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Lead isotopic composition of Hercynian granitic K-feldspars constrains continental genesis

Abstract

Lead isotope compositions have been determined in many K-feldspars from granitic rocks emplaced during the Variscan (Hercynian) orogeny sensu lato (around 300 Myr) in various parts of Europe and the eastern US. The ratios show a regular geographical pattern with μ contours arched around southern France and parallel to the Atlantic coast of the US. This distribution parallels predriftpalaeogeographical zones during the Palaeozoic. The lead isotope pattern of Variscan granitic rocks is similar to that of some orogenic volcanic suites but is better explained by crustal melting than by an Hercynian mantle-crust material mixing. The continental crust from these areas must be older than 3,000 Myr. Large scale fluid circulation in the crust during orogenic processes apparently explains the observed geographical patterns of lead isotopes.

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Vitrac, A., Albarede, F. & Allègre, C. Lead isotopic composition of Hercynian granitic K-feldspars constrains continental genesis. Nature 291, 460–464 (1981). https://doi.org/10.1038/291460a0

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