Wyniki wyszukiwania - BazTech

1

New insights into the glacial history of southwestern Poland based on large-scale glaciotectonic deformations : a case study from the Czaple II Gravel Pit (Western Sudetes)

Kowalski A., Makoś M., Pitura M.

Annales Societatis Geologorum Poloniae

|

2018

|

Vol. 88, No. 4

341--359

EN

This paper presents the results of structural and sedimentological studies carried out in the outcrops of Quaternary (Middle Pleistocene) deposits near the village of Czaple in Lower Silesia, Western Sudetes. Fluvial sands, gravels and glacial tills traditionally assigned to the Middle Polish Pleistocene Glaciations (Odranian Glaciation) crop out in the active gravel pit Czaple II. In these deposits, the authors have recognised and documented numerous mesoscale glaciotectonic deformation structures that were previously undescribed from the mountainous part of the Sudetes. These structures represent effects of sediment deformation in both proglacial and subglacial settings, and include such features as asymmetrical and disharmonic folds, thrusts, steeply inclined reverse faults, normal faults and conjugate sets of fractures. Based on the orientation of kinematic indicators associated with the faults and fracture planes (slickensides, hackles, grooves, R-shears) within the fine-grained sediments and in sands and gravels, an S- and SE-directed horizontal compression due to ice-sheet advance is postulated. This direction is consistent with some relevant other data from the Sudetes, indicating that the Odranian ice sheet advanced into the area of the Sudetes from the north, north-east and north-west.

2

Analiza strukturalno-kinematyczna kompleksu deformacji glacitektonicznych w strefie rowu Kleczewa (elewacja konińska, wschodnia wielkopolska)

Włodarski W.

Prace Państwowego Instytutu Geologicznego

|

2009

|

T. 194

75--100

PL

Przedmiotem artykułu jest analiza strukturalno-kinematyczna kompleksu deformacji glacitektonicznych, wyodrębniającego się jako osobne piętro strukturalne w strefie rowu Kleczewa (elewacja konińska). Analiza makrostrukturalna pozwoliła zdefiniować trzy podjednostki strukturalne A, B i C. Analiza strukturalno-kinematyczna mezostruktur wykazała znaczące różnice w rozwoju strukturalnym poszczególnych podjednostek. Podjednostkę strukturalną A reprezentują głównie fałdy i nasunięcia, rozwijające się w polu kompresji horyzontalnej przed czołem nasuwającego się lądolodu zlodowacenia Odry. Deformacjom podlegały głównie osady starsze od zlodowacenia Odry, tj. iły formacji poznańskiej miocenu górnego, węgle brunatne formacji poznańskiej miocenu środkowego a podrzędnie gliny T1 zlodowacenia południowopolskiego. Niewielki udział w deformacjach miały dolne partie serii glacifluwialnej z Jóźwina z fazy anaglacjalnej zlodowacenia Odry. Podjednostka strukturalna B obejmuje wyższe partie serii glacifluwialnej z Jóźwina, które przykrywają, a miejscami rozcinają erozyjnie, struktury podjednostki A. Osady podjednostki B są pocięte uskokami normalnymi powstałymi w efekcie pionowych przemieszczeń podścielających je struktur podjednostki A. Podjednostka strukturalna C jest reprezentowana głównie przez struktury wskazujące na ścinanie proste w płaszczyźnie (sub)horyzontalnej w warunkach subglacjalnych. Obejmuje ona glinę T2 zlodowacenia Odry oraz strefy kontaktu z podłożem. Pod względem mezostrukturalnym glina T2 reprezentuje melanż typu block in matrix. Podrzędną rolę w rozwoju strukturalnym podjednostki C odgrywała ekstensja horyzontalna w efekcie aktywizacji makrostruktur podłoża w trakcie rozpadu lądolodu zlodowacenia Odry.

EN

The complex of glaciotectonic deformations within Kleczew graben zone (Konin Elevation) is the object of present study. The analysis of macrostructures was the basis for definition of three structural sub-units A, B and C. Mesostructures were studied in detail within each of these sub-units. The structural sub-unit A is mainly represented by folds and thrusts produced by horizontal compression in front of advanced Odranian ice-sheet. These structures developed mainly within the Upper Miocene Poznań Formation clays, the Middle Miocene Poznań Formation brown coals and the South Polish glacial tills. The structural sub-unit B is composed of the glaciofluvial series from Jóźwin of the Odranian Glaciation, which cover discordantly deformed sediments of the sub-unit A. The sediments of the sub-unit B are dissected by lot of normal faults and high angle reverse faults. These structures were produced by horizontal extension related to vertical uplift of structures of sub-unit A. The structural sub-unit C is represented mainly by glacial till T2 of the Odranian Glaciation and contact zone between this till and the older sediments. The style of deformation of these sediments shows (sub)horizontal simple shearing under subglacial conditions. Within the complex of glaciotectonic deformations, the horizontal extension was the youngest deformation event produced by vertical uplift of the basement during decaying of the Odranian ice-sheet.

3

Budowa geologiczna i glacitektonika klifu orłowskiego w Gdyni

Kaulbarsz D.

Przegląd Geologiczny

|

2005

|

Vol. 53, nr 7

572--581

EN

The Orłowo Cliff is built of glacial and fluvioglacial deposits, Middle Polish Glaciations (possibly Odranian and Warthanian) and Vistulian Glaciation. Deposits are heavily deformed glaciotectonically. In the northern part of the cliff, Miocene sediments are exposed. It is possible, that the Miocene sediments were dislo-cated from their primary position. There were observed overthrusts and intermingling with Pleistocene material in the lower part of the exposure. The Orłowo Headland is built of glacial tills. It is probably a part of fold, similar in pattern to the structure of overthrust folds present in silty-sandy-grained deposits in the southern part of the cliff. Apart from folds and overthrusts there are many faults and the boudinage. Structural analysis of glaciotectonic deformations in conjunction with origin of deposits and statigraphic research enabled the recognition of several stages of development of deformations. Two local directions of glaciotectonic transport were marked clearly: from the north-east, which was connected with glacier invasion in the OEwiecie Stadial of the Vistulian Glaciation, and direction from north-west (north north-west), related to the Main Stadial of the Vistulian Glaciation.