A preliminary petrographic study of the Chilean nitrates

Article Abstract:

The purity of the nitrate deposits found 3-5m below the surface of the Atacama Desert in Chile is due to natural processes of dissolution, reprecipitation and recyrstallization that concentrates the slightly soluble nitrate salts. The paragenetic sequences of the salts reveal the role played by various precipitating fluids during different stages of ore development. In the initial stages of salt depositions, groundwater was the primary precipitating fluid due to a temporary rise in the water-table level. Surface flooding provided the precipitating fluid and separated the soluble and the less soluble salts of nitrate, and resulted in the high quality of the ores.

Research, Chile, Nitrates, Petrology, Atacama Desert

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Seeing past the effects of re-equilibration to reconstruct magmatic gradients in plutons: La Gloria Pluton, central Chilean Andes

Article Abstract:

The geochemistry and petrology of the La Gloria pluton in the Southern Andes were analyzed to characterize the magmatic conditions and late magmatic re-equilibration processes that affect plutons. The La Gloria plutons exhibited variations in mineral compositions that was attributed to subsolidus requilibration and systematic gradients in magma composition. Furthermore, all the minerals in the La Gloria pluton exhibited textural and compositional evidence of less extensive subsolidus re-equilibration.

Analysis, Andes, Rocks, Igneous, Igneous rocks, Intrusions (Geology)

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General circulation modeling: past, present, and future: a symposium in honor of Akio Arakawa

Article Abstract:

The American Meteorological Society held a symposium on Jan 20-22, 1998 in Los Angeles, CA, to honor University of California, Los Angeles Prof Akio Arakawa. Arakawa was one of the foremost authorities in the field of atmospheric general circulation model development. A salient quality of his work was his capability to provide key contributions both to the development of numerical methods and to the development of new physical parameterization.

Conferences, meetings and seminars, Appreciation, Atmospheric circulation, Meteorologists, American Meteorological Society, Arakawa, Akio

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