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Rb-Sr systematics of Permian volcanites in the Schwarzwald (SW-Germany)

Part II: Age of eruption and the mechanism of Rb-Sr whole rock age distortions

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Abstract

From the quartz porphyry occurrences of Haigerach and Geisberg (Central Schwarzwald), which were dated by minerals and whole-rock samples, the whole-rock samples generally yielded lower ages than the minerals. This result agrees with other studies on apparently rejuvinated whole-rock ages of acid volcanic rocks (compare McKerrow et al. 1980). Petrographic and geochemical observations show that two processes disturbed the Rb-Sr relations:

  1. 1)

    fast alterations immediately after extrusion, such as sericitization during autohydrothermal bleaching in the pipe area of the volcanoes, gain of Rb, addition of common Sr.

  2. 2)

    loss of radiogenic 87Sr due to long-lasting exchange processes with groundwaters.

The combined result of the two processes is a kind of isochron rotation simulating younger whole-rock ages and higher initial Sr isotope ratios. Our results on the two quartz porphyries indicate that whole-rock dating of such acid volcanics is not succesful.

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Author notes

  1. Helmut Schleicher

    Present address: Mineralogisches Institut der Universität, Albert-Straße, D-7800, Freiburg i.Br., FRG

  2. Ingrid Raczek

    Present address: Max-Planck Institut für Chemie, D-6500, Mainz, FRG

Authors and Affiliations

  1. Laboratorium für Geochronologie der Universität, Im Neuenheimer Feld 234, D-6900, Heidelberg, FRG

    Helmut Schleicher, Hans Joachim Lippolt & Ingrid Raczek

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  1. Helmut Schleicher
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  2. Hans Joachim Lippolt
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Schleicher, H., Lippolt, H.J. & Raczek, I. Rb-Sr systematics of Permian volcanites in the Schwarzwald (SW-Germany). Contr. Mineral. and Petrol. 84, 281–291 (1983). https://doi.org/10.1007/BF00371292

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