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GEOREF RECORD

Mineralogy, geochemistry, and diagenesis of clinoptilolite tuffs (Miocene) in the central Simav Graben, western Turkey

Ruben Snellings, Tom van Haren, Lieven Machiels, Gilles Mertens, Noel Vandenberghe and Jan Elsen
Mineralogy, geochemistry, and diagenesis of clinoptilolite tuffs (Miocene) in the central Simav Graben, western Turkey
Clays and Clay Minerals (December 2008) 56 (6): 622-632

Abstract

Miocene rifting and associated rhyolitic (K-rich) volcanism resulted in the deposition of pyroclastic material in the central Simav graben, near Karacaderbent, Turkey. The pyroclastics were deposited in a lacustrine environment, altered to clinoptilolite-rich tuffs and cross-cut by several transform faults along which hydrothermal fluids circulated. Petrography and quantitative phase analysis by X-ray diffraction show that the Karacaderbent tuff consists mainly of the diagenetic products clinoptilolite, opal CT, smectite, and celadonite. Electron microprobe analyses and cation exchange capacity (CEC) measurements confirm the predominance of K-rich clinoptilolite. Near fault zones, clinoptilolite was replaced by authigenic opal CT and alkali feldspar, and the remaining clinoptilolite was enriched in Na. Silicification around fault zones was confirmed by X-ray fluorescence. Zeolitization of K-rich rhyolitic starting materials took place under mildly alkaline, low-salinity conditions, probably in a closed hydrologic system. The subsequent hydrothermal alteration along faults had only a minor impact. The homogeneous nature, large (74-87 wt.%) clinoptilolite content, large CEC, and K-rich composition of the deposit favor exploitation of this material for applications in agriculture, horticulture, and waste-water purification; as feed additives; and as pozzolans for cement production.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 56
Serial Issue: 6
Title: Mineralogy, geochemistry, and diagenesis of clinoptilolite tuffs (Miocene) in the central Simav Graben, western Turkey
Affiliation: Catholic University of Leuven, Department of Earth and Environmental Sciences, Louvain, Belgium
Pages: 622-632
Published: 200812
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 36
Accession Number: 2009-032295
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 plates, 5 tables, geol. sketch maps
N39°00'00" - N39°00'00", E29°00'00" - E29°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200918
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