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  • 1 Department of Geology, University of Tabriz, Tabriz, Iran
  • | 2 Institut für Geologische Wissenschaften, Freie Universität, Berlin, Germany
  • | 3 51664, Tabriz, Iran
  • | 4 Malteserstr. 74-100, 12249, Berlin, Germany
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Abstract

The Kaleybar nepheline syenite intrusion forms the largest silica undersaturated alkaline exposure in northwestern Iran. It consists of various rock types ranging from nepheline syenite to nepheline diorite that were emplaced during Eocene-Oligocene times, corresponding to the Alpine orogeny. The essential rock-forming minerals in nepheline syenite are plagioclase, K-feldspar, nepheline and amphibole. Clinopyroxene is the dominant phase in nepheline diorites. Titanian garnet occurs as an uncommon accessory phase forming reddish to deep brown individual grains.

Chemically it is intermediate between Ti-andradite (67 to 78 mole %) and grossular (21 to 33 mole %) with TiO2 contents ranging from 1.5 to 5.0 wt %. Stoichiometry and R-mode factor analysis on garnet chemistry show that the dominant exchange vectors are Si-Ti and Al-Fe substitutions in the tetrahedral and octahedral crystal sites, respectively. A magmatic origin of the investigated Ti-garnet is suggested on the basis of mineralogical criteria and chemical properties.

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Editor(s)-in-Chief: Attila DEMÉNY

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Co-ordinating Editor(s): Gábor SCHMIEDL

Editorial Board

  • Zsolt BENKÓ (Geochemistry, Ar dating; Institute for Nuclear Research, Debrecen)
  • Szabolcs HARANGI (Petrology, geochemistry, volcanology; Eötvös Loránd University, Budapest)
  • Anette GÖTZ (Sedimentology; Landesamt für Bergbau, Energie und Geologie, Hannover)
  • János HAAS (Regional Geology and Sedimentology; Eötvös Loránd University, Budapest)
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  • Henry M. LIEBERMAN (Language Editor; Salt Lake City)
  • János KOVÁCS (Quaternary geology; University of Pécs)
  • Szilvia KÖVÉR (Sedimentology; Eötvös Loránd University, Budapest)
  • Tivadar M. TÓTH (Mineralogy; Petrology    University of Szeged)
  • Stephen J. MOJZSIS (Petrology, geochemistry and planetology; University of Colorado Boulder)
  • Norbert NÉMETH (Structural geology; University of Miskolc)
  • Attila ŐSI (Paleontology; Eötvös Loránd University, Budapest)
  • József PÁLFY (Fossils and Stratigraphic Records; Eötvös Loránd University, Budapest)
  • György POGÁCSÁS (Petroleum Geology; Eötvös Loránd University, Budapest)
  • Krisztina SEBE (Tectonics, sedimentology, geomorphology University of Pécs)
  • Ioan SEGHEDY (Petrology and geochemistry; Institute of Geodynamics, Bucharest)
  • Lóránd SILYE (Paleontology; Babeș-Bolyai University, Cluj-Napoca)
  • Ákos TÖRÖK (Applied and Environmental Earth Sciences; Budapest University of Technology and Economics, Budapest)
  • Norbert ZAJZON (Petrology and geochemistry; University of Miskolc)
  • Ferenc MOLNÁR (ore geology, geochemistry, geochronology, archaeometry; Geological Survey of Finland, Espoo)

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Due to the changes in editorial functions, the Advisory Board has been terminated. The participation of former Advisory Board members is highly appreciated and gratefully thanked.

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Central European Geology
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Vol 64- : A4
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2021 Volume 64
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