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Mineralogical and geochemical characteristics (major, minor, trace elements and REE) of detrital and authigenic clay minerals in a Cenozoic sequence from Ross Sea, Antarctica

Published online by Cambridge University Press:  09 July 2018

M. Setti ,
L. Marinoni  and
A. López-Galindo
M. Setti
Affiliation:
Dipartimento di Scienze della Terra, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy
L. Marinoni
Affiliation:
Dipartimento di Scienze della Terra, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy
A. López-Galindo
Affiliation:
Instituto Andaluz de Ciencias de la Tierra, CSIC, University of Granada, 18071 Granada, Spain
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Abstract

The mineralogy and geochemistry of the clay fraction of Victoria Land Basin (Ross Sea, Antarctica) sediments was investigated, to determine the origin of clay minerals and the features of authigenic smectite. The investigated core (CRP-3) is ~800 m long, mostly of Oligocene age. The clay fraction of the upper sequence consists of mica, chlorite and detrital smectite, while that of the central and lower part is largely made up of authigenic smectite. Authigenic smectites are ditrioctahedral, with a composition close to saponite, while detrital smectites such as Al-Fe beidellites are dioctahedral. Authigenic smectites have no illite mixed layers, show a higher degree of crystallization, higher MgO, Fe2O3, V, Cr, Co, Ni and Sc contents and lower SiO2, Al2O3, K2O, TiO2, Ba, Rb and Zr contents with respect to detrital clay minerals, and a clear depletion of LREE with respect to HREE. Authigenic smectite formed from the alteration of volcanic materials and clay minerals.

Keywords

AntarcticaRoss Seaclay mineralssmectiteREEgeochemistry
Type
Research Article
Information
Clay Minerals , Volume 39 , Issue 4 , December 2004 , pp. 405 - 421
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

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