Chemical Stratigraphy and Paleoceanography Illustrated by   Oxygen, Carbon and Strontium Isotopes of Shark Teeth Apatite
{'Code': '06030101', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'EAR', 'LongName': 'Division Of Earth Sciences'}}
{'SignBlockName': 'Jonathan H. Fink', 'PO_EMAI': None, 'PO_PHON': None}
Isotopic compositions are in widespread use to establish                   paleoceanographic conditions and geochemical stratigraphy even                  though there is scant evaluation of phosphate in modern oceans as               a reliable indicator of temperature based on oxygen isotopes or                 Sr ocean chemistry based on 87Sr86Sr ratios. This study will test               the usefulness of oxygen isotopic composition and 87Sr/86Sr ratio               of shark teeth to provide a direct measure of temperature and                   related climate of ancient biogenic phosphate.                                       Principal Investigators will evaluate isotope equilibria                   between shark tooth apatite and ocean water.  Modern species of                 sharks from well-known habitats will be used to determine the                   relationship of isotopic composition and ocean water and                        determine the effect of habitat on the isotope composition of                   apatite in modern sharks.  Accompanying determinations of the                   distribution of strontium, oxygen, and carbon isotopes in shark                 teeth and measurements of the isotopic composition of separated                 dentine and enameloid will document ecologic and diagenetic                     processes that effect the isotopic composition of shark teeth                   apatite.  This research will evaluate the utility of fossil                     shark's teeth as indicators of past environments and oceans.
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