A late Miocene - early Pliocene Antarctic deepwater record of repeated iron reduction events.

Hepp, D. A., Mörz, T., Hensen, Christian , Frederichs, T., Kasten, S., Riedinger, N. and Hay, William W. (2009) A late Miocene - early Pliocene Antarctic deepwater record of repeated iron reduction events. Marine Geology, 266 . pp. 198-211. DOI 10.1016/j.margeo.2009.08.006.

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In this study we present a late Miocene–early Pliocene record of sixty-four zones with prominent losses in the magnetic susceptibility signal, taken on a sediment drift (ODP Site 1095) on the Pacific continental rise of the West Antarctic Peninsula. The zones are comparable in shape and magnitude and occur commonly at glacial-to-interglacial transitions. High resolution records of organic matter, magnetic susceptibility and clay mineral composition from early Pliocene intervals demonstrate that neither dilution effects nor provenance changes of the sediments have caused the magnetic susceptibility losses. Instead, reductive dissolution of magnetite under suboxic conditions seems to be the most likely explanation. We propose that during the deglaciation exceptionally high organic fluxes in combination with weak bottom water currents and prominent sediment draping diatom ooze layers produced temporary suboxic conditions in the uppermost sediments. It is remarkable that synsedimentary suboxic conditions can be observed in one of the best ventilated open ocean regions of the World.

Document Type: Article
Keywords: ice sheet dynamic, magnetic susceptibility minima Zone, ODP Site 1095, Pliocene warming, Antarctic Peninsula
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.margeo.2009.08.006
ISSN: 0025-3227
Projects: Future Ocean, ODP
Date Deposited: 11 Jan 2010 12:41
Last Modified: 23 Sep 2019 19:14
URI: http://oceanrep.geomar.de/id/eprint/6216

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