Podrobnosti záznamu

Název
    Dead Sea Region: Fault-Controlled Chemistry of Cenozoic Volcanics
Údaj o odpovědnosti
    Ferry Fediuk, Al fugha
Další názvy
    Magmatism and Rift Basin Evolution (Variant.)
Autor
    Al fugha, Hassan
    Fediuk, František, 1929-
Jazyk
    anglicky
Zdrojový dokument - seriál
    Geolines
Svazek/č.
    Vol. 9
Strany
    p. 29-34
Rok
    1999
Poznámky
    6 obr., 2 s.bibl.
Předmětová skupina
    bazalt
    chemismus hornin
    kenozoikum
    kontrola tektonická
    petrogeneze
    vzácné zeminy
    zóna riftová
Geografické jméno
    Jordánsko
    Saudská Arabie
    Sýrie
Klíčové slovo
    Cenozoic
    Chemistry
    Dead
    Fault-Controlled
    Region
    Sea
    Volcanics
Abstrakt (anglicky)
   The 800 km long geosuture of the Dead Sea, particularly active in the Cenozoic time and representing the northern-most promontory of the Afro-Arabian rift system, shows intimate relations between tectonic and volcanic activities. The N-S striking rift was accompanied here not only by substantial horizontal sinistral displacement but also by sinistral fan-like rotation of Arabian plate opening ways for the ascent of magmas. In Jordan, these magmas fluctuate within the range of basaltic rocks only, including mostly alkali olivine basalts, basanites and less frequently olivine nephelinites. Nevertheless, systematic changes in the bulk rock chemistry with the position relative to the rift graben are obvious. The volcanics can be subdivided into within-rift, rift-proximal and rift-distal groups according to their distance from the rift. The amount of volcanic products rapidly increase with this distance.
   Alkalinity of the three volcanic groups decreases successively to the rift-distal group, the products become more acid, richer in Al2O3 and CaO and poorer in TiO2, P2O5, FeOtot and MgO and depleted in LREE. This reflects different depth reached by volcanic feeders and different grades of partial melting in the source area
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    14. 2. 2008
Datum importu
    8. 8. 2012