Andrews, J. E.; Dennis, P. F.; Greenaway, Anthony M.
Author Affiliation, Ana.
Department of Chemistry
Stable isotopic composition of dissolved inorganic carbon and sediment carbonate in Hunts Bay, Kingston Harbour
Jamaican Journal of Science and Technology
Date of Publication
A clearer understanding of sedimentation process in Hunts Bay has been obtained by consideration of inorganic carbon and oxygen stable isotope data. Within the Bay dissolved inorganic carbon (DIC) isotope data (d13C) conform to a marine/fresh water mixing model provided circulation patterns are recognized. Sediment isotope data show that river borne suspended materials dominate recently deposited sediment, while core samples show that both marine and terrestrial sources contributed prior to the water circulation restrictions which resulted from the building of the Causeway Bridge. The data do not appear to reflect significant syndepositional carbonate diagenesis and isotopic exchange with isotopically light CO2 from decomposing organic matter. Neither is there clear evidence for in situ CaCO3 precipitation contributing to carbonates in the sediment. The isotopically light DIC observed at the mouth of Kingston Harbour is explained by suggesting a very isotopically light terrestial carbon source (possibly methane) close to the mouth which enters a somewhat restricted harbour environment (possibly the Port Royal mangroves).....