Development of Porosity Textures in Metamorphic Rocks
{'Code': '06030107', '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}
In interpreting metamorphic rocks, porosity is one of the                       textural elements which petrologists have largely ignored, even                 though mineral aggregate porosity textures can reveal important                 clues concerning the identity and interconnectivity of the                      metamorphic pore fluids.  The geometry of the mineral grain                     boundaries in natural rocks will be observed.  A series of                      experiments will also be run that will metamorphose rocks. These                experimentally-metamorphosed rocks will be analyzed for total                   porosity, porosity distribution, and dihedral angle geometry                    using  TEM, SEM and BSEM.  Measured dehedral angles will be                     correlated for differnet fluid chemistries and run durations and                compared to those for the naturally-metamorphosed samples.  In                  samples treated at low temperatures with H2O-NaCl, H2O-CaCl2 or                 H2O-FeCl3, the electron microprobe will be used to measure the                  Na, Ca, Fe and Cl distributions across the samples to document                  ionic, and hence, fluid, transport rates into the samples.  These               measurements will reveal whether fluids of different chemical                   composition will infiltrate rocks and form interconnected                       networks of fluid-permeated channels at metamorphic conditions.                 Such experiments will have significant implications for the                     interpretation of metamorphosing crustal regions and the                        potential for fine scale fluid percolation through metamorphic                  terrains.
[{'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': '01/01/1989', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}, {'FirstName': 'Susan', 'LastName': 'Brantley', 'PI_MID_INIT': 'L', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Susan L Brantley', 'EmailAddress': 'brantley@essc.psu.edu', 'NSF_ID': '000178235', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}]
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{'Code': '1573', 'Text': 'Petrology and Geochemistry'}
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