Structure and evolution of the Carpathian thrust front between Tarnów and Pilzno (Pogórska Wola area, southern Poland) – results of integrated analysis of seismic and borehole data

Abstract

Seis mic data and core from the shal low car to graphic Pilzno P-7 bore hole were used to con struct a new model of the Carpathian orogenic front be tween Tarnów and Pilzno, in the Pogórska Wola area (south ern Po land). The most ex ter nal, fron tal thrust of the orogenic wedge (the Jaoeniny struc ture) was iden ti fied as a syn-depositional fault-prop a ga tion fold detached above the Up per Badenian evaporites. Its for ma tion was con trolled by the pres ence of me chan i cally weak foredeep evaporites and by the mor phol ogy of the sub-Mio cene Meso-Pa leo zoic fore land plate (Jaoeniny and Pogórska Wola palaeovalleys). The fron tal zone of the Carpathian orogenic wedge (the Skole thrust sheet and the de formed foredeep depos its of the Zg³obice thrust sheet) is char ac ter ized by sig nif i cant backthrusting of the foredeep suc ces sion to wards the south, and by the pres ence of a tri an gle zone, with strongly de formed Up per Badenian evaporites of the Wieliczka For ma tion in its core. The tri an gle zone was formed dur ing the lat est thrust ing move ments of the Carpathians. An in di ca tion of the ex istence of the tri an gle zone in the vi cin ity of Dêbica has also been pro vided by re in ter pre ta tion of the ar chive re gional geo log ical cross-sec tion. The youn gest foredeep de pos its, brought to the sur face above the backthrust, have been dated as Sarmatian (NN7 nannoplankton zone), which in di cates that the lat est thrust move ments within the fron tal Carpathian orogenic in the vi cin ity of Tarnów-Dêbica took place approx. 11-10 mil lion years ago. Thermochronological stud ies (AFT and AHe) in di cated that the foredeep suc ces sion drilled by the Pilzno P-7 bore hole has not been bur ied deeper than 1.5-2 km, which is com pat i ble with re con struc tion based on the seis mic data.

Petroleum Provinces of the Paratethyan Region

“…(Summary after ten Haven et al, 1993;Lafargue et al, 1994;Kotarba and Koltun, 2006;Matyasik and Dziadzio, 2006;Oszczypko et al, 2006;Pawlewicz, 2006;Slaczka et al, 2006;Krobicki et al, 2012;Kotarba et al, 2013;Slaczka et al, 2014;Krzywiec et al, 2014;Machowski et al, 2017;Waskowska et al,2018;Kosakowski et al,2018 this issue)…”

Exhumation history of the Tatry Mountains, Western Carpathians, constrained by low‐temperature thermochronology

“…Thrusting was accompanied by the formation of the Carpathian foredeep basin [ Oszczypko , ]. In the sector of the Outer Carpathian belt located to the north of the Tatry, the main thrusting phase ceased after ~13.6 Ma [ Nemčok et al ., , ] and the final stages of tectonic activity within the frontal orogenic wedge took place after ~12 Ma [ Krzywiec et al ., ].…”

Structure and tectonic evolution of the NE segment of the Polish-Ukrainian Carpathians during the Late Cenozoic: subsurface cross-sections and palinspastic models

“…In the southern segment of the seismic time section ( fig. 10 in Krzywiec et al 2014) -with the course similar to that of the cross section from our Fig. 6A -the quoted authors plotted (with a question mark) a backthrust that suggested a tectonic character of the unconformable position of the Miocene sediments on the Skole Nappe.…”

“…For the remaining symbols, see • a parautochthonous Miocene fold (at the front of the Skole Nappe overthrust), thrust over the autochthonous deposits of the Carpathian Foredeep (the PW-3 well) with the thrust amplitude on the order of 1 km; • the subhorizontal autochthon, somewhat tectonically disturbed at depth (the PW-5 well), with basal lower Badenian deposits overlying (with a stratigraphic gap) the Upper Cretaceous marls (the ŁG-1 well). Krzywiec et al (2014) presented an alternative interpretation of the geological structure of the thrust front in the Pogórska Wola area (Fig. 1, cross section A), based on interpretation of a seismic 3D survey.…”