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Fe3+-Rich Montmorillonite-Beidellite Series in Ayvacik Bentonite Deposit, Biga Peninsula, Northwest Turkey

Published online by Cambridge University Press:  28 February 2024

Fazli Çoban  and
Ö. Işik Ece
Fazli Çoban
Affiliation:
Istanbul Technical University, Mining Faculty, Mineralogy-Petrology Division, Maslak, 80626 Istanbul, Turkey
Ö. Işik Ece
Affiliation:
Istanbul Technical University, Mining Faculty, Mineralogy-Petrology Division, Maslak, 80626 Istanbul, Turkey
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Abstract

The Ayvacık bentonites, products of Miocene calc-alkaline volcanic rocks, are composed of smectite of the montmorillonite-beidellite series. Fault-related hydrothermal solutions have altered andesitic rocks to dioctahedral smectites. Differences in the micro-morphology of the two end-members are distinguished by scanning electron microscopy (SEM) studies. The beidellite particles are of delicate ribbons and rosette habits, whereas montmorillonite particles are very thin, curled sheets and flakes. Clay size (<2 µm) fractions contain (in wt. %) 54.90–56.80 SiO2, 19.65–28.54 Al2O3, 0.45–6.28 Fe2O3, 0.10–1.72 CaO, 0.80–4.15 MgO, 0.55–1.88 K2O, and 0.08–1.15 Na2O, which confirm that the beidellites are Fe-rich (5.06–6.28 wt. %), except for one sample (0.45 wt. % Fe2O3). The Greene-Kelly test (Li-saturation and heating) gave very good results for the measurement of the d(001) of the two end-members. Nickel, Ti, and Cr enrichment in smectite is related to the chemical composition of hydrothermal solutions that passed through the ophiolite complex.

Keywords

Biga PeninsulaFe-rich BeidelliteMontmorilloniteTurkey
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 2 , April 1999 , pp. 165 - 173
Copyright
Copyright © 1999, The Clay Minerals Society

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