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Geochemistry and Petrogenesis of Intracontinental Basaltic Volcanism on the Northwest Arabian Plate, Gaziantep Basin, Southeast Anatolia, Turkey
Author(s) -
KÜRÜM Sevcan,
BÖLÜCÜ Abdurrahman,
URAL Melek
Publication year - 2018
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/1755-6724.13540
Subject(s) - geology , geochemistry , partial melting , petrogenesis , mantle (geology) , basalt , peridotite , volcanic rock , isotope geochemistry , fractional crystallization (geology) , ophiolite , primitive mantle , incompatible element , volcano , tectonics , isotope , paleontology , physics , quantum mechanics
Volcanism along the northwest boundary of the Arabian Plate found in the Gaziantep Basin, southeast Turkey, is of Miocene age and is of alkaline and calc‐alkaline basic composition. The rare earth element data for both compositional series indicates spinel–peridotite source areas. The rare earth and trace elements of the alkaline lavas originate from a highly primitive and slightly contaminated asthenospheric mantle; those of the calc‐alkaline lavas originate from a highly heterogeneous, asthenospheric, and lithospheric mantle source. Partial melting and magmatic differentiation processes played a role in the formation of the petrological features of these volcanics. These rocks form two groups on the basis of their 87 Sr/ 86 Sr and 143 Nd/ 144 Nd isotopic compositions in addition to their classifications based on their chemical compositions (alkaline and calc‐alkaline). These isotopic differences indicate a dissimilar parental magma. Therefore, high Nd isotope samples imply a previously formed and highly primitive mantle whereas low Nd isotope samples may indicate comparable partial melting of an enriched heterogeneous shallow mantle. Other isotopic changes that do not conform to the chemical features of these lavas are partly related to the various tectonic events of the region, such as the Dead Sea Fault System and the Bitlis Suture Zone.