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The control of weathering processes on riverine and seawater hafnium isotope ratios

Bayon, Germaine; Vigier, Nathalie; Burton, Kevin W.; Brenot, Agnes; Carignan, Jean; Etoubleau, Joel and Nan-Chin, Chu (2006). The control of weathering processes on riverine and seawater hafnium isotope ratios. Geology, 34(6) pp. 433–436.

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Hafnium 176Hf/177Hf isotope ratio variations in marine records are thought to reflect changes in continental weathering through time, but the behavior of Hf in rivers, and during weathering, is not well understood. Here, we present 176Hf/177Hf data for rivers, bedrock, soils, and leaching experiments for the Moselle basin, Vosges, France. These data strongly suggest that the 176Hf/177Hf composition of river waters is controlled by preferential dissolution of accessory phases (i.e., apatite, sphene) versus more resistant minerals (e.g., K-feldspar) and linked to the intensity of silicate weathering. Estimates for the global isotopic composition of riverine Hf suggest that the ocean Hf budget may be dominated by river input, and variations seen in marine records can be directly related to changes in silicate weathering intensity.

Item Type: Journal Article
ISSN: 0091-7613
Keywords: hafnium isotopes; rivers; silicate weathering; ocean chemistry
Academic Unit/Department: Science > Environment, Earth and Ecosystems
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6645
Depositing User: Users 2315 not found.
Date Deposited: 02 Feb 2007
Last Modified: 14 Jan 2016 16:25
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