Mica Types as Indication of Magma Nature, Central Anatolia, Turkey

This study focuses on the nature of giant micas occurring at the contact between the Özvatan (foid‐bearing) syenites and the metamorphic basement in Central Anatolia. The studied micas are dark greenish‐black in color and crystallized within vein shape like bodies as a narrow lens. The origin and pr...

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Bibliographic Details
Published in:Acta geologica Sinica (Beijing) 2022-06, Vol.96 (3), p.844-857
Main Author: DENIZ, Kiymet
Format: Article
Language:English
Subjects:
Aluminum oxide
Analytical methods
Basements
Central Anatolia
Colour
Crystallization
Crystals
Electron probe
Electron probe microanalysis
Fluorescence
Fourier transforms
geothermobarometry
Infrared spectroscopy
Isotopes
Lava
Magma
Metamorphic rocks
Mica
Micas
Minerals
oxygen fugacity
phlogopite
Raman spectroscopy
Spectroscopy
Spectrum analysis
Titanium dioxide
Trace elements
Turkey
X-ray diffraction
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Summary:This study focuses on the nature of giant micas occurring at the contact between the Özvatan (foid‐bearing) syenites and the metamorphic basement in Central Anatolia. The studied micas are dark greenish‐black in color and crystallized within vein shape like bodies as a narrow lens. The origin and processes responsible for the formation of these independent crystals of the giant micas were investigated by mineralogical, petrographical and geochemical analyses with the use of Confocal Raman Spectroscopy (CRS), Fourier Transform Infrared (FTIR) Spectroscopy, X‐Ray Diffraction (XRD), Polarized Energy Dispersive X‐Ray Fluorescence Spectrometer (PED‐XRF) and Electron Probe Micro Analysis (EPMA). According to XRD, CRS, FTIR and EPMA data, the giant micas are phlogopite. EPMA results reveal that studied mica minerals represent the products of re‐equilibrated primary mica characterized by high MgO and FeO and low Al2O3 and TiO2 contents. The trace element concentrations of the giant micas display similar patterns with the upper crust. The giant micas are crystallized within small cubicles from an alkaline magma and their composition is possibly modified by a mixing event between the crust‐ and mantle‐derived magmas and contaminated at varying extent by the basement metamorphic rocks.
ISSN:1000-9515
1755-6724
DOI:10.1111/1755-6724.14670