Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 5, Pages 916-920Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50217
Keywords
Hf isotopes; weathering; seawater array
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Funding
- National Science Foundation of China [41102103, 41021002, 41173105]
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To investigate the mechanisms of the offset of seawater radiogenic Nd-Hf isotope compositions from those of the upper continental crust rocks, combined Nd-Hf isotope compositions of desert and loess samples from northern China (which integrate a wide range of lithologies and ages of continental rocks) are presented in this study. The results show significant and systematic fractionation of Hf isotopes between fine-grained detritals/leachates (<5 mu m) and coarser fractions (<75 mu m) of the same samples. A small but systematic difference of Nd isotope compositions between leachates and detrital silicates is also revealed. Overall, the leaching data either plot along or slightly above the Nd-Hf seawater array, providing strong direct support that the seawater Nd-Hf isotope relationship is predominantly generated by weathering of upper continental crust. Our study supports the application of dissolved Hf isotopes as a proxy for different modes of weathering regimes rather than for continental source provenances.
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