DBPapers
DOI:10.5593/SGEM2013/BA1.V1/S01.017

MINERALOGICAL AND GEOCHEMICAL CHARACTERIZATION OF CAN VOLCANICS AND RELEATED KAOLIN DEPOSITS, CANAKKALE, TURKEY

H. U. Ercan, O. I. Ece, Z. Karacik
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Science and Technologies In Geology, Exploration and Mining, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-954-91818-7-6 / ISSN 1314-2704, June 16-22, 2013, Vol. 1, 121 - 128 pp

ABSTRACT

The Saribeyli - Siğirli and Bodurlar kaolin deposits (Çanakkale) are hosted by andesitic
tuffs of the Oligocene volcanic rocks. Çan volcanis are classified as andesite, basalticandesite
and basaltic-trachy andesite and tuffs can be classified as andesite and rhyolite.
Saribeyli-Siğirli kaolin deposit exposes the following mineral zonations from the fault
zone to the outer; i) quartz, ii) alunite ±quartz ±kaolinite ±dickite, iii) kaolinite ±dickite
±alunite ±quartz and iv) kaolinite +illite +feldspar, respectively. Bodurlu kaolin deposit
exposes the following mineral zonations from the fault zone to the outer; i) quartz ±Feoxides
±alunite ±jarosite and ii) kaolinite ±halloysite ±illite ±quartz ±feldspar,
respectively. The N30°W trending two faults passes through the north and south
boundaries of kaolin quarry and four quarries have been operating inside the small scale
graben. Fault zones pass through inside the Bodurlu quarry exhibit a group of six
parallel fracture systems rather than single fault zone and kaolinization occurred
between and vicinity of these fracture systems. Based on FE-SEM studies, micromorphologic
features of kaolinite crystals show that kaolinite occurs as hexagonal
blocky and book-shaped kaolinite which forms as ordered and disordered crystals.
Halloysite habits are parallel and randomly non-parallel sticks. The δ34S values of
Saribeyli-Siğirli deposits range from +4.1 to +2.4 ‰ and these values reflect its
formation from magmatic-hydrothermal derived sulfur source. The δ18O and δD values
in these deposits range from + 6.7 to + 12.7 ‰ and from – 61 to – 97 ‰, respectively,
which are very close the line of primitive magmatic water. Isotopes data suggest that
original geothermal waters were the mixture of magmatic water and meteoric waters. Oand
H-isotopic values of the Bodurlu kaolin deposit are between δ18O +14.5 / +17 ‰
and for δD –90 / –99 ‰, which data reflect genesis of supergene origin and enriched
regarding of δ18O values.
According to mineralogical, geochemical and S-O-H data, these deposits were occurred
by the ascending acidic geothermal waters through fault zones in the shallow epithermal
systems, which are rich in kaolinite minerals. These steam-heated environments
including hot-water outlets, H2S enriched vapor and groundwater mixed in the vadose
zone. These hypogene origin H2SO4 rich geothermal fluids cooled and oxidized when
they mixed with cold groundwater when they reached to the surface through fault
systems.

Keywords: Biga Peninsula, kaolin, alunite, stable isotopes, geochemistry.

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