Abstract
Sequential phosphorus extractions were carried out to understand phosphorus cycling and enrichment in surface sediments along the eastern continental margin of India. Phosphorus associated with authigenic (P aut ) and biogenic (P bio ) phases is high by a factor of 2-10 in the continental shelf sediments compared to slope and deep-sea sediments. Phosphorus associated with Fe oxides (P Fe ) is enriched by a factor of 2-5 in the continental slope and rise sediments (500-3000 m water depth) compared to shelf sediments. Fe-Mn oxy(hydroxides) formed during early diagenesis adsorb phosphate from the water column or pore waters, thereby enriching the P Fe fraction in the continental slope sediments. These results are in contrast with those from the Arabian Sea, where wide and intense mid-depth oxygen minimum zone (150-1200 m water depth) releases P Fe to pore waters and enhances P aut accumulation in the continental slope sediments.
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