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Geology; October 2004; v. 32; no. 10; p. 861-864; DOI: 10.1130/G20734.1
© 2004 Geological Society of America
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Radiogenic isotope records of Quaternary glaciations: Changes in the erosional source and weathering processes

Ben C. Reynolds*,1, Sarah C. Sherlock*,2, Simon P. Kelley*,2 and Kevin W. Burton*,2

1 Department of Earth Sciences, Open University, Walton Hall, Milton Keynes, Bucks MK7 6AA, UK, and Institute for Isotope Geology and Mineral Resources, Department of Earth Sciences, ETH-Zentrum NO, Sonneggstrasse 5, CH-8092 Zürich, Switzerland
2 Department of Earth Sciences, Open University, Walton Hall, Milton Keynes, Bucks MK7 6AA, UK

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.

Key Words: weathering • isotope geochemistry • radiogenic isotopes • glacial erosion • argon-argon




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Rapid Glacial Erosion at 1.8 Ma Revealed by 4He/3He Thermochronometry
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[Abstract] [Full Text] [PDF]


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