Are there regional changes in skeletal matter dissolution?
In view of regional variations in the decomposition of organic matter it is interesting to examine whether such changes occur in the dissolution of skeletal materials as well or not. Indeed regional differences have been found in the extent of carbonate and silicate mineral dissolutions in the NorthIndian Ocean. Higher amounts of carbonate minerals are found to dissolve in the northern and eastern areas than in southern and western regions of the Arabian Sea (Figure 16). Carbonate mineral dissolution is also higher in the Arabian Sea water column than that in the Bay of Bengal (George et al., 1994). These regional variabilities in carbonate dissolution in the North Indian Ocean are in excellent agreement with changes in the heterotrophic nature (intensity of bacterial activity during organic material decomposition). The heterotrophic or reducing nature, as stated in above sections, in the North Indian Ocean varies as: In the Arabian Sea: North > East > West > South In the Indian Ocean:
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