Petrologic evolution of Miocene-Pliocene mafic volcanism in the Kangal and Gurun basins (Sivas-Malatya), central east Anatolia: Evidence for Miocene anorogenic magmas contaminated by continental crust

Kocaarslan A., Ersoy E. Y.

LITHOS, cilt.310, ss.392-408, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 310
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.lithos.2018.04.021
  • Dergi Adı: LITHOS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.392-408
  • Anahtar Kelimeler: Central-eastern Anatolia, Anorogenic volcanism, Partial melting, Crustal assimilation, Isotope geochemistry, TRACE-ELEMENT, COLLISION ZONE, CENTRAL TURKEY, FAULT ZONE, POSTCOLLISIONAL VOLCANISM, GEOCHEMICAL EVOLUTION, BASALTIC VOLCANISM, MT. KARACADAG, NEOGENE, MANTLE
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

This study discusses the geochemical features of the Early-Middle Miocene and Pliocene basaltic (SiO2 = similar to 46-52; MgO = similar to 6-10 wt%) to andesitic (SiO2 = similar to 59; MgO = similar to 4 wt%) rocks exposed in the Gurun and Kangal basins (Sivas, eastern part of central Anatolia), respectively. The basaltic rocks are characterized by alkaline to tholeiitic affinities, while the more evolved andesitic samples show calc-alkaline affinity. Trace element variations reveal that they can be evaluated in three sub-groups, each represented by different contents of trace elements for given Nb contents. Primary magmas of each groups were likely produced by different degrees of partial melting (similar to 1-2, 2-3, 7-10% respectively) from a common mantle source, subsequently underwent different degrees of fractionation and crustal contamination. Derivation from a common mantle source of the primitive magmas of each group is supported by similar Sr, Nd and Pb isotopic ratios. Increasing degrees of partial melting seem to be responsible for the alkaline to tholeiitic variation among the basaltic samples, while higher degrees of crustal contamination (AFC) resulted in calc-alkaline affinity of the more evolved samples.