Accretion and Core Formation in the Earth: Evidence from    Siderophile and Chalcophile Trace Elements
{'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}
This project will investigate the accretion of the Earth and the                seperation of the Earth's core and crust from the mantle by                     analyzing geochemically well-characterized samples from different               geochemical reservoirs.  Neutron activation analysis will be used               for the moderately siderophile and chalcophile trace elements                   Mo, W, As, and Sb.  The abundances of highly siderophile elements               in the mantle are not consistent with equilibrium between the                   core and mantle, as would be expected assuming completely                       homogenous accretion of the Earth.  The varying depletions                      relative to elements with different affinities for Fe-metal or                  sulfide provide clues to the events involving accretion and metal               segregation in the mantle, including the possibility of late                    veneers that accreted on the Earth after core formation, or the                 possibility of metal retention in the mantle during core                        formation.  Determining the abundances and depletion of these                   elements in samples of different geological ages will also                      address the timing of core formation in the Earth, beacuse the                  possibility of continued core formation through a substantial                   portion of geologic time has been invoked to explain some of the                recent lead isotope results for samples from the mantle.
{'FirstName': 'Horton', 'LastName': 'Newsom', 'PI_MID_INIT': 'E', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Horton E Newsom', 'EmailAddress': 'newsom@unm.edu', 'NSF_ID': '000444723', 'StartDate': '06/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of New Mexico', 'CityName': 'ALBUQUERQUE', 'ZipCode': '87131', 'PhoneNumber': '5052774186', 'StreetAddress': '1700 LOMAS BLVD NE STE 2200', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'New Mexico', 'StateCode': 'NM', 'CONGRESSDISTRICT': '01', 'CONGRESS_DISTRICT_ORG': 'NM01', 'ORG_UEI_NUM': 'F6XLTRUQJEN4', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF NEW MEXICO', 'ORG_PRNT_UEI_NUM': None}
{'Name': None, 'CityName': None, 'StateCode': None, 'ZipCode': None, 'StreetAddress': None, 'CountryCode': None, 'CountryName': None, 'StateName': None, 'CountryFlag': None, 'CONGRESSDISTRICT': None, 'CONGRESS_DISTRICT_PERF': '""'}
[{'Code': '155700', 'Text': 'VOLCANOLOGY & MANTLE GEOCHEMIS'}, {'Code': '157500', 'Text': 'EDUCATION AND HUMAN RESOURCES'}, {'Code': '912000', 'Text': 'CROSS-DIRECTORATE PROGRAMS'}]
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8804070.xml'}