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Book Chapter

Magmatism of the late Variscan intermontane Saar-Nahe Basin (Germany): A review

By
Volker Von Seckendorff
Volker Von Seckendorff
1
Institut für Mineralogie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany (e-mail: volker.von_seckendorff@mail.uni-wuerzburg.de)
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Christoph Arz
Christoph Arz
2
Institut für Geologie, Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany
3
Present address: Am Mittelpfad 4, D-65468 Trebur-Geinsheim, Germany
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Volker Lorenz
Volker Lorenz
2
Institut für Geologie, Universität Würzburg, Pleicherwall 1, D-97070 Würzburg, Germany
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Published:
January 01, 2004

Abstract

The Saar–Nahe Basin is a late Variscan intermontane basin that developed on the site of an earlier island arc, the Mid-German Crystalline Rise. Within the c. 6500m-thick continental sedimentary fill of the basin, a large variety of igneous rocks was emplaced over a period of c. 4 Ma from 296 to 293 Ma as high-level intrusions and lava flows, extrusive domes, diatremes and pyroclastic deposits, ranging in composition from basalt and basaltic andesite to rhyodacite, rhyolite and trachyte. Composite intrusive–extrusive complexes consist of andesite, rhyodacite and alkali feldspar trachyte with up to 10 wt% K2O. The geochemical characteristics of the most primitive mafic magmas indicate a slightly enriched upper mantle source modified by subduction-related fluids. Nd–Sr–O isotope data indicate that crustal contamination was important in the petrogenesis of the more differentiated magmas.

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Contents

Geological Society, London, Special Publications

Permo-Carboniferous Magmatism and Rifting in Europe

M. Wilson
M. Wilson
Leeds University, UK
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E.-R. Neumann
E.-R. Neumann
University of Oslo, Norway
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G. R. Davies
G. R. Davies
Vrije University, The Netherlands
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M. J. Timmerman
M. J. Timmerman
Universität Potsdam, Germany
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M. Heeremans
M. Heeremans
University of Oslo, Norway
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B. T. Larsen
B. T. Larsen
Norsk Hydro ASA/Saga Petroleum ASA, Norway
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Geological Society of London
Volume
223
ISBN electronic:
9781862394711
Publication date:
January 01, 2004

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