Radiogenic Isotope Evolution of the Deep Arctic Ocean since the Late Miocene: Ferromanganese Crust Evidence.

Dausmann, Veit (2013) Radiogenic Isotope Evolution of the Deep Arctic Ocean since the Late Miocene: Ferromanganese Crust Evidence. (Master thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 59 pp.

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Abstract

A first ferromanganese crust record of neodymium, hafnium and lead isotopes, reflecting
the deep water evolution of the Arctic Ocean was compiled during this work. The
archives were dated using beryllium isotopes and reach back to the late Miocene. The
isotopic signatures of three crusts from the flanks of sea mounts at the northernmost edge
of the Northwind Ridge in the Canada Basin reflect changes in continental weathering
influxes and contributions of inflowing deep water from the North Atlantic on a million
year scale. The data show that stable conditions prevailed until about 4 Ma before today.
After that, climatically controlled changes in weathering regime and sediment transport
on the North American continent have driven the Arctic Deep Water chemistry in the
deep Canada Basin until today. From our records we conclude that the first influences of
strong glacial-like weathering conditions on the North American continent reached the
Arctic Deep Water as early as 4 Ma and have prevailed there ever since.

Document Type: Thesis (Master thesis)
Thesis Advisor: Frank, Martin and Siebert, Christopher
Keywords: Arctic Ocean, Canada Basin, radiogenic isotope evolution, ferromanganese crust
Subjects: Course of study: MSc Marine Geosciences
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Open Access Journal?: No
Date Deposited: 21 Jan 2014 07:06
Last Modified: 20 Apr 2016 08:06
URI: http://oceanrep.geomar.de/id/eprint/23153

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