INTEGRATION OF STATISTICAL ANALYSIS OF GEOCHEMICAL DATA FROM HANDHELD XRF ANALYZER, ICP AND AAS WITH MINERALOGICAL TECHNIQUES (QEMSCAN ANALYSIS AND OPTICAL MICROSCOPY) TO CHARACTERIZE PARAGENESIS, HYDROTHERMAL ALTERATION AND MINERALIZATION IN A PORPHYRY COPPER-MOLYBDENUM DEPOSIT IN CHILE, SOUTH AMERICA
Hydrothermal alteration and lithology are analyzed using data acquired by a Handheld XRF analyzer, AAS and ICP-OES, and qualitative and quantitative mineralogy of the rock is characterized via core logging, petrographic techniques and Qemscan in Fieldscan mode. Qemscan gives modal mineralogy of samples, ore characterization, estimated grain and particle size, mineral association and elemental distribution. The description of alteration and lithology present at the site, in conjunction with analyses of bulk geochemical assay data using univariate and multivariate statistical tools allows linking the geochemical distribution of elements and certain qualitative and quantitative characteristics of the rock. A multivariate study is done to define relationships of elements, using the Handheld XRF analyzer, a rapid and low cost technique. These geochemical contrasts and ratios are analyzed to indicate a change in hydrothermal alteration, mineralization and lithology, supported by the mineralogical description, integrating macroscopic, petrographic and automated techniques. It aims to set the usefulness of a variety of techniques in conjunction to approach a better model of the deposit and analyze the feasibility of using data from the Portable X-Ray Fluorescence in lithogeochemistry.