Stosunek granitoidów jawornickich do deformacji metamorfiku lądecko-śnieżnickiego

Abstract

Zanalizowano stosunek przestrzenny granitoidów jawornickich do poszczególnych generacji mezostruktur ich osłony metamorficznej. Wyniki przeprowadzonych obserwacji sugerują możliwość przesunięcia głównego fałdowania w metamorfiku lądecko-śnieżnickim do karbonu.

THE RELATION OF JAWORNIK GRANITOIDS TO DEFORMATIONS OF LĄDEK-ŚNIEŻNIK METAMORPHIC AREA

The studies carried out by the present author in the areas of Orłowiec and Jawornik, eastern Sudety Mts, have shown that veins of Jawornik granitoids are concordant with the direction of metamorphic foliation S₂, that is younger that the deformation stage F₁ marked in the rocks of the Lądek-Śnieżnik metamorphic by relic intrafoliational mesofolds. Granitoid venis are folded concordantly with schist-gneiss complex of their metamorphic cover according to similar, isoclinals mesofolds F₂ with vertical axial surfaces and open, asymmetric folds F₃ of the concentric type.

Two stages of formation of granitoids are distinguished: first, directly preceding deformation F₂, and second, syngenetic with deformation F₃. Younger, overprinted deformations are represented by folds of the kink band type and often conjugate. These deformations, denoted as F₄ and F₅ by the present author, are younger than the granitoids despite of the fact that they are also related to the Hercynian tectogenesis. If the Jawornik granitoids represent Hercynian igneous metamorphic cycle, as it is indicated by the results of radiometric datings, it appears necessary to assume that the main folding of the Lądek - Śnieżnik metamorphic took place earlier than it was hitherto assumed, i.e. in the Carboniferous.