Strontium isotope composition of alpine-type ultramafic rocks in the Lake Chatuge District,Georgia—North Carolina |
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| Authors: | Lois M Jones M E Hartley III Raymond L Walker |
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| Institution: | 1. Department of Geology, University of Georgia, 30601, Athens, Georgia
3. Oak Ridge National Laboratory, 37830, Oak Ridge, Tennessee
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| Abstract: | The 87Sr/86Sr ratios for a series of ultramafic rocks from the Lake Chatuge region range from 0.7023 to 0.7047, suggesting a direct upper mantle source and precluding a multiple differentiation origin for these alpine-type rocks. Higher 87Sr/86Sr ratios (0.7058–0.7068) for serpentinized rocks from this suite apparently reflect the influx of radiogenic 87Sr from the surrounding gneisses and schists during serpentinization. |
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