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Mineralogy of glaciomarine sediments from the Prydz Bay–Kerguelen region: relation to modern depositional environments

Published online by Cambridge University Press:  16 November 2010

Andreas Borchers ,
Ines Voigt ,
Gerhard Kuhn  and
Bernhard Diekmann
Andreas Borchers*
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam Telegrafenberg A43, 14473 Potsdam, Germany
Ines Voigt
Affiliation:
University of Bremen, Geosciences Postbox 330440, 28334 Bremen, Germany
Gerhard Kuhn
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Research Unit Bremerhaven Columbusstrasse, 27568 Bremerhaven, Germany
Bernhard Diekmann
Affiliation:
Alfred Wegener Institute for Polar and Marine Research, Research Unit Potsdam Telegrafenberg A43, 14473 Potsdam, Germany
*
[email protected]
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Abstract

Surface mineralogical compositions and their association to modern processes are well known from the east Atlantic and south-west Indian sectors of the Southern Ocean, but data from the interface of these areas - the Prydz Bay–Kerguelen region - is still missing. The objective of our study was to provide mineralogical data of reference samples from this region and to relate these mineralogical assemblages to hinterland geology, weathering, transport and depositional processes. Clay mineral assemblages were analysed by means of X-ray diffraction technique. Heavy mineral assemblages were determined by counting of gravity-separated grains under a polarizing microscope. Results show that by use of clay mineral assemblages four mineralogical provinces can be subdivided: i) continental shelf, ii) continental slope, iii) deep sea, iv) Kerguelen Plateau. Heavy mineral assemblages in the fine sand fraction are relatively uniform except for samples taken from the East Antarctic shelf. Our findings show that mineralogical studies on sediment cores from the study area have the potential to provide insights into past shifts in ice-supported transport and activity and provenance of different water masses (e.g. Antarctic slope current and deep western boundary current) in the Prydz Bay–Kerguelen region.

Keywords

bottom waterclay mineralsEast Antarctic Ice Sheetheavy mineralsice raftingMac. Robertson Land
Type
Earth Sciences
Information
Antarctic Science , Volume 23 , Issue 2 , April 2011 , pp. 164 - 179
Copyright
Copyright © Antarctic Science Ltd 2010

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