Fault geometry and evidence of depocentre migration within a transtensional intra-basinal high – a case study from the Łączna Anticline (Intrasudetic Synclinorium, SW Poland)

Abstract

1 Uni ver sity of Wroc³aw, In sti tute of Geo log i cal Sci ences, De part ment of Struc tural Ge ol ogy and Geo log i cal Map ping, pl. M. Borna 9, 50-204 Wroc³aw, Po land Kowalski, A., 2017. Fault ge om e try and ev i dence of depocentre mi gra tion within a transtensional intra-basinal high -a case study from the £¹czna Anticline (Intrasudetic Synclinorium, SW Po land). Geo log i cal Quar terly, 61 (4): 779-794, doi: 10.7306/gq.1372The pa per pres ents the re sults of geo log i cal map ping and a de tailed struc tural anal y sis car ried out in the £¹czna Anticline.This el e vated re gion co in cides with the Zawory (Cz. Závora) moun tain range in the Cen tral Sudetes (SW Po land). The £¹czna Anticline sep a rates two mi nor geo log i cal units (de pres sions) within the north west ern part of the Intrasudetic Synclinorium -the Krzeszów and the Po lice brachysynclines. In nu mer ous ex po sures of Tri as sic and Up per Cre ta ceous sed i men tary rocks, sev eral brit tle and a few soft-sed i ment de for ma tion struc tures have been rec og nized. Their ori en ta tion and spa tial dis tri bu tion sug gest that the £¹czna Anticline is a horst-like, intra-basinal high, formed due to per ma nent ex tension, dextral strike-slip move ments within fault zones, and neg a tive flower struc tures. The stud ies did not con firm the oc currence of con tin u ous de for ma tions such as an ti cli nal bends and flex ures. The re sults show that the pres er va tion of some lithological va ri et ies of sed i men tary rocks within mod ern mor pho log i cal and struc tural el e va tions re flects the mi gra tion of cen tres of max i mum sub si dence within a pull-apart ba sin sys tem. A new struc tural and geodynamic in ter pre ta tion for the £¹czna Anticline area is pro posed.

Paleostress reconstruction of faults recorded in the Niedźwiedzia Cave (Sudetes): insights into Alpine intraplate tectonic of NE Bohemian Massif

“…Hence, at a minimum, strike-slip faults observed within Cretaceous Bohemian Basin formations should be associated with Late Cretaceous (Subhercynian)-Paleogene tectonic activity. This argument is congruent with field observations from the Sudetes Cretaceous basins, where strike-slip faults are commonly reported and interpreted as a result of general horizontal contraction (e.g., Don and Gotowała 2008;Nováková 2014), locally, as an exception to the rule, replaced by transtensional stresses (Kowalski 2017). Consequently, paleostress population P2 (σ1 ~ 240º) may reflect a record of a Late Cretaceous-Middle Eocene compressional stress field identified as indicative in the case of, e.g., the origin of the Elbe Fault System in the NW Bohemian Massif (Adamovič and Coubal 1999;Coubal et al 2015) and graben structures formation in the North Sudetic Basin (Kowalski 2020).…”

Monitoring of anthropogenic landslide activity with combined UAV and Lidar-derived DEMS a case study of the Czerwony wawoz landslide (SW Poland. Western Sudetes)

“…Numerous, so far unknown landslide forms were recognized and described in the last 10 years in the Sudetes, e.g. from the Kamienne (Synowiec, 2003;Migoń et al, 2016), Bardzkie (Sikora et al, 2016b), Bystrzyckie (Gotowała et al, 2015;Różycka et al, 2015), Stołowe (Migoń and Kasprzak, 2011) and Kaczawskie Mountains (Kowalski and Wojewoda 2017), Kaczawskie Foothills (Maciejak et al, 2017), Izerskie Foothills (Kowalski, 2017a) and Zawory Range (Kowalski, 2017b).…”