Microscale data to macroscale processes: a review of microcharacterization applied to mineral systems

摘要: Microanalysis can provide rapid, quantitative characterization of mineral systems that complements the field- and core-scale observations traditionally made in ore deposits. We review recent innovations microanalytical procedures their application to studies Case are presented examining how microanalysis constraints on macroscopic processes within systems. Synchrotron X-ray fluorescence shows centimetre-scale chemical variations associated with proximity mineralization samples from Sunrise Dam Gold Mine, Western Australia. Pseudomorphs igneous plagioclase chemically driven recrystallization interpreted electron backscatter diffraction suggest system was dominated by fluid-driven brecciation very little shearing. Both fluid chemistry pressure evolved during a protracted sequence vein formation alteration accompanying gold mineralization. A second case study sulphide mineralogy at Mt Keith nickel deposit, Australia demonstrates computed tomography combined trace element mapping constrain dynamics magmatic Large-scale interaction between silicate melts, shown homogenous palladium enrichment pentlandite, leads large proportion globular ores high content. Increasing use deposit geology is resulting constant reassessment established models for genesis though combination micro- macroscale datasets.