High Precision 234U-230Th Dating of Corals and Marine       Chemistry of Rare Earth Elements, Actinide Elements and     Lead
{'Code': '06040200', 'Directorate': {'Abbreviation': 'GEO', 'LongName': 'Directorate For Geosciences'}, 'Division': {'Abbreviation': 'OCE', 'LongName': 'Division Of Ocean Sciences'}}
{'SignBlockName': 'Bilal U. Haq', 'PO_EMAI': None, 'PO_PHON': None}
Techniques have been developed for mass spectrometric                   determination of 234U and 230TH at the level of - 10 9 atoms to                 about 0.5% precision.  The time range over which useful age                     data on corals can be obtained now ranges from 50 to about                      500,000 years.  This methods will be applied to dating of                       corals and marine carbonates.  This method will be applied to                   dating of corals ad marine carbonates.  The main objectives are                 to determine the precise timing of the last interglacial period                 and study neotectonics.                                                                                                                                                 The investigators will also continue to study the marine                chemistry of rare earth elements (REE), actinide elements (ACE)                 and lead.  The results of these studies will improve our                        knowledge of the transport of these elements from the continent                 to the ocean and to the oceanic crust and the usefulness of                     these nuclides for the study of time scales of time important                   geological processes.
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{'Name': 'California Institute of Technology', 'CityName': 'PASADENA', 'ZipCode': '911250001', 'PhoneNumber': '6263956219', 'StreetAddress': '1200 E CALIFORNIA BLVD', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'California', 'StateCode': 'CA', 'CONGRESSDISTRICT': '28', 'CONGRESS_DISTRICT_ORG': 'CA28', 'ORG_UEI_NUM': 'U2JMKHNS5TG4', 'ORG_LGL_BUS_NAME': 'CALIFORNIA INSTITUTE OF TECHNOLOGY', 'ORG_PRNT_UEI_NUM': None}
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[{'Code': '1620', 'Text': 'Marine Geology and Geophysics'}, {'Code': '1670', 'Text': 'Chemical Oceanography'}]
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