STABLE ISOTOPE SYSTEMATICS OF MANTLE PERIDOTITES IN THE     CONTEXT OF THEIR TECTONIC HISTORY
{'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}
It is generally agreed that fluids play a critical role in mantle               enrichment processes and that mantle enrichment events frequently               are superimposed in a complex manner on peridotitic mantle that                 has been depleted in incompatible trace elements and light rare-                earth elements through prior partial melting.  Chemical and                     radiogenic isotope data suggest that such metasomatic fluids may                be derived, in part, from recycled crustal materials and that                   some form of fluid metasomatism may be a necessary precursor to                 intraplate alkalic magmatism.                                                   Stable isotope studies provide a unique means of addressing                     mantle heterogeneity and enrichment/depletion processes because,                1) oxygen is a major element in terms of its behavior, whereas                  hydrogen is a trace element that is concentrated in aqueous fluid               phases, and 2) the mantle has been shown to be heterogeneous in                 terms of both its O- and H-isotope compositions.  This project                  will undertake a detailed stable isotope study of four regions in               which mantle peridotites of distinctly different petrological,                  chemical, and radiogenic isotope character have been erupted in                 Late Tertiary to Recent alkalic basalts.  The four gerions also                 are characterized by having sub-continental lithospheric mantle                 with differing tectonic histories.  The focus of the research is                an understanding of the causes of stable isotope variations in                  the different types of peridotites present within each region,                  and a comparison of the isotope systematics of peridotites from                 the four gegions in the context of their different tectonic                     histories.
{'FirstName': 'Russell', 'LastName': 'Harmon', 'PI_MID_INIT': 'S', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Russell S Harmon', 'EmailAddress': None, 'NSF_ID': '000112293', 'StartDate': '06/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Southern Methodist University', 'CityName': 'DALLAS', 'ZipCode': '752051902', 'PhoneNumber': '2147684708', 'StreetAddress': '6425 BOAZ ST RM 130', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Texas', 'StateCode': 'TX', 'CONGRESSDISTRICT': '24', 'CONGRESS_DISTRICT_ORG': 'TX24', 'ORG_UEI_NUM': 'D33QGS3Q3DJ3', 'ORG_LGL_BUS_NAME': 'SOUTHERN METHODIST UNIVERSITY', 'ORG_PRNT_UEI_NUM': 'S88YPE3BLV66'}
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{'Code': '1557', 'Text': 'VOLCANOLOGY & MANTLE GEOCHEMIS'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8708494.xml'}