Petrogenesis of Triassic Intrusions, SW Maine:  Forerunners of WMMS Igneous Activity
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{'SignBlockName': 'Jane M. Ernst', 'PO_EMAI': None, 'PO_PHON': None}
Anorogeneic igneous activity during the Mesozoic in New                    England was a long-lived and petrologically varied magmatic                     event.  Three major pulses of magmatism are recognized: (1) an                  early Triassic phase, (2) a spatially restricted and voluminous                 Jurassic pulse, and (3) a regionally extensive Cretaceous phase.                Modern petrologic investigations have concentrated on two later                 phases; petrogenetic conclusions vary from simple crustal                       anatexis to combined crustal assimilation and fractional                        crystallization (AFC) of mafic, mantle-derived magmas.  In                      contrast, the earliest phase of activity, the Triassic event, has               been petrochemically ignored.  Exposed only in SW Maine, this                   activity is primarily represented by the Mt. Agamenticus complex                (alkaline syenite to granite) and the Abbott Mountain stock                     (syenite).  Using modern petrochemical techniques and                           geochronology (phase petrology, major, trace, and rare earth                    element geochemistry, Sr, Pb, and Nd isotope geochemistry, and                  40Ar/39Ar isotope geochronology) the proposed research will                     carefully characterize these intrusions and develop comprehensive               petrogenetic solutions.  Preliminary results suggest that                       crustal anatexis and not AFC of mafic magmas is important in the                genesis of these plutons.  If so, then this Triassic magmatic                   event may be similar to the later Jurassic pulse and can be                     considered the forerunner of that activity.  Comparison of                      petrogenetic models developed for all of the Mesozoic igneous                   events should increase our understanding of the evolution of this               'anorogenic' magmatism and provide better constraints on the                    nature of the tectono/thermal activity that was is ultimate                     cause.
{'FirstName': 'Wallace', 'LastName': 'Bothner', 'PI_MID_INIT': 'A', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Wallace A Bothner', 'EmailAddress': 'wbothner@christa.unh.edu', 'NSF_ID': '000087398', 'StartDate': '01/01/1989', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of New Hampshire', 'CityName': 'DURHAM', 'ZipCode': '038242620', 'PhoneNumber': '6038622172', 'StreetAddress': '51 COLLEGE RD', 'StreetAddress2': 'BLDG 107', 'CountryName': 'United States', 'StateName': 'New Hampshire', 'StateCode': 'NH', 'CONGRESSDISTRICT': '01', 'CONGRESS_DISTRICT_ORG': 'NH01', 'ORG_UEI_NUM': 'GBNGC495XA67', 'ORG_LGL_BUS_NAME': 'UNIVERSITY SYSTEM OF NEW HAMPSHIRE', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '1572', 'Text': 'Tectonics'}
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