Scholarly record
HYDROTHERMAL ALTERATION MAPPING USING REMOTE SENSING AND GIS IN STRZELIN MASSIF, SW POLAND - PRELIMINARY RESULTS
Abstract
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, prehnite, laumontite or kaolinite, calcite. Based on mineralogical composition and abundance (quantity and size) of the secondary minerals, four degrees of alteration (unaltered, slightly-, moderately- and strongly altered) are distinguished within the granitic body of Strzelin massif. Landsat 7 ETM + data were used to distinguish the lithological units and map the alteration zones from their host rocks, as prospective potential locations for mining important minerals. Data were processed through band ratioing and principal component analysis to highlight the hydrothermal alterations relevant to mineralisation within the study area. The TM band ratios 5/7, 3/1 and 5/4 were used to highlight clay mineral, iron oxide and ferrous oxide mineral alterations, respectively. Results of the image analysis in Google Earth Engine software were integrated in the ArcGIS environment and geoprocessed to obtain the alteration map of the Strzelin massif. Results were field validated. Remote sensing methods such as False Color Composites, Band Ratios, Principal Component Analysis and Spectral Classification proved useful in detecting alteration zones for potential mineral deposits.
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