An Isotopic and Petrologic Study of the Origin of Magmas of the San Juan Volcanic Field, Colorado
{'Code': '06030107', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John L. Snyder', 'PO_EMAI': None, 'PO_PHON': None}
The San Juan volcanic field is made up of about 25,000 cubic km.                of magma, making it one of the largest volcanic centers in the                  western U. S.  Exceptional exposures exist of pre-, syn-, and                   post-caldera lavas and ash-flow tuffs.  Little modern isotopic                  work has been done, and no Nd data exist for the field.  Workers                form six other institutions are currently involved in a variety                 of geologic studies.  Recently controversy has arisen as to the                 depth of origin of some ash-flow tuffs centered on the San Juan                 field, and isotopic data should help provide a resolution.                                                                                                      A comprehensive H, O, Sr, Nd, and Pb isotopic and petrologic                    study is planned, involving both lavas and ash-flow tuffs of the                central caldera complex.  The isotopic work will be aimed at                    understanding processes of magma formation and evolution, and                   will be firmly tied to field and petrologic data from this study                and the work of others.
{'FirstName': 'Clark', 'LastName': 'Johnson', 'PI_MID_INIT': 'M', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Clark M Johnson', 'EmailAddress': 'clarkj@geology.wisc.edu', 'NSF_ID': '000438802', 'StartDate': '06/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'University of Wisconsin-Madison', 'CityName': 'MADISON', 'ZipCode': '537151218', 'PhoneNumber': '6082623822', 'StreetAddress': '21 North Park Street', 'StreetAddress2': 'Suite 6301', 'CountryName': 'United States', 'StateName': 'Wisconsin', 'StateCode': 'WI', 'CONGRESSDISTRICT': '02', 'CONGRESS_DISTRICT_ORG': 'WI02', 'ORG_DUNS_NUM': '161202122', 'ORG_LGL_BUS_NAME': 'UNIVERSITY OF WISCONSIN SYSTEM', 'ORG_PRNT_DUNS_NUM': '041188822'}
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{'Code': '1557', 'Text': 'VOLCANOLOGY & MANTLE GEOCHEMIS'}
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