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    Wyświetlanie 1-3 z 3
    Tytuł:
    Geomorphological classification and landforms inventory of the middle-atlas volcanic province (morocco): scientific value and educational potential
    Autorzy:
    Amine, Abdelmounji
    El Amrani El Hassani, Iz-Eddine
    Remmal, Toufik
    El Kamel, Fouad
    Van Wyk de Vries, Benjamin
    Boivin, Pierre
    Powiązania:
    https://bibliotekanauki.pl/articles/1051037.pdf
    Data publikacji:
    2019-03-31
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    volcanic geomorphology
    eruptive dynamic styles
    volcanoes
    lava flows
    Middle-Atlas volcanic province
    Opis:
    Through the tabular morphology of northwestern part of the Middle-Atlas in Morocco, numerous uncovered monogenetic volcanoes arise structured of pyroclastic product layers and lava flows. Our fieldwork results witness a wide-ranging volcanic shape spectrum, as cones, maars, tuff-rings, and cone-maar mixes, generally associated with a later lava flow discharge that could develop many surfaces and appearances. There are withal sundry eruptive products such as pahoehoe lava, scoria, tuff, lapilli, peperites, base-surges, bombs, etc. This monogenetic volcanic field of practically 1000 km2 offers remarkable eruptive landforms, referred to as the largest, and the youngest volcanic field in Morocco, which consists of a large area within the Ifrane National Park. This fieldwork study provides a renewed volcanic geomorphological classification table and GIS data to be used by a wide public range for both educational and geo-touristic interest and access effectively to such a high-mountain natural museum. In the event that these volcanic structures were appropriately dealt with, the high educational scientific content and the notable touristic vocation would almost certainly create business openings and new financial wages for neighborhood populaces. This work focuses to share our outcomes and emphases the scientific value about the monogenetic volcanic field around the tabular Middle-Atlas in Morocco.
    Źródło:
    Quaestiones Geographicae; 2019, 38, 1; 107-129
    0137-477X
    2081-6383
    Pojawia się w:
    Quaestiones Geographicae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stephanian-Early Permian basaltic trachyandesites from the Sławków and Nieporaz-Brodła Grabens near Kraków, Southern Poland
    Autorzy:
    Lewandowska, A.
    Rospondek, M. J.
    Nawrocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/191897.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Geologiczne
    Tematy:
    Upper Carboniferous/Permian volcanism
    a-a lava flows
    autoclastic breccias
    basaltic trachyande-sites
    transitional calc-alkaline to alkaline rocks
    hydrous magma
    Opis:
    In the Kraków-Lubliniec section of the major Hamburg-Kraków-Dobrogea Fault Zone (HKDFZ), the Stephanian-Early Permian magmatic activity was simultaneous with subsidence/uplift of formed blocks. In the proximity of the uplifted areas the sedimentation started with fanglomerates, distally passing into playa siltstone and was accompanied by volcanism. In the Nieporaz-Brodła graben, basaltic trachyandesite a-a lava flows with autoclastic breccias reach ca. 150 m in thickness. The weathering recorded as adhesive rims around breccia clasts reflects palaeosoil formation during quiescence periods between the eruptions. The eruptions were effusive although scoriaceous lava indicates high volatile content of the magma. The water content before eruption had to be over 2 wt. percent. Only then the crystallisation model predicts accurately the type, composition and order of the crystallising phases. Thus, the basaltic trachyandesite magma originated from a source containing hydrous phase (i.e., amphibole or phlogopite). All the studied basaltic trachyandesites had fayalitic olivine on their liquidus reflecting the crystallisation stage in a magma chamber at crustal depths. During final decompression on the magma ascent due to water exsolution, the olivine was followed by plagioclase, spinel, augite, ilmenite, apatite, K-feldspar and residual high-K rhyolitic glass. The high potassium content of these volcanics was thus a primary feature reflecting the source geochemistry and differentiation trend, and its consequence was potassium metaso- matism. Due to water exsolution the glass was altered, however, homogenous interstitial glass survived in some rocks. The glass is strongly enriched in incompatible trace elements, showing that it is a highly fractionated residual melt fraction of the basaltic trachyandesite magma. Thus, the glass geochemistry reflects the trend of fractional crystallisation indicating that co-occurring K-rich felsic rocks were not derived from the same magma. All the basaltic trachyandesites studied have calc-alkaline to alkaline affinity. They contain fayalitic olivine and are low in MgO <5 wt. %, Cr and Ni, the features characteristic for evolved magmas. They show significant negative Sr/Sr*> 0.5-0.80 and small Eu/Eu* > 0.9-1.0 anomalies suggesting fractionation of plagioclase. The Eu/Eu* anomaly is probably compensated by amphibole retaining in the source. Negative Nb, Ti anomalies suggest Fe-Ti oxide fractionation characteristic for calc-alkaline evolution trend. A significant enrichment in LREE relatively to HREE (La/Yb > 10) indicates subduction-related metasomatism. However, the described tectonic context is inconsistent with subduction related characteristics. Concluding, the observed geochemical characteristics indicate remarkable role of water in magma evolution. The volcanism was related to strike-slip dextral movement along the Kraków-Lubliniec section of HKDFZ, transformed into crustal extension and subsidence, the features typical for the formation of pull-apart basins, in the late stages of the Variscan orogen evolution.
    Źródło:
    Annales Societatis Geologorum Poloniae; 2010, 80, No 3; 227-251
    0208-9068
    Pojawia się w:
    Annales Societatis Geologorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atrakcje geoturystyczne grupy wulkanów Kluczewskiej Sopki, północna Kamczatka, Rosja
    Geotouristic attractions of the Klyuchevskoy group volcanoes, North Kamchatka, Russia
    Autorzy:
    Łodziński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/344541.pdf
    Data publikacji:
    2010
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Stowarzyszenie Naukowe im. Stanisława Staszica
    Tematy:
    Kamczatka
    wulkany: Kluczewski, Płaski, Kamień, Bezimienny, Zimina, Wielka Udina, Tołbaczik
    stratowulkany
    kopuły ekstruzywne
    Kamchatka
    volcanoes: Klyuchevskoy, Krestovsky, Ushkovsky, Kamen, Bezymyanny, Zimina, Bolshaya Udina, Tolbachik
    stratovolcanoes
    shield volcanoes
    extrusive domes
    lava flows
    Opis:
    Artykuł przedstawia walory geoturystyczne grupy wulkanów Kluczewskiej Sopki na Północnej Kamczatce. Pokazano położenie półwyspu Kamczackiego na tle aktualnych granic płyt litosferycznych oraz wyjaśniono genezę i budowę tzw. Korjacko-Kamczackiego pasa wulkanicznego. Geotektoniczne położenie Kamczatki w strefie "okołopacyficznego pierścienia ognia" umożliwia zapoznanie się na tym obszarze z przejawami współczesnego wulkanizmu (wulkany tarczowe, stratowulkany, kopuły ekstruzywne, kaldery, pokrywy ignimbrytowe, potoki błotne (lahary), ekshalacje gazów i par, czy wykwity siarkowe). Obok działalności wulkanicznej o niezwykłej atrakcyjności geoturystycznej tego obszaru decyduje urozmaicona rzeźba górska, modelowana przez lodowce górskie, procesy wietrzenne i erozję rzeczną.
    The paper describes the geotouristic valours of the Klyuchevskaya group of volcanoes in the Northern Kamchatka. The relationships are presented between the Kamchatka and the recent boundaries of crustal plates, then the genesis and the structure are explained of the Koryak-Kamchatka volcanic belt. The geotectonic position of Kamchatka as a part of the "Circumpacific Ring of Fire" enables us to recognize the manifestations of the recent volcanism (shield volcanoes, stratovolcanoes, lava domes, calderas, ignimbrites, lahars, gas and vapour exhalations, native sulphur encrustations). Apart from volcanic activity, the exceptional tourist value of the Northern Kamchatka is the high- mountain relief shaped by glaciers, weathering and river erosion.
    Źródło:
    Geoturystyka; 2010, 1; 51-63
    1731-0830
    Pojawia się w:
    Geoturystyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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