Creep of Pyroxene Single Crystals
{'Code': '06030204', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Michael A. Mayhew', 'PO_EMAI': None, 'PO_PHON': None}
A suite of high-temperature creep experiments will                         investigate the rheology of single crystals of clinopyroxene                    (diopside and hedenbergite) and orthopyroxene (bronzite and                     enstatite) under carefully-controlled thermodynamic conditions at               1 atm. total pressure, to determine intracrystalline flow laws and              mechanisms of deformation appropriate to these minerals for                     extrapolation to upper mantle conditions.  In particular, the                   dependence of creep rate on oxygen partial pressure and on the                  activity of silica will be measured.  Olivine is generally                      regarded as both the most abundant and weakest mineral in the                   upper mantle, so that the rheology of the upper mantle is usually               modelled using the results of high-temperature deformation                      experiments on olivine single crystals and polycrystals.  However,              in a chemically heterogeneous mantle, deformation in regions with               a locally high pyroxene content, such as subduction zones, will be              controlled by the deformation of pyroxenes.
{'FirstName': 'Stephen', 'LastName': 'Mackwell', 'PI_MID_INIT': 'J', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Stephen J Mackwell', 'EmailAddress': 'mackwell@lpi.usra.edu', 'NSF_ID': '000178490', 'StartDate': '06/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
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[{'Code': '1574', 'Text': 'Geophysics'}, {'Code': '1581', 'Text': 'CONTINENTAL DYNAMICS PROGRAM'}]
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