Turkish Journal of Earth Sciences
Abstract
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.
DOI
-
Keywords
Hamit pluton, Central Anatolian Crystalline Complex (CACC), syenite, A-type granites, post-collisional intrusives
First Page
269
Last Page
286
Recommended Citation
İLBEYLİ, NURDANE (2004) "Field, Petrographic and Geochemical Characteristics of the Hamit Alkaline Intrusion in the Central Anatolian Crystalline Complex, Turkey," Turkish Journal of Earth Sciences: Vol. 13: No. 3, Article 2. Available at: https://journals.tubitak.gov.tr/earth/vol13/iss3/2
