Argentina 8 mineral deposit Ammonium anomalies 4 Mining exploration guide 4 SWIR reflectance spectroscopy 4 South America 4 ammonium 4 basalt 4 chronology 4 clay mineral 4 detection method 4 host rock 4 hydrothermal alteration 4 identification method 4 infrared spectroscopy 4 mineral exploration 4 mining 4 potassium 4 reflectance 4 stratigraphy 4 sulfate 4 volcaniclastic deposit 4