- Turkish Journal of Earth Sciences
- Vol: 16 Issue: 4
- Jurassic Volcanism in the Eastern Pontides: Is it Rift Related or Subduction Related?
Jurassic Volcanism in the Eastern Pontides: Is it Rift Related or Subduction Related?
Authors : Cüneyt Şen
Pages : 523-539
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Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :The Jurassic volcanic rocks in the centre of the northern zone (south of Trabzon City) provide important constraints on the evolution of Pontides. The investigated volcanic rocks form a transitional series between tholeiitic and calc-alkaline, and is dominated by basalt, basaltic andesite and andesite. Geochemically, they are enriched in LILE and LREE contents and depleted in HFSE [(La/Yb)N= 2.2 - 8.5; (Nb/La)N= 0.1 - 0.77)] compared to mid-ocean ridge basalts and have radiogenic Nd isotope ratios of eNd(210 Ma)= -0.72 to 3.24. These trace element and isotope data suggest that these rocks were derived from low degrees of partial melting of spinel lherzolite that was metasomatized by subduction-related fluids and further underwent a degree of fractional crystallization in magma chambers before being extruded at the surface.Keywords : Eastern Pontides, geochemistry, Sr-Nd isotopes, Jurassic, basalt, Turkey