Reynolds, Ben C.; Sherlock, Sarah C.; Kelley, Simon P. and Burton, Kevin W.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1130/G20734.1|
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Variations of global and regional silicate weathering rates and paleo-ocean circulation patterns are estimated by using radiogenic isotope records, but the effects of changes in provenance are generally ignored. Here. sediment provenance has been constrained through the use of Ar-Ar ages for individual detrital minerals from the Labrador Sea, which can be compared directly to the radiogenic isotope compositions from the same core material. Dramatic changes in the radiogenic isotope composition of North Atlantic Deep Water through the Quaternary Period are shown to reflect discrete changes in both sources and weathering processes accompanying Northern Hemisphere glaciation. Changes in the different radiogenic isotope systems reflect the influence of source, physical weathering, and chemical weathering, and not simply changes in the underlying weathering rate or ocean circulation patterns that are typically inferred.
|Item Type:||Journal Article|
|Copyright Holders:||2004 Geological Society of America|
|Extra Information:||Some of the symbols may not have transferred correctly into this bibliographic record.|
|Keywords:||Atlantic deep-water; Fe-Mn Crusts; North-Atlantic; Ar-40/Ar-39 ages; Ferromanganese Crusts; PB Isotopes; ocean circulation; Heinrich Layers; ND; Pleistocene; weathering; isotope geochemistry; radiogenic isotopes; glacial erosion; argon-argon|
|Academic Unit/Department:||Science > Environment, Earth and Ecosystems
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Simon Kelley|
|Date Deposited:||05 Jun 2006|
|Last Modified:||14 Jan 2016 15:46|
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