Record details

    Dead Sea Region: Fault-Controlled Chemistry of Cenozoic Volcanics
Statement of responsibility
    Ferry Fediuk, Al fugha
Other titles
    Magmatism and Rift Basin Evolution (Variant.)
    Al fugha, Hassan
    Fediuk, František, 1929-
Source title - serial
    Vol. 9
    p. 29-34
    6 obr., 2 s.bibl.
Subject group
    chemismus hornin
    kontrola tektonická
    vzácné zeminy
    zóna riftová
Geographical name
    Saudská Arabie
Abstract (in english)
   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
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    14. 2. 2008
Import date
    8. 8. 2012