Factors Affecting Base Metal Mobility in Subseafloor        Hydrothermal Systems
{'Code': '06040302', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'OCE', 'LongName': 'Division Of Ocean Sciences'}}
{'SignBlockName': 'Nicholas Anderson', 'PO_EMAI': 'nanderso@nsf.gov', 'PO_PHON': '7032924715'}
Salt water at relatively low pressures and near super critical                  temperatures appears to play a prominent role in sub>.>seafloor                 alternation process at mid>.>ocean ridges.  Experimental data for               the solubility of key alternation minerals, especially sulfides                 and aluminosilicates, however, are conspicuously lacking for                    these conditions.  The low pressure supercritical region of                     seawater (3.2% NaCl) is characterized by physical parameters                    (density,dielectric constant) which changes dramatically with                   slight change in pressure complicating aqueous                                  activity>.>concentration relations, mineral>.>fluid equilibria, and             theoretical models of rock>.>fluid interaction. Experiments are                 designed to assess the solubility and reactivity of sphalerite                  and chalcopyrite, and plagioclase and epidote respectively in pH                and redox buffered, NaCl fluids in the low pressure supercritical               region.  Results of the experiments will (1) allow predictions of               metal concentrations to be made from more sophisticated models;                 (2) define the role of chloride ion controlling fluid pH; and (3)               specify phase relationships of minerals that can measure                        temperature and/or pressure at mid>.>ocean ridges.
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{'Code': '1670', 'Text': 'Chemical Oceanography'}
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