Rivers in the High Andes

Rivers in the High Andes

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Credit: FLETCHER & BAYLIS/SCIENCE PHOTO LIBRARY

Caption: The confluence of a near neutral stream, on the left, with a strongly acidic stream (pH around 3) that drains an oxidizing high-sulfidation epithermal gold deposit in Argentina. The brown color of the acidic stream is caused by precipitates of iron (ferric) hydroxides. The ridge in the distance is the crest of the Andes and the boundary between Argentina and Chile.

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Keywords: acid drainage, acidic stream, andes mountains, argentina, brown water, clear water, confluence, convergence, converging, different colors, earth science, ferric hydroxides, geochemistry, geography, geology, geomorphology, high andes, high sulfidation epithermal gold deposit, iron precipitate, joining, landform, landscape, leachate, leaching, meeting, merging, mixing, muddy river, neutral stream, oxidation, precipitation barrier, scenic, silt-laden, silty stream, south american, suspended sediment, volcanic-hydrothermal deposit, weathering

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