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2 Bulletin of the Polish Academy of Sciences. Earth Sciences

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Petrography and Geochemistry of Leptites from the Skrzynka Dislocation Zone (Eastern Sudetes, SW Poland) - Preliminary Results

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Wojciechowska I. , Ziółkowska-Kozdrój M. , Gunia P.

tom Vol. 49, nr 1

1-11

The first data on contents of trace and rare earth elements in leptitic rocks from the Złoty Stok-Skrzynka tectonic zone is given. They indicate that felsic volcaniclastic rocks such as tuffs or/and tuffites were the primary source materials for leptites. High contents of silica, potassium and sodium additionally confirm their derivation from rhyolitic protoliths possibly generated in a within plate palaeoenvironment.

Geochemistry of the "Haniak" gneisses and their metabasic enclaves (Złoty Stok - Skrzynka Tectonic Zone, Eastern Sudetes, SW Poland) - preliminary results

100%

Wojciechowska I. , Gunia P. , Ziółkowska-Kozdrój M.

Bulletin of the Polish Academy of Sciences. Earth Sciences

2000

tom Vol. 48, nr 1

45-60

Trace and REE element geochemistry of blastomylonites (known as the "Haniak gneisses") from north-western part of the Złoty Stok-Skrzynka Tectonic Zone (Eastern Sudetes) is reported for the first time. The obtained results indicate that source of primary material for blastomylonites might be the Gierałtów gneisses, the Śnieżnik gneisses or/and greywackes of the Stronie Unit. The enclaves of amphibolites included in blastomylonites display multielement profiles comparable with MORB-tholeiites or within-plate basalts, similarly as metabasites from the Śnieżnik-Orlica Dome. We suggest that the "Haniak gneisses" protolith represents a primary subcrustal granitic material which underwent progressive melting on different depth levels. We conclude that these processes were accompanied by enclosing of rock fragments derived from an earlier oceanic domain, probably along a suture zone.