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Silicate weathering in anoxic marine sediments

Published online by Cambridge University Press:  05 July 2018

K. Wallmann ,
G. Aloisi ,
M. Haeckel ,
P. Tishchenko ,
G. Pavlova ,
J. Greinert ,
S. Kutterolf  and
A. Eisenhauer
K. Wallmann*
Affiliation:
IFM-GEOMAR Leibniz Institute of Marine Sciences, Wischhofstrasse 1-3, 24148 Kiel, Germany
G. Aloisi
Affiliation:
Laboratoire de Paléoenvironnements et Paléobiosphère, Université Claude Bernard — Lyon I, 2, rue Dubois, F- 69622 Villeurbanne cedex, France
M. Haeckel
Affiliation:
IFM-GEOMAR Leibniz Institute of Marine Sciences, Wischhofstrasse 1-3, 24148 Kiel, Germany
P. Tishchenko
Affiliation:
Pacific Oceanological Institute (POI), 43, Baltiyskaya Street, 690041 Vladivostok, Russia
G. Pavlova
Affiliation:
Pacific Oceanological Institute (POI), 43, Baltiyskaya Street, 690041 Vladivostok, Russia
J. Greinert
Affiliation:
Renard Centre of Marine Geology Department of Geology and Soil Science, Ghent University, Krijgslaan 281 s.8 B-9000 Ghent, Belgium
S. Kutterolf
Affiliation:
IFM-GEOMAR Leibniz Institute of Marine Sciences, Wischhofstrasse 1-3, 24148 Kiel, Germany
A. Eisenhauer
Affiliation:
IFM-GEOMAR Leibniz Institute of Marine Sciences, Wischhofstrasse 1-3, 24148 Kiel, Germany
*
*E-mail: kwallmann@ifm-geomar.de
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Extract

Two sediment cores retrieved at the northern slope of Sakhalin Island, Sea of Okhotsk, were analysed for biogenic opal, organic carbon, carbonate, sulphur, major element concentrations, mineral contents and dissolved substances including nutrients, sulphate, methane, major cations, humic substances and total alkalinity. Down-core trends in mineral abundance suggest that plagioclase feldspars and other reactive silicate phases (olivine, pyroxene, volcanic ash) are transformed into smectite in the methanogenic sediment sections. The element ratios Na/Al, Mg/Al and Ca/Al in the solid phase decrease with sediment depth indicating a loss of mobile cations with depth and producing a significant down-core increase in the chemical index of alteration.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 363 - 366
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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