Abstract
Abstract. Mixed siliciclastic-carbonate systems are globally distributed throughout the tropics, but have received limited research attention on active sedimentation. A detailed examination of sedimentation near La Parguera, Puerto Rico has been conducted to better understand this mixed system on the border of the Caribbean Sea, along the southwest coast of the island. This study includes an assessment of the sediment composition and texture of material accumulating on the La Parguera seabed, as well as an examination of excess 210Pb-activity profiles and accumulation rates. Variations in grain-size distribution and carbonate and loss-on-ignition (LOI) percentages are examined on the shelf. More specifically, an increase in carbonate percentage and a decrease in the LOI fraction in the seaward direction are evident. Excess 210Pb-activity profiles display steady-state and non-steady-state profiles. Steady-state profiles are most common and display a range of thicknesses in surface-mixed layers (3 - >20 cm)...
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