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The Spessart Crystalline Complex

  • K. Weber
Part of the IGCP-Project 233 book series (IGCP 233)

Abstract

The Spessart Crystalline Complex (SCC) is an approx. 25-km-wide, NE-trending asymmetric antiform with a steeply to vertically dipping southeastern and a more gently dipping northwestern limb (Figs. 1, 2 and 3). Lineations and fold axes plunge toward ENE and WSW. The core of the antiform is occupied by orthogneisses (“Rotgneis”) which are homotactically deformed together with their hanging wall paragneisses of the Mömbris Fm. The Michelbach fault in the northwestern part of the SCC separates the variegated amphibolite facies Alzenau Fm. in the NW from the upper greenschist facies, quartzitic-pelitic Geiselbach Fm. in the SE. On the base of lithological and geochemical data (Okrusch, Chap. IV.E) the variegated Elterhof Fm. of the southeastern part is correlated with the variegated Alzenau Fm. in the northwestern part of the Spessart Mts. The Alzenau Fm. forms a tectonic klippe, whereas the Schweinheim-Haibach Fm., the Orthogneiss Complex as well as the Mömbris and Geiselbach Fms. are exposed in a tectonic window. HT-mylonitic gneisses (“Plattengneise”) of the Elterhof Fm. suggest a tectonic contact between the Elternhof and Schweinheim-Haibach Fms. The Schweinheim-Haibach Fm. contains highly strained, fine-grained gneisses (i. e., the Haibach Gneiss) and might also be allochthonous. The whole structure represents a tectonic ramp structure with an out-of-sequence thrust of the Alzenau-Elterhof nappe (Figs. 1 and 2).

Keywords

Fault Zone Hanging Wall Fold Axis Late Ordovician Tectonic Window 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Springer-Verlag Berlin Heidelberg 1995

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  • K. Weber

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