High Resolution Secular Variation in Oxygen, Carbon,        Strontium Isotopic Composition
{'Code': '06030101', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'John A. Maccini', 'PO_EMAI': None, 'PO_PHON': None}
This research will document the magnitude, rates and relative              timing of change among numerous isotopic (18O, 13C, 87Sr/86Sr)                  and elemental (Li/A1) tracers through the Devono-Carboniferous                  interval.  This period in Earth's history, which is marked by a                 dramatic shift in 18O and 13C of marine carbonates records either               a dramatic decrease in global surface temperature of 30-40                      degree, or an enrichment in 18O composition of seawater.  Paired                analysis of chemical tracers will be performed on non-biological                marine carbonates from Devono-Carboniferous reefal sequences of                 the Dinant Synclinorium (Belgium) - Waulsortian Sequence of                     Ireland and the time equivalent succession of the Alberta Basin to              test the hypothesis that a shift in ocean 18O composition was                   caused by an increase in 18O flux associated with enhanced                      hydrothermal alteration at submarine spreading ridges.                               Analysis of 87Sr/86Sr variation will provide insight on                    relative contributions from mantle versus crustal sources; Li/Al                ratios will record the increasing versus decreasing dominance of                high temperature, hydrothermal alteration versus low temperature                submarine weathering of mantle-derived basalts.  Specific goals of              the research include:  (1) evaluation of correlations, in time and              magnitude, of variation among chemical tracers to determine                     whether they are responding to a common geologic process; (2)                   determination of empirical time constants of change in chemistry                to constrain the magnitude of elemental fluxes into an out of the               ocean; and (3) quantitative modelling, based on empirical                       relationships, to assess the role of seawater cycling through mid-              ocean ridge basalt in defining the 18O composition of the                       paleocean.
{'FirstName': 'Kyger', 'LastName': 'Lohmann', 'PI_MID_INIT': 'C', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Kyger C Lohmann', 'EmailAddress': 'kacey@umich.edu', 'NSF_ID': '000370573', 'StartDate': '02/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Regents of the University of Michigan - Ann Arbor', 'CityName': 'ANN ARBOR', 'ZipCode': '481091079', 'PhoneNumber': '7347636438', 'StreetAddress': '1109 GEDDES AVE, SUITE 3300', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Michigan', 'StateCode': 'MI', 'CONGRESSDISTRICT': '06', 'CONGRESS_DISTRICT_ORG': 'MI06', 'ORG_UEI_NUM': 'GNJ7BBP73WE9', 'ORG_LGL_BUS_NAME': 'REGENTS OF THE UNIVERSITY OF MICHIGAN', 'ORG_PRNT_UEI_NUM': None}
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{'Code': '1571', 'Text': 'SCEC'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8721315.xml'}