RUI:  Contrasting Differentiation Processes in Oceanic MagmaChambers:  Sierra Negra and Alcedo Volcanoes, Galapagos     Islands
{'Code': '06030107', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John L. Snyder', 'PO_EMAI': None, 'PO_PHON': None}
The Galapagos volcanoes Sierra Negra and Alcedo represent two                   extremes of magmatic diversity.  Sierra Negra is made up of                     compositionally similar, evolved tholeiitic basalts, whereas                    Alcedo has erupted a remarkable bimodal suite of tholeiitic                     basalts and oceanic rhyolites.  It is believed that the                         difference in the extents of differentiation of these two                       volcanoes is related to fundemental differences in their magma                  chambers' histories, yet the two are so close that their flanks                 overlap.  This project will perform detailed field, petrologic                  and geochemical studies of Alcedo volcano, in order to begin to                 elucidate these differences.  Particular emphasis will be placed                on determining the origin of the unique suite of oceanic                        rhyolites.  Volumes of the different units, their eruptive order,               and the locations of eruptions will be determined.  These in turn               will provide constraints on the petrologic processes that govern                the evolution of oceanic magmas.  Eventually it is planned to                   study Sierra Negra for comparison purposes, but such a study is                 not part of this project.
{'FirstName': 'Dennis', 'LastName': 'Geist', 'PI_MID_INIT': 'J', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Dennis J Geist', 'EmailAddress': 'dgeist@uidaho.edu', 'NSF_ID': '000435786', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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{'Code': '9120', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}
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