Carbonatite Genesis: The Example of the Oceanic Nephelinite-Phonolite-Carbonatite Volcanic Suite on Brava, Cape Verde   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 island of Brava, Cape Verdes, eshibits a Quaternary                         nepheline-phonolite-carbonatite pyroclastic sequence.  Eruptive                 styles of the dominant phonolites depart markedly from those                    typical of felsic magmas, and mapping the deposits will add to                  our knowledge of the eruptive behavior of highly alkaline magmas.               Phonolites are typically strongly depleted in rare-earth                        elements, and bear a complementary relationship to associated                   rare-earth-enriched carbonatite volcanics.  The most probable                   mechanism for this is the immiscible separation of a carbonatite                liquid from silicate magma, the carbonate being represented in                  the volcanic pile as carbonatite lavas and tuffs.  The phonolites               appear to be products of fractional crystallization via the line                of descent, olivine nephelinite - nephelinine - phonolite, but                  major questions remain, especially regarding the role of the                    sulphate feldspathoid nosean in phonolite geneses.  Petrogenetic                modelling will be based on mineral chemistry and major, trace                   element, and isotopic determinations of a suite of whole rocks                  and mineral separates from fresh pumice clasts in carefully                     studied pyroclastic units.  The close association of                            nephelinitic, basanitic, phonolitic and carbonatitic volcanic                   units at a well-exposed Quaternary center provides an unusual                   opportunity to advance understanding of the genesis and behavior                of carbonatite magmas, and their relationship to associated                     alkaline silicate magmas.
{'FirstName': 'John', 'LastName': 'Wolff', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'John A Wolff', 'EmailAddress': 'jawolff@wsu.edu', 'NSF_ID': '000373150', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Texas at Arlington', 'CityName': 'ARLINGTON', 'ZipCode': '760199800', 'PhoneNumber': '8172722105', 'StreetAddress': '701 S NEDDERMAN DR', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Texas', 'StateCode': 'TX', 'CONGRESSDISTRICT': '25', 'CONGRESS_DISTRICT_ORG': 'TX25', 'ORG_UEI_NUM': 'LMLUKUPJJ9N3', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF TEXAS AT ARLINGTON', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '155700', 'Text': 'VOLCANOLOGY & MANTLE GEOCHEMIS'}
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