Browsing by Subject "Neogene"

Now showing 1 - 6 of 6

Access status: Open Access ,
Continuous contractional deformation followed by extension in the Nowy Sącz Basin, Polish Outer Carpathians: constraints from fault-slip analysis
(Wydawnictwa AGH, 2025) Fodor, László; Świerczewska, Anna; Strzelecki, Piotr Jan
Fault-slip analysis was carried out in the Nowy Sącz Basin and the surroundings of the Polish Outer Carpathians based on field observations, published maps, and publications. A reconstruction of the stress field and the contractional directions from the folds suggests that the area was marked by four different deformation phases, most of them involving several stress states. The tilt test supports the separation of pre-, syn-, and post-folding deformation episodes within the phases which occurred during the folding of the Palaeogene to Early Miocene flysch units and also during the folding of the late Middle Miocene basin fill. After an early extensional phase at the onset of the deformation history, the area was marked by contractional deformation from ~34 Ma to ~8 Ma. During this period the compressional direction did not change markedly but a slight clockwise change of the maximal stress axis may have occurred in the Early Miocene due to vertical-axis block rotation. In this persistent deformation field, the basin could have had a contractional origin in front of an out-of-sequence thrust. The latest Miocene(?) to Quaternary deformation was probably related to the extensional collapse of the Carpathian accretionary wedge.
Access status: Open Access ,
Czwartorzędowa ewolucja Doliny i Kanionu Colca - raport z badań geomorfologicznych wykonanych w roku 2006
(Wydawnictwa AGH, 2008) Kalicki, Tomasz; Kukulak, Józef
Geomorphological mapping was carried out in Colca Valley between Chivay and Madrigal (section of 30 km length) and in Colca Canyon upstream of Canco (three cross sections). Both the valley and the canyon are conditioned by tectonic structures. Three sections with different morphology and processes modelling bottom and sides of the valley could be distinguished in the Colca Valley. A water-course was periodically obstructed by landslides (Colca Valley) or lava flows (Colca Canyon) and dam lakes occurred. The recent Colca Valley is a result of the Middle Pleistocene capture of endorheic system of intermountain grabens by a river which belongs to the Pacific Ocean drainage basin. Lake filling by volcanic ashes occurred in these grabens in the end of Pliocene and the beginning of Quater-nary. Capture happened in tectonically determined place on downthrow at block and fracture line. A lack of rejuvenation of longitudinal profile of the Colca Valley can result from young age of capture, neotectonic movements and also river overloading by colluvia directly upstream of the capture place.
Access status: Open Access ,
Lithofacies and depositional environments of the Paleogene/Neogene sediments in the Hoanh Bo Basin (Quang Ninh province, NE Vietnam)
(Wydawnictwa AGH, 2015) Tha, Hoang Van; Wysocka, Anna; Pha, Phan Dong; Nguyẽ̂n, Quó̂c Cường; Ziółkowski, Piotr
The Hoanh Bo Basin is a multiple period formed basin which is associated with the tectonic mechanism due to the activity of the Chi Linh-Hon Gai and Trung Luong Faults during the late Paleogene – early Neogene time. The basin is filled with continental sediments, comprising mainly polymictic conglomerates, sandstones, siltstones, claystones and shales. Coarser-grained polymictic deposits predominate along the northern and western margins of the basin, while different types of siltstones, claystones, even sandstones occur in its center, as well as along its southern and eastern parts toward the Ha Long Bay. The source rocks for sedimentary materials are mainly originated from rocks of the Hon Gai and Ha Coi Formations. Based on the dominant grain-size class, texture, stratification, degree of clast rounding and sorting, 17 lithofacies were determined in the Hoanh Bo Basin infill. The basin is filled by gravelly, sandy and fine-grained lithofacies just covers a modest area but it represents a full of succession of 4 depositional systems including alluvial fan, fluvial, deltaic and lacustrine environments. Alluvial fan and fluvial environments are characterized by an assemblage of lithofacies such as sand- and mud-supported disorganized breccias (Gb), clast- to sand-supported conglomerates (Gmm), clast-supported inverse-graded conglomerates (Gig), planar-cross-bedded conglomerates (Gp), trough cross-bedded conglomerates (Gt), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), trough cross-bedded sandstones (St), ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), massive sandstones (Sm), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C), the deltaic assemblage is dominated by planar-cross-bedded conglomerates (Gp), horizontally stratified conglomerates (Gh), planar cross-bedded sandstones (Sp), horizontally bedded sandstones (Sh), low-angle cross-bedded sandstones (Sl), while the lacustrine assemblage consists of ripple cross-laminated sandstones (Sr), horizontally bedded sandstones (Sh), normally graded sandstones (Sng), massive mudstones, siltstones (Fsm), laminated siltstones and mudstones (Fl), massive claystones (Fm) and coaly lithofacies (C).
Access status: Open Access ,
New data on burial and exhumation within Orava-Nowy Targ Intramontane Basin (Western Carpathians): results of vitrinite reflectance studies
(Wydawnictwa AGH, 2014) Waliczek, Marta; Solecki, Marek
The aim of the study was to determine the maturity of organic matter in the Neogene sediments of the Orava-Nowy Targ Intramontane Basin and to estimate, according to vitrinite reflectance (Ro), maximum paleotemperatures affecting studied sediments.
Access status: Open Access ,
Sedimentary petrology characteristics and their implications for provenance of Hoanh Bo Basin Neogene system in Quang Ninh province, north-eastern Vietnam
(Wydawnictwa AGH, 2017) Tha, Hoang Van; Wysocka, Anna; Nguyẽ̂n, Quó̂c Cường; Pha, Phan Dong; Ziółkowski, Piotr
The Hoanh Bo Basin has developed over multiple periods since the Miocene period in association with the tectonic activity of the Chi Linh-Hon Gai and Trung Luong Faults. The basin is filled with Neogene continental sediments, comprising mainly polymictic conglomerates, sandstones, siltstones, claystones, and shales. Coarser-grained polymictic deposits predominate along the northern and western margins of the basin, whereas different types of siltstones, claystones, and sandstones occur in its centre, as well as along its southern and eastern parts, toward the Ha Long Bay. The conglomerates and sandstones are composed mainly of quartz and sedimentary rock fragments, and a small amount of mica. Cement is mainly built of iron-oxide, clay or carbonate mud. The source area for the Hoanh Bo Basin sediments was located in the close vicinity of the basin. It was built of strongly weathered rocks of the Hon Gai, Ha Coi, Cat Ba Formations.
Access status: Open Access ,
Stratygrafia polskich Karpat fliszowych pomiędzy Bielskiem-Białą a Nowym Targiem
(Wydawnictwa AGH, 2007) Golonka, Jan; Waśkowska, Anna
Jurassic, Cretaceous, Paleogene, and Neogene allochtonous rocks of the Outer Carpathians build up the complex area between Bielsko-Biała and Nowy Targ. These deposits belong recently to the Magura, Fore-Magura, Silesian, Sub-Silesian and Skole Nappes. The present authors provided the systematic arrangement of the lithostratigraphic units according to their occurrence within the original basins and other sedimentary areas. The Magura Basin was formed in the Middle Jurassic. The deep--water sedimentation of radiolarites and carbonates dominated at the beginning, since the Late Cretaceous the flysch sedimentation prevailed. The proto-Silesian Basin developed during Late Jurassic and Early Cretaceous times with the syn-rift and post-rift formations. The Silesian, Fore-Magura, Skole Basins formed during Late Cretaceous. Fore-Silesian sedimentary area included the western end of the Sub-Silesian Ridge and slopes of the Silesian and Skole Basins. The western end of the Skole Basin is located within the investigated area. The slope deposits of the Sub-Silesian type and separated basinal flysch facies occurred there. The basins existed during Late Eocene to Early Miocene times: the remnant piggy-back Magura Basin and, in the northern part of the accretionary prism the Krosno Basin with Menilite and Krosno Formations.