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Alteration of Volcanic Rocks and Genesis of Kaolin Deposits in the Şile Region, Northern Istanbul, Turkey. I: Clay mineralogy

Published online by Cambridge University Press:  01 January 2024

O. Isik Ece ,
Zenbe-E Nakagawa  and
Paul A. Schroeder
O. Isik Ece*
Affiliation:
Istanbul Technical University, Faculty of Mines, Mineralogy-Petrography Division, Maslak, 80626 Istanbul, Turkey Akita University, Research Institute of Materials and Resources, Faculty of Engineering and Resources Science, Tegatagakuen-Cho, Akita 010-8502, Japan
Zenbe-E Nakagawa
Affiliation:
Akita University, Research Institute of Materials and Resources, Faculty of Engineering and Resources Science, Tegatagakuen-Cho, Akita 010-8502, Japan
Paul A. Schroeder
Affiliation:
University of Georgia, Department of Geology, Athens, GA 30602-2501, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The Şile Region contains discontinuous, cyclic, thin coal beds and industrial clay deposits that were accumulated in lacustrine basins which received extensive volcanoclastic sediments due to transport of highly weathered calc-alkaline volcanic rocks. The Sülüklü area has the largest kaolin deposit in this region. Cyclic kaolinization depended on the degree of leaching of Si and alkalis in cyclic swamp environments and, therefore, kaolinite contents vary in each discontinuous lens-shaped clay bed and underclay within the basin. The kaolins comprise disordered kaolinite, illite, smectite, gibbsite, quartz, pyrite, anatase, K-feldspar and goethite. Depth-related changes in the distribution of clay minerals, associated with coal beds, are indicative of organic acid-mineral reactions. Kaolinite crystallization initiated at the edges of sericitic mica sheets in the form of composite kaolinite stacks. The small size (<1 µm), morphology and poor crystallinity of kaolinite crystals suggest that kaolinization post dated transportation. Primary or secondary origins of particles can be determined from the stacking sequences of kaolinite particles using high-resolution transmission electron microscopy images. Kaolinite stacks always contain a small amount of illite, but smectite is only present in the middle and upper levels. Gibbsite is a main constituent of refractory bauxitic clays locally found as discontinuous lenses and exploited from the lower level of the basin.

Genesis of kaolin deposits took place in two stages: first, there was in situ weathering of the oldest andesitic agglomerates, tuffs and ashes at the base of the lacustrine basin coupled with discharge of shallow thermal waters which were initiated by local hydrothermal alteration; second, surface weathering enhanced transportation of altered rocks from the surrounding hills into the lacustrine basin. Kaolinization took place in cyclic swamp environments, as indicated by the presence of cyclic thin- to thick-bedded coals that provided necessary humic and fulvic acids for the post-depositional alteration of altered volcanic rocks to kaolin in dysaerobic, relatively low-pH conditions in saturated groundwater zones.

Keywords

Andesitic SuiteCoal BedsDTADysaerobicFTIRKaoliniteLacustrine BasinSEMTEMWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 6 , December 2003 , pp. 675 - 688
Copyright
Copyright © 2003, The Clay Minerals Society

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