Collaborative Research: 10Be and 9Be in Volcanic Arc Lavas: Investigation of Sediment Recycling
{'Code': '06030107', 'Directorate': {'LongName': 'Directorate For Geosciences'}, 'Division': {'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John L. Snyder'}
Recent measurements of Be-10 in ~250 volcanic rocks from various                geologic settings indicate that that young, near-surface oceanic                sediments are subducted and incorporated in arc magmas in the                   Kurile, Aleutian, Central America, Peru-Chile and New Britain                   arcs.  Integration of Be-10 data with geophysical and structural                studies of convergent margins suggests that sedfiments may be                   subducted in grabens in the subducting plate, as Be-10                          concentrations an arc lavas are highest where the pelagic sediment              thickness approximately equals vertical displacement of the down-               dropped basins.  Recent improvements in the University of                       Pennsylvania accelerator permit smaller samples to be analyzed                  more precisely, and the recent acqusition of an I.C.P.                          spectrometer at Carnegie permits measurement of Be-9.  This                     project is to measure Be-10/Be-9 ratios and Sr, Nd and Pb isotopic              compositions for mineral seperates, new volcanic arc lavas, and a               subset of the existing sample collection.  Wherever possible                    results will be combined with other geochemical studies and                     evaluated in the context of geophysical studies in order to arrive              at an integrated model of sediment subduction and recycling at                  volcanic arcs.
{'FirstName': 'Roy', 'LastName': 'Middleton', 'EmailAddress': 'jklein@dept.physics.upenn.edu', 'StartDate': '02/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Pennsylvania', 'CityName': 'Philadelphia', 'ZipCode': '191046205', 'PhoneNumber': '2158987293', 'StreetAddress': 'Research Services', 'CountryName': 'United States', 'StateName': 'Pennsylvania', 'StateCode': 'PA'}
{'Code': '1573', 'Text': 'PETROLOGY AND GEOCHEMISTRY'}
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