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Use of strontium isotopes to constrain the timing and mode of dolomitization of upper Cenozoic sediments in a core from San Salvador, Bahamas

Journal Article · · Geology; (United States)
; ;
The /sup 87///sup 86/Sr ratios and the activity ratios of /sup 234/U//sup 238/U and /sup 230/Th//sup 238/U have been measured in dolomites from a 168-m-deep core taken on the island of San Salvador, Bahamas. These data suggest two periods of dolomitization. The first episode dolomitized Miocene age sediments during the latest Miocene, and the second dolomitized the Pliocene portion of the core and was still active as recently as 150 ka. The late timing of the second episode argues against penecontemporaneous models of dolomitization for the Pliocene sediments. Instead, dolomitization is favored either as a result of mixing-zone development during the large Pleistocene sea-level changes or by movement of seawater through the platform.
Research Organization:
Univ. of Miami, FL (USA)
OSTI ID:
5237476
Journal Information:
Geology; (United States), Journal Name: Geology; (United States) Vol. 15:3; ISSN GLGYB
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
580100* -- Geology & Hydrology-- (-1989)
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
AGE ESTIMATION
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ALPHA DECAY RADIOISOTOPES
BAHAMA ISLANDS
BETA DECAY RADIOISOTOPES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CENOZOIC ERA
DEVELOPING COUNTRIES
DOLOMITE
DRILL CORES
ELECTRON CAPTURE RADIOISOTOPES
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC HISTORY
HEAVY NUCLEI
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
ISLANDS
ISOMERIC TRANSITION ISOTOPES
ISOTOPE DATING
ISOTOPES
LEVELS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALIZATION
MINERALS
MIOCENE EPOCH
NUCLEI
OXYGEN COMPOUNDS
PLEISTOCENE EPOCH
PLIOCENE EPOCH
QUATERNARY PERIOD
RADIOISOTOPES
SEA LEVEL
SEAWATER
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
TERTIARY PERIOD
THORIUM 230
THORIUM ISOTOPES
TRANSPORT
URANIUM 234
URANIUM 238
URANIUM ISOTOPES
WATER
WEST INDIES
YEARS LIVING RADIOISOTOPES