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The investigated area comprises Strzelin massif, located in the SW Poland. Strzelin massif is built mainly by granitoids and metamorphic rocks. The chemical-, mineral- and textural composition of the Strzelin granite were altered by hydrothermal fluids that migrated along fissures, caverns, microfractures, cleavage planes and grain interstices. The alterations manifest themselves mainly as bleached zones filled by hydrothermal minerals in the following order: quartz, feldspars, muscovite, chlorite, clinozoisite, p...