Sanok-Baligród) geophysical evidence suggests it lies at about 17-20 km depth.

Regionalne badania magnetotelluryczne w polskich Karpatach zachodnich

84%

Czerwiński T. , Klityński W. , Florek R. , Stefaniuk M.

tom T. 29, z. 3--4

169-195

W latach 1997-2002 Przedsiębiorstwo Badań Geofizycznych w Warszawie wykonało regionalne badania magnetotelluryczne w polskich Karpatach. Prace pomiarowe skoncentrowane zostały w dwóch wyodrębnionych regionach - zachodnim i wschodnim. W części zachodniej sondowania magnetotelluryczne wykonano wzdłuż sześciu profili poprzecznych do głównej osi orogenu i dwóch równoległych do niej. Prace pomiarowe prowadzono za pomocą systemu MT-1 w zakresie częstotliwości 300-0.0005 Hz. W interpretacji ilościowej sondowań wykorzystano automatyczną inwersję 1D przy użyciu algorytmów Bosticka, Occama i LSQ. Dwuwymiarowe przekroje oporności opracowano na podstawie wyników automatycznej inwersji metodą LSQ. Do ich konstrukcji wykorzystano również wyniki automatycznej inwersji 2D metodą RRI, informacje geologiczne i wiertnicze oraz dane sejsmiki refleksyjnej. Najważniejszymi wynikami interpretacji są przekroje opornościowe i mapy strukturalne horyzontów wysokooporowych, związanych ze stropami podłoża mezopaleozoicznego i prekambryjskiego.

The Geophysical Exploration Company, Warsaw, conducted regional magnetotelluric survey in the Polish Carpathians in the years 1997-2002. The measurements were concentrated in the western and eastern part of the investigation area. In the western part, magnetotelluric soundings were conducted on six lines perpendicular to the major orogen axis and two parallel to it. The measurements were made with the MT-1 system over a frequency range 300-0.0005 Hz. 1D automatic inversion with the use of Bostick, Occam and LSQ algorithms was employed in the quantitative interpretation. 2D resistivity sections were obtained based on results of automatic LSQ inversion. Results of 2D RRI inversion, geological and borehole data, and reflection seismic data were also applied. As a result of interpretation, resistivity sections and maps of high-resistivity horizons related with the top of the Meso-Paleozoic and Precambrian basement were obtained.