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Wyświetlanie 1-10 z 46
Autorzy:
Uchman, Alfred
Opis:
Ichnological research on trace fossils from the volcanic islands of Macaronesia (North Atlantic) is reviewed in light of significant advances over the past two decades. These studies contribute to the interpretation of paleoenvironments and enhance our understanding of the biota preserved in Miocene–Holocene shallow marine and non-marine deposits across the Azores, Cape Verde, Canary, Madeira, and Salvagens archipelagos. Trace fossils provide evidence of organisms not always known from body fossils, or whose potential tracemakers are absent from the extant island fauna. They include sedimentary burrows, borings in hard substrates, and traces of plant–insect interactions. Some ichnotaxa are widespread and common (e.g., Bichordites monastiriensis, Dactyloidites ottoi, Macaronichnus segregatis, Ophiomorpha nodosa, Thalassinoides isp.), whereas others are rare. Several new ichnotaxa have also been described from the islands, including Alaichnus kabuverdiensis (cumulative trace of bivalve siphons), Centrichnus dentatus (attachment trace of verrucid barnacles), Diopatrichnus santamariaensis (polychaete tubes armored with shell debris), Ericichnus bromleyi and E. asgaardi (bioerosion grooves of regular echinoids), and Rebuffoichnus guanche (coleopteran pupation chambers). Despite these advances, ichnological research in Macaronesia remains uneven, with many topics still underexplored and significant gaps in the geographic and inventory record.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Overview of magmatism in Northwestern Vietnam
Autorzy:
Khuong, H.
Tematy:
Vietnam
plate tectonics
magmatism
Palaeozoic
Mesozoic
Cenozoic
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Wydawca:
Polskie Towarzystwo Geologiczne
Powiązania:
https://bibliotekanauki.pl/articles/191922.pdf  Link otwiera się w nowym oknie
Opis:
Amalgamation of tectonic plates of Southeast Asia occurred in northwestern Vietnam. Six groups of magmatic rocks are related to the tectonic events. The first group corresponds to the major episodes of crustal formation in the South China block, or is linked with the formation of Gondwana. The second group includes granitoids in connection with the collision and formation of the Caledonian-Hercynian folding event. The third group contains Upper Permian ophiolites, as well as the Permian extrusives, formed in intraplate setting, related to back-arcs spreading. The fourth group is related to Triassic Indosinian orogeny, the fifth group comprises Jurassic-Cretaceous intraplate granitoids. Finally, during Cenozoic times, magmatic rocks were represented by alkaline granitoids - the effect of strike-slip faulting related to the collision of India and Eurasia plates.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cenozoic dynamic evolution of the Polish Platform
Autorzy:
Jarosiński, M.
Porawa, P.
Ziegler, P. A.
Tematy:
Carpathians
foreland plate
Cenozoic
geodynamics
stress field
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Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059122.pdf  Link otwiera się w nowym oknie
Opis:
The Cenozoic tectonic evolution of the Polish Platform reflects repeated changes in loading conditions at the Alpine–Carpathian and Arctic–North Atlantic margins of the European continent. After the Late Creta ceous–Paleocene main phase of the Mid-Polish Basinin - version, a second phase of limited uplift of the Mid-Polish Swell occurred during the Middle–Late Eocene. End Eocene and Early Oligocene subsidence of narrow grabens on the Fore-Sudetic Monocline was coeval with normal faulting in the East Alpine foredeep basin and the development of the Central European rift system. At the same time the Outer Carpathian flysch basins were rearranged, presumably in response to the build-up of compressional stresses at crustal levels, whilst subsidence and erosion patterns changed in the Carpathian Foreland from being dominated by the NW–SE trending Mid-Polish Swell to being controlled by the development of the W–E trending Meta-Carpathian Swell. At the end of the Oligocene the Fore-Sudetic graben system propagated into the area of the Trans-European Suture Zone and the Sudetes and remained active during the Early and Middle Miocene. This was paralleled by intensified subduction activity and thrusting of the Carpathians and the development of their flexural foredeep basin. A short early Sarmatian episode of basement in volving transpression along the SW margin of the Mid-Polish Swell correlates with the termination of north-directed nappe transport in the Outer Carpathians. This was followed by eastward migration of the subsidence centre of the Carpathian Foredeep Basin and the gradual termination of tectonic activity in the grabens of the Polish Lowlands. After a period of post-orogenic relaxation the present-day compressional stress regime built up during the Pliocene and Quaternary. Intensified ridge push forces exerted on the Arctic–North Atlantic passive margins contribute to this compressional stress field that is dominated by collision-related stresses reflecting continued indentation of the Adriatic Block. This sequence of events is interpreted in terms of changing tectonic loads in the Carpathians, Alps and at the NW passive margin of Europe. The complex and diachronous interaction of mechanically coupled and uncoupled plates along collision zones probably underlies the temporally varying response of the Carpathian Foreland that in addition was complicated by the heterogeneous structure of its lithosphere. Progressively increasing ridge push on the passive margin played a secondary role in the stress differentiation of the study area.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ascending speleogenesis of Sokola Hill : a step towards a speleogenetic model of the Polish Jura
Autorzy:
Gradziński, Michał
Hercman, Helena
Pura, Dominik
Urban, Jan
Kicińska, Ditta
Opis:
The paper deals with the origin of caves in Sokola Hill (Polish Jura). The caves abound ill solution cavities hi the walls and ceilings, many of them arranged hierarchically, some others arranged in rising sets. Blind chimneys and ceiling half-tubes are also present. These features collectively indicate that the caves originated under plireatic conditions by an ascending flow of water, probably of elevated temperature. Plireatic calcite spar, crystallized from water of elevated temperature, lines the cave walls. During the formation of die caves the Jurassic limestone aquifer was confined by impermeable cover. Three possible scenarios for the origin of the caves are suggested. The first scenario points to formation of the caves during the Palaeogene prior to the removal of the confining Cretaceous marls. The second connects the origin of the caves with regional palaeoflow driven by tectonic loading by Carpathian nappes to the south, while die diird refers to local topographically driven palaeoflow. Bodi die second and diird scenarios assume diat die Polish Jura had a cover of Miocene impermeable elastics. All die scenarios account for die origin of die caves in Sokola Hill and explain die common occurrence of ascending caves throughout die Polish Jura. hi die subsequent stages of evolution die caves were partly filled widi various deposits. Conglomerates composed of Jurassic limestone clasts, quartz sands and sandstones are preserved as erosional remnants, locally covered by or interfmgered widi calcite flowstones. The clastic deposits were laid down by surface streams diat invaded die caves earlier dian 1.2 Ma. The caves were not invaded by water from Pleistocene glaciers, which is proved by die assemblage of heavy minerals in die cave elastics.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Reconstructing an eroded scoria cone : the Miocene Soonica Hill volcano (Lower Silesia, SW Poland)
Autorzy:
Awdankiewicz, M.
Tematy:
Lower Silesia
Cenozoic
scoria cone
lava
intrusion
basalt
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Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Powiązania:
https://bibliotekanauki.pl/articles/2059700.pdf  Link otwiera się w nowym oknie
Opis:
The basaltic rocks of Sośnica Hill near Targowica (Fore-Sudetic Block) belong to the Cenozoic Central European Volcanic Province. The volcanic succession at Sośnica is over 40 m thick and comprises pyroclastic fall deposits (mainly tuff breccias), subvolcanic intrusions (plug, dykes and other intrusive sheets) and aa-type lavas. Field relationships and structural data enable a detailed reconstruction of the vent location, morphology and eruptive history of the original volcano. Initial Hawaiian to Strombolian-type explosive eruptions produced a pyroclastic cone. Subsequently subvolcanic intrusions and lavas were emplaced. The lavas were fed from the central vent of the volcano, breached the cone and flowed southwards. Later eruptions resumed at a new vent on the western slopes of themain cone. The final volcanic edifice-a breached Strombolian scoria cone with a lava flow and a parasitic cone-was 500-1000 m in diameter at the base and 90-180mhigh. The preserved SWsector of this volcano, where the pyroclastic deposits were protected from erosion by the surrounding plugs and lavas, corresponds to ca. 1/2 of the height and 1/8 of the volume of the original volcano. Compared with many other remnants of Cenozoic volcanic centres in Lower Silesia, this volcano is exceptionally well preserved and exposed.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 46

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