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Geochemistry of halloysite-7Å formation from plagioclase in trachyandesite rocks from Limnos Island, Greece

Published online by Cambridge University Press:  27 February 2018

D. Papoulis ,
S. Komarneni  and
D. Panagiotaras
D. Papoulis*
Affiliation:
Department of Geology, Section of Earth Materials, University of Patras, GR-265 04 Patras, Greece
S. Komarneni
Affiliation:
Department of Crop and Soil Sciences and Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802, USA
D. Panagiotaras
Affiliation:
Department of Mechanical Engineering, Technological Educational Institute (TEI) of Western Greece, M. Alexandrou 1, 263 34 Patras, Greece
*
*E-mail: [email protected]
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Abstract

Trachyandesite rocks, occurring over an area of about 1 km2 in the southwest part of Limnos Island, Greece, are altered mainly to halloysite. The samples were collected and analysed by polarizing microscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and chemical analysis. The alteration of plagioclase to halloysite follows seven discrete stages that are described in detail. The geochemical evaluation of the data shows enrichment of the light REE (LREE) over heavy REE (HREE) as expressed by the (La/Yb)n ratio. The ΣLREE range from 206.44 to 272.30, while the sum of HREE varies from 11.01 to 26.26. The (La/Yb)n ratio ranges from 9.72 to 27.64. Fractionation among LREE expressed as (La/Sm)n and between middle REE (MREE) and HREE is shown as (Tb/Yb)n ratios. The most altered rocks close to the fault zone have high (Tb/Yb)n ratios and low (La/Sm)n and Eu/Eu* ratios. Although mineralogy and clay mineral textures indicate hydrothermal genesis of halloysite, the geochemical data are not conclusive due to a secondary weathering effect.

Keywords

halloysite formationhydrothermal alterationplagioclase alterationREE fractionationLimnos Island, Greece
Type
The 14th George Brown Lecture
Information
Clay Minerals , Volume 49 , Issue 1 , March 2014 , pp. 75 - 89
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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