Crustal Reflection Profiling in Contrasting Archean Terrains in Minnesota:  The Oldest Crust in the U.S.
{'Code': '06030201', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Leonard E. Johnson', 'PO_EMAI': None, 'PO_PHON': None}
One of the biggest challenges facing earth scientists is to             decipher the nature and evolution of Archean crust, the greatest                crustal-forming episode involving questions of crustal thickness,               composition, horizontal vs. vertical tectonic regimes and evolution;            i.e., underplating, and crustal accretion.  COCORP (Consortium for              Continental Reflection Profiling data from Minnesota and its reanalysis         have provided new information on the nature of the Archean and raised           critical questions. Reinterpretation of the COCORP) data indicates a            moderately dipping suture between early and late Archean marked by a 2-         km-thick mylonite zone, a thrust faulted Animikie basin, and an ancient         gneiss terrain that is complexly folded on subhorizontal axial planes.          The subhorizontal folds continue to a depth of almost 30 km and pass            into a horizontal discontinuous structural regime in the lowermost crust        above a non-reflective Moho that may represent a phase change.  The             principal investigator proposes a comprehensive series of seismic               reflection recording experiments using 216 channels in two sets of              instruments simultaneously at near and wide-angel offsets.  Both the            shallow and lowermost crust will be imaged at offsets long enough to            determine velocities.  Crossing profiles will be recorded across the            ancient gneiss terrain, the Archean suture (GLTZ) and the Animikie              basin, and the lower crust and Moho will be a prime target.  Explosives         as well as vibrators will be used for wide-angle recording.  Research           will be carried out in cooperation with the Minnesota Geological Survey         who plan to drill shallow (100m) test holes to sample basement along the        seismic lines. Results will provide decisive new information on nature          and genesis of Archean crust.
{'FirstName': 'Scott', 'LastName': 'Smithson', 'PI_MID_INIT': 'B', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Scott B Smithson', 'EmailAddress': 'sbs@uwyo.edu', 'NSF_ID': '000315809', 'StartDate': '05/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Wyoming', 'CityName': 'LARAMIE', 'ZipCode': '820712000', 'PhoneNumber': '3077665320', 'StreetAddress': '1000 E UNIVERSITY AVE', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Wyoming', 'StateCode': 'WY', 'CONGRESSDISTRICT': '00', 'CONGRESS_DISTRICT_ORG': 'WY00', 'ORG_UEI_NUM': 'FDR5YF2K32X5', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF WYOMING', 'ORG_PRNT_UEI_NUM': 'FDR5YF2K32X5'}
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{'Code': '1581', 'Text': 'CONTINENTAL DYNAMICS PROGRAM'}
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