Granitoids of the Odra Fault Zone: late- to post-orogenic Variscan intrusions in the Saxothuringian Zone, SW Poland

• Autorzy: Oberc-Dziedzic T. , Żelaźniewicz A. , Cwojdziński S.
• Języki publikacji: EN

Abstrakty

EN

There are 5 occurrences of granodioritic to monzogranitic rocks found subsurface along the Odra Fault Zone a Permo-Mesozoic horst defining the northeastern edge of the Bohemian Massif. These are generally unfoliated, I-type granitoids with low A/CNK and initial Sr/Sr ratios making them geochemically and petrographically akin to late- to post-kinematic Variscan granitoids of the West Sudetes, being closest to those of the eastern part of the Fore-Sudetic Block (Strzelin, Niemcza). They represent late/post-orogenic, collisional intrusives of Early-Late Carboniferous age which are widespread throughout the Saxothuringian and Moldanubian zones in the Bohemian Massif. The country rocks to the granitoids are mica schists and paragneisses attaining staurolite-grade. The granitoids lack evidence of ductile or brittle strike-slip movement of Late Carboniferous-Permian age along the Odra Fault Zone, which thus has to be taken as a dip-slip fault zone, rather than a late Variscan dextral strike-slip feature. Brittle to semi-brittle deformation of the Odra granitoids relates to the formation of the horst during Permo-Mesozoic times. A Silurian-Early Devonian magmatic arc of the Mid-German Crystalline Rise, identified further to the west in Germany, probably does not have an easterly prolongation into Poland because there is no evidence for arc-related magmatism of that age in the Sudetes and Fore-Sudetic Block.

Słowa kluczowe

EN

Fore-Sudetic Block; granitoid; Mid-German Crystalline Rise; Odra Fault Zone; Saxothuringian Zone Variscides; Sudetes

• Wydawca: Instytut Nauk Geologicznych PAN ; Instytut Nauk Geologicznych Uniwersytetu Wrocławskiego
• Czasopismo: Geologia Sudetica
• Rocznik: 1999
• Tom: Vol. 32, nr 1
• Strony: 55--71

Twórcy

autor

Oberc-Dziedzic T.

autor

Żelaźniewicz A.

autor

Cwojdziński S.

• Instytut Nauk Geologicznych, Uniwersytet Wrocławski, M. Borna 9, 50-204 Wrocław, Poland