. Collected reprints, Essa Institute for Oceanography. Oceanography 116 GEORGE H. KELLER AND ADRIAN F. RICHARDS. 96 98 100 102 104 96 98 100 102 104 Fig. 12.—Surface distribution of calcium carbonate, shell, foraminifera, and organic carbon, Malacca Strait and adjacent Andaman Sea. southeast. The shelf break is a distinct divide between the high-test concentrations in the Andaman Sea and the relatively low abundance in the strait. The tongue-like area of forami- niferal tests projecting into the strait from the Andaman Sea is attributed to the environ- ment caused by the wedge of
. Collected reprints, Essa Institute for Oceanography. Oceanography 116 GEORGE H. KELLER AND ADRIAN F. RICHARDS. 96 98 100 102 104 96 98 100 102 104 Fig. 12.—Surface distribution of calcium carbonate, shell, foraminifera, and organic carbon, Malacca Strait and adjacent Andaman Sea. southeast. The shelf break is a distinct divide between the high-test concentrations in the Andaman Sea and the relatively low abundance in the strait. The tongue-like area of forami- niferal tests projecting into the strait from the Andaman Sea is attributed to the environ- ment caused by the wedge of cool, high salinity bottom water that also extends from the Anda- man Sea into this region (fig. 8). Organic Matter.—Duplicate organic carbon de- terminations were made using the potassium dichromate-ferrous ammonium sulfate titration method of Allison (1935). The values obtained are only approximate because this method is based on the assumption that all organic matter in sediments is at the same state of oxidation. Percentages of organic carbon range from to The lowest concentrations are found in the area of maximum current velocity between Port Swettenham and Malacca (fig. 12). A fair cor- relation exists between the areal distribution of grain size and organic carbon; low organic car- bon normally is associated with the coarser sediments. High organic carbon content along portions of the coastal margin reflects the in- fluence of river discharge. This is particularly evident in the Southern region and north of Penang Island. Isolated areas of relatively high organic carbon also occur where organic matter has collected in topographic depressions. A pro- nounced deficiency of organic carbon occurs along the shelf break where the currents tend to winnow away the finer material. Organic carbon percentage increases beyond the continental shelf towards the Andaman Basin. Nitrogen content was determined for 77 sur- face samples using a modified micro-Kjeldahl metho
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