Field, petrographic and geochemical characteristics of the Hamit alkaline intrusion in the Central Anatolian Crystalline Complex, Turkey

İLBEYLİ N.

Turkish Journal of Earth Sciences, cilt.13, sa.3, ss.269-286, 2004 (Scopus) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 13 Sayı: 3
  • Basım Tarihi: 2004
  • Dergi Adı: Turkish Journal of Earth Sciences
  • Derginin Tarandığı İndeksler: Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.269-286
  • Anahtar Kelimeler: A-type granites, Central Anatolian Crystalline Complex (CACC), Hamit pluton, Post-collisional intrusives, Syenite
  • Hatay Mustafa Kemal Üniversitesi Adresli: Hayır

Özet

The Hamit pluton is one of the alkaline intrusions in the Central Anatolian Crystalline Complex (CACC). The pluton consists of nepheline syenite, pseudoleucite syenite, alkali-feldspar syenite and quartz syenite. The nepheline syenite and pseudoleucite syenite are cut by foid-bearing microsyenitic dykes, whereas the alkali-feldspar syenite and quartz syenite are cut by aplitic and silicic dykes. The predominantly peralkaline Hamit intrusive rocks possess field, petrographic and geochemical characteristics comparable to A-type granites. All intrusive rocks of this pluton show enrichment in LILE and LREE relative to HFSE. The Th/Yb versus Ta/Yb plot suggests that the intrusive rocks formed from an enriched mantle source region carrying a subduction component inherited from pre-collision subduction events. Either thermal perturbation of the metasomatised lithosphere by delamination of the thermal boundary layer (TBL) or removal of a subducted plate (slab breakoff) are the likely mechanisms for initiation of the post-collisional magmatism of this complex.