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Pre-Hercynian mantle lead transfer to basement rocks as indicated by lead isotopes of the Schwarzwald crystalline, SW-Germany

II: Lead isotope evolution of the European Hercynides

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Abstract

As for the Schwarzwald, the lead isotopes of K-feldspars from the Vosges (Vitrac et al. 1981) and of leadzinc ores from the Massif Central (Brevart et al. 1982) can be treated as indicators of a pre-Hercynian mantle lead addition to the European basement. Pre-Hercynian mantlecrust interaction can therefore be modelled on a regional scale. The crustal lead isotope evolution does not seem to be characterized by frequent recycling by orogenic events. Parts of the European Hercynian belt feature enhanced production of radiogenic lead, in Precambrian U-and Th-enriched milieus. In order to fit the Precambrian lead isotope evolution of the European Hercynian units we used a two-stage model and a mathematical approach different from that of Brevart et al. (1982). This resulted in Early Proterozoic model ages for the separation of the Precambrian precursor rocks from the mantle (2.1–2.7 Ga). These model ages are only approximate estimates for the age of crustal precursor rocks, as the assumption of a simple two-stage mode is probably an oversimplification.

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Kober, B., Lippolt, H.J. Pre-Hercynian mantle lead transfer to basement rocks as indicated by lead isotopes of the Schwarzwald crystalline, SW-Germany. Contr. Mineral. and Petrol. 90, 172–178 (1985). https://doi.org/10.1007/BF00378258

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