Detailed mineralogical analyses in areas with surface hydrothermal alteration zones associated recent volcanism (<1 Ma) the Central Andean Volcanic Zone could provide key information to unravel presence of hidden geothermal systems. In Cordón de Inacaliri Complex, a field an estimated potential ~1.08 MWe·km?2 has been recently discovered. this work, we focus on and discharge products area, a...

Rare earth elements (REE) speciation in laterites are commonly estimated from sequential extraction procedure (SEP). In this study, the selectivity of a 5-steps SEP protocol was evaluated on individual synthetic Ce-material and applied to well-characterized lateritic profile developing over granite bedrock (Madagascar). The Ce-materials representative laterite minerals: Ce-doped oxyhydroxides k...

Mercury (Hg) release from inoperative Hg mines in the California Coast Range has been documented, but little is known about the release and transport mechanisms. In this study, tailings from Hg mines located in different geologic settings--New Idria (NI), a Si-carbonate Hg deposit, and Sulphur Bank (SB), a hot-spring Hg deposit--were characterized, and particle release from these wastes was stu...

Fluid conditions of shallow marine hydrothermal vent sites (<200 mbsl) in island arcs resemble those subaerial epithermal systems. This leads to a distinct mineralization-style compared deeper arc/back-arc (>200 and mid-ocean ridge-related environments (>2000 mbsl). At Calypso Vents the Bay Plenty Paleochori at coast Milos Island, fluids with temperatures <200°C are ...

The interplay between a heat source, primary plus secondary permeability, and hydrothermal fluids makes geothermal systems highly dynamic environment where evolving physico-chemical conditions are recorded in alteration mineralogy. A comprehensive characterization of is therefore essential to decipher the major processes associated with system development. In this study, we defined mineralogica...

Airborne hyperspectral data have been available to researchers since the early 1980s and their use for geologic applications is well documented. The launch of the National Aeronautics and Space Administration Earth Observing 1 Hyperion sensor in November 2000 marked the establishment of a test bed for spaceborne hyperspectral capabilities. Hyperion covers the 0.4–2.5m range with 242 spectral ba...