Ar-Ar dating and petrogenesis of the Early Miocene Taskapi-Mecitli (Ercis-Van) granitoid, Eastern Anatolia Collisional Zone, Turkey


Oyan V.

JOURNAL OF ASIAN EARTH SCIENCES, vol.158, pp.210-226, 2018 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 158
  • Publication Date: 2018
  • Doi Number: 10.1016/j.jseaes.2018.03.002
  • Title of Journal : JOURNAL OF ASIAN EARTH SCIENCES
  • Page Numbers: pp.210-226
  • Keywords: Taskapi-Mecitli granitoid, Mafic crust-mantle interaction, Partial melting, Timing of collision, Eastern Anatolia, ARABIA-EURASIA COLLISION, ENERGY-CONSTRAINED ASSIMILATION, MAFIC MAGMATIC ENCLAVES, S-TYPE GRANITES, VOLCANIC-ROCKS, POSTCOLLISIONAL VOLCANISM, ISOTOPIC CHARACTERIZATION, CHEMICAL CLASSIFICATION, MICROGRANULAR ENCLAVES, GEOCHRONOLOGICAL DATA

Abstract

The Early Miocene Taskapi-Mecitli granitoid that is located in the northern section of the Eastern Anatolia Collision Zone has typical I-type, metaluminous and calk-alkaline characteristics. It also contains mafic micro-granular / magmatic enclaves (MMEs). New Ar-Ar dating results show that the age of the Taskapi-Mecitli granitoid is similar to 23 Ma and it crystallised in the Early Miocene, in contrast to its previously known Cretaceous age. Identical crystallisation ages (similar to 23 Ma), similar mineral assemblages and geochemical compositions, and indistinguishable isotopic compositions of MMEs and host rocks imply that the MMEs are most consistent with a cumulate origin formed at earlier stages of the same magmatic system that produced the Taskapi-Mecitli granitoid.