HR: 0800h
AN: PP41D-0780    [Abstracts]
TI: Bulk Mineral Assemblage of the PETM and Other Extreme Warm Events in the IODP Arctic Ocean Coring Expedition's Sediments - Weathering vs. Transport
AU: * Vogt, C M
EM: cvogt@uni-bremen.de
AF: Crystallography,Department of Geosciences, University of Bremen, Klagenfurter Strasse 2, Bremen, 28359, Germany
AU: Fischer, R X
EM: rfischer@uni-bremen.de
AF: Crystallography,Department of Geosciences, University of Bremen, Klagenfurter Strasse 2, Bremen, 28359, Germany
AU: Stein, R
EM: rstein@awi-bremerhaven.de
AF: Alfred Wegener Institut for Polar and Marine Research, Columbusstrasse, Bremerhaven, 27568, Germany
AB: The Arctic Coring Expedition (ACEX) recovered several meter of sediment containing the Paleocene and Eocene extreme warm events from the central part of the Lomonosov Ridge. Here we present a 20 cm sample resolution study of these sediments. The bulk mineral assemblage of these samples will be compared to our Arctic Ocean and shelf region surface sediment dataset of more than 2000 samples. All these samples have been investigated during the last 15 years by X-ray diffraction with the same sample preparation, measurement equipment and full-pattern quantification techniques. Therefore, results are fully comparable. Sources of the terrigenous components of the ACEX sediments are not well known yet, in particular of the Tertiary section. The presentation will try to enlighten the question if the mineral assemblage presents rather changes in transportation processes and pathways and/or different weathering conditions in the surrounding hinterland. Changing weathering conditions to warmer and wet conditions for example should show up in increases of mineral contents of clay minerals and in particular kaolinites. But, despite the cold and rather physical weathering conditions in the today Polar Arctic region, there are source rock regions with very high contents of kaolinite. As these sediments are in particular of Triassic and Jurassic age, it might not be easy to relate high kaolinite values in the ACEX sediments to the suggested warmer and wet weathering conditions during the Paleocene and Eocene warm events.
DE: 3675 Sedimentary petrology
DE: 4835 Marine inorganic chemistry (1050)
DE: 4948 Paleocene/Eocene thermal maximum
DE: 9315 Arctic region (0718, 4207)
DE: 9606 Paleogene
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2007 Fall Meeting