Late Neoproterozoic granulite facies metamorphism in the Menderes Massif, Western Anatolia/Turkey: implication for the assembly of Gondwana

KORALAY O. E.

GEODINAMICA ACTA, cilt.27, sa.4, ss.244-266, 2015 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 4
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1080/09853111.2015.1014987
  • Dergi Adı: GEODINAMICA ACTA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.244-266
  • Anahtar Kelimeler: Gondwana, granulites, Menderes Massif, Kuunga Orogen, SHRIMP/LA-ICP-MS U-Pb dating, EAST-AFRICAN OROGEN, HIGH-PRESSURE GRANULITES, ND ISOTOPIC SYSTEMATICS, SOR RONDANE MOUNTAINS, SINGLE ZIRCON AGES, DRONNING MAUD LAND, U-PB ZIRCON, MOZAMBIQUE BELT, SM-ND, GRENVILLE-PROVINCE
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

The Menderes Massif is a major polymetamorphic complex in Western Turkey. The late Neoproterozoic basement consists of partially migmatized paragneisses and metapelites in association with orthogneiss intrusions. Pelitic granulite, paragneiss and orthopyroxene-bearing orthogneiss (charnockite) of the basement series form the main granulite-facies lithologies. Charnockitic metagranodiorite and metatonalite are magnesian in composition and show calc-alkalic to alkali-calcic affinities. Nd and Sr isotope systematics indicate homogeneous crustal contamination. The zircons in charnockites contain featureless overgrowth and rim textures representing metamorphic growth on magmatic cores and inherited grains. Charnockites yield crytallization age of similar to 590Ma for protoliths and they record granulite-facies overprint at similar to 580Ma. These data indicate that the Menderes Massif records late Neoproterozoic magmatic and granulite-facies metamorphic events. Furthermore, the basement rocks have been overprinted by Eocene Barrovian-type Alpine metamorphism at similar to 42Ma. The geochronological data and inferred latest Neoproterozoic-early Cambrian palaeogeographic setting for the Menderes Massif to the north of present-day Arabia indicate that the granulite-facies metamorphism in the Menderes Massif can be attributed to the Kuunga Orogen (600-500Ma) causing the final amalgamation processes for northern part of the Gondwana.