Pageoph online dating rules consolidating subsidiaries
The West Sudetes form a mosaic composed of numerous of blocks of various origin, age and lithology.
Palaeomagnetic investigations performed so far for many of them, yielded a sufficient number of results (see references in Jeleńska 2003) that it was possible to construct of the Devonian—Permian fragment of the Western Sudetic Apparent Polar Wander Path (APWP) (Jeleńska 2003).
The Palaeozoic components of NRM are carried mainly by magnetite of several generations formed during several serpentinization episodes.
Permo-Carboniferous component (A1) present overall the Sudetes was isolated in one JGSM and two GSB exposures, whereas the Late Devonian–Early Carboniferous component (A2) was found in two exposures from the GSB.
Presence of fragments of GSB rocks in the Frasnian-Fammenian Świebodzice Basin sediments proves that during the Late Devonian the GSB were already accreted to the West Sudetes (Porȩbski 1990).
In the course of our study, we will correlate the results of palaeomagnetic and mineralogical investigations with the results of isotopic datings performed on rocks from both units (Brueckner 1996; O'Brien 1997; Bylina 2001; Dubińska 2004).The Sudetic Ophiolite probably represents a late stage extension of the Saxo-Thuringian Ocean and was accreted to the Sudetes in Late Devonian.The GSB unit is essentially composed of migmatitic gneisses and minor granulites; it contains numerous small basic and ultrabasic bodies, generally with obscured contacts with the host migmatitic gneisses.The GSB ultrabasic xenoliths include harzburgite-orthopyroxenite with minor melanocratic norite (CIPW norm).The composition and habit of a relict Cr-spinel and olivine (Fo90) assemblage unequivocally prove the depleted mantle origin of ultrabasic rocks from GSB (Dubińska 1999).