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High-temperature restite enclave as an evidence of deep seated parent magma melting of the Będkowska Valley granodirite (Silesian-Cracow area, South Poland)

Wolska A.

Annales Societatis Geologorum Poloniae

2004

Vol. 74, No 1

21-33

In the borehole DB-5, at a depth 1370.0 m dark micaceous enclave in granodiorite from Będkowska Valley was found. A sharp contact enclave/granodiorite is observed. The transition zone is irregularly developed around the enclave studied. It is a small enclave (3 x 6 cm), discoidal in shape. The microstructure of micaceous enclave is fine-blastic; crystalloblasts of rock-forming minerals are 0.2-0.5 mm in size. This enclave consists of: Fe-biotite (56-62 vol.%), plagioclase Ca-Na (34-40 vol.%), spinel (magnetite), corundum, and sericitic pseudo- morphs after cordierite. Its mineralogical composition is different from the Będkowska Valley granodiorite, what suggests that this rock is a medium/high-temperature restite. This rock represents residuum after partial melting of granodiorite magma in deep levels of basement of the Małopolska Massif.