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Sepiolite-Palygorskite from the Hekimhan Region (Turkey)

Published online by Cambridge University Press:  28 February 2024

Hüseyin Yalçin  and
Ömer Bozkaya
Hüseyin Yalçin
Affiliation:
Department of Geological Engineering, Cumhuriyet University, 58140 Sivas, Turkey
Ömer Bozkaya
Affiliation:
Department of Geological Engineering, Cumhuriyet University, 58140 Sivas, Turkey
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Abstract

Upper Cretaceous-Tertiary marine clayey-calcareous rocks of the Hekimhan basin contain fibrous clay minerals in significant amounts. Ophiolitic rocks in the provenance area have contributed the elements to form the clay minerals. XRD, SEM, major, trace and REE analyses were applied to samples taken from several stratigraphic sections. Diagenetic minerals such as smectite, dolomite, calcite, gypsum, celestite and quartz/chalcedony are associated with sepiolite-palygorskite group clays. Trace and rare earth elements (REE) are more abundant in palygorskite than sepiolite. REE abundances in the sepiolite-palygorskite are characterized by negative Eu and positive Nd anomalies when normalized with respect to chondrite and shale. Sepiolites with sharp XRD peaks are formed by diagenetic replacement of dolomite and diagenetic transformation of palygorskite, or by direct crystallization from solution. The average structural formula of the sepiolite is:

(Mg7.15Al0.13Fe0.31Cr0.06Ni0.04)(Si11.98Al0.02)O30(OH)4(OH2)4Ca0.03Na0.02K0.02.8H2O

Palygorskite appears to be authigenic by direct precipitation from solution. It exists in both monoclinic and orthorhombic forms with the mean structural formula given below

(Mg2.22Al1.00Ti0.04Fe0.77Cr0.01Ni0.02)(Si7.68Al0.32)O20(OH)2(OH2)4Ca0.07Na0.05K0.10.4H2O

Keywords

GeochemistryHekimhanMineralogyPalygorskiteRare Earth ElementsSEMSepioliteSmectiteXRD
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 6 , December 1995 , pp. 705 - 717
Copyright
Copyright © 1995, The Clay Minerals Society

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