ALEUTIAN ARC MAGMATISM IN SPACE AND TIME: A GEOCHEMICAL     AND PETROLOGIC STUDY
{'Code': '06030107', 'Directorate': {'LongName': 'Directorate For Geosciences'}, 'Division': {'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John L. Snyder'}
Magmatic processes occurring over an entire island are crustal                  section are reflected in rock units found in the Aleutian arc,                  Alaska.  These processes assume more than local importance in                   that they have shaped a large proportion of terrane collagesw,                  and perhaps the continental crust in general.  In the Aleutian                  arc, most on-going magmatic studies emphasize recent volcanic                   rocks.  To complete the crustal cross-section, this project will                                                                                                focus on the more voluminous subvolcanic levels as represented                  by                                                                              plutons and xenolithic fragments.  Specific studies are proposed                                                                                                for plutonic xenoliths from Tertiary volcanic rocks on Kanaga                   Island and the Hidden Bay pluton on Adak Island in the central                  Aleutians.  These rock units indicate a buried oceanic crustal                  component in the Aleutian lithosphere and record details of the                                                                                                 processes of magmatic segregation in the crust.  In the western                                                                                                 Aleutians on Attu Island and in the Komandorski Islands (USSR),                 a                                                                               striking pattern of Tertiary magmatic evolution reflects changes                                                                                                in plate convergence.  On Attu, specific studies are planned to                                                                                                 study these changing magmatic conditions as reflected by                                                                                                        Oligocene rhyolites, lower-Miocene alkaline rocks, and upper-                                                                                                   Miocene calc-alkaline lavas.  The evolution of subcrustal magma                                                                                                 sources (including alkaline sources) and the crustal assimilation                                                                                               and fractional crystallization of calc-alkaline magmas intruding                                                                                                back-arc crust will be studied.  Analytical studies include                                                                                                     mineralogical analyses of major and trace elements as well as                                                                                                   isotopes (O, Sr, and Nd).  These are to be used uespectively as                                                                                                 tracers of physical conditions (P, T, volatile fugacities) and                                                                                                  isotopically distinct tectonic units.
[{'FirstName': 'Robert', 'LastName': 'Kay', 'EmailAddress': 'kay@geology.cornell.edu', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}, {'FirstName': 'Suzanne', 'LastName': 'Kay', 'EmailAddress': 'smk16@cornell.edu', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Co-Principal Investigator'}]
{'Name': 'Cornell University', 'CityName': 'Ithaca', 'ZipCode': '148502820', 'PhoneNumber': '6072555014', 'StreetAddress': '373 Pine Tree Road', 'CountryName': 'United States', 'StateName': 'New York', 'StateCode': 'NY'}
{'Code': '1557', 'Text': 'VOLCANOLOGY & MANTLE GEOCHEMIS'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8707577.xml'}