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- W2049397553 endingPage "323" @default.
- W2049397553 startingPage "305" @default.
- W2049397553 abstract "Benthic biogeochemical processes in the oceans’ oxygen minimum zones (OMZs) are of global significance, yet they remain poorly defined. Here, sedimentary manganese, iron, and sulphur cycling are studied at sites above, within and below the OMZ on the Pakistan margin of the Arabian Sea, before and immediately after the Southwest Monsoon. Mechanisms and rates of sedimentary Mn, Fe, and S cycling demonstrated down-slope variation according to the position of the OMZ. No significant seasonal change was evident, except at one station on the upper margin, where bottom-waters became hypoxic during the late-to-post-monsoon sampling, due to the shoaling of the upper OMZ boundary. Within the OMZ, Mn4+ reduction within the water column limited supply of reactive Mn to the underlying sediments. The majority of reactive Mn reaching the sedimentary environment is reduced abiotically, via reaction with Fe2+. Sediments within the OMZ act as a source of Mn2+ to the overlying water. Below the OMZ, Mn2+ is re-oxidised within the water column and is deposited on the surface of the underlying sediments. Manganese is then reduced microbially, and re-oxidised within the oxygenated surface sediments. Uniform surface–sediment Fe/Al ratios across the margin suggest that Fe3+ reduction is lacking within the water column OMZ. In contrast, Fe is actively cycled within the sediments, with Fe3+ reduction occurring via dissimilatory pathways. An absence of potential Fe2+ oxidants within the OMZ results in an efflux of Fe2+ from the sediments to the water column. Below the OMZ, greater oxidant availability ensures that Fe is retained within the sediments. Measured sulphate reduction rates at all sites across the margin were surprisingly low (0–0.45 mmol m−2 d−1) relative to rates observed on other OMZ margins. The abundance of Fe-oxides in the sedimentary environment appears to suppress sulphate reduction." @default.
- W2049397553 created "2016-06-24" @default.
- W2049397553 creator A5010704745 @default.
- W2049397553 creator A5015105396 @default.
- W2049397553 creator A5019684111 @default.
- W2049397553 creator A5050031123 @default.
- W2049397553 creator A5051658436 @default.
- W2049397553 creator A5060921439 @default.
- W2049397553 date "2009-03-01" @default.
- W2049397553 modified "2023-10-17" @default.
- W2049397553 title "Manganese, iron, and sulphur cycling on the Pakistan margin" @default.
- W2049397553 cites W1225678252 @default.
- W2049397553 cites W1512098610 @default.
- W2049397553 cites W1560853515 @default.
- W2049397553 cites W1568166854 @default.
- W2049397553 cites W1586239332 @default.
- W2049397553 cites W1667213644 @default.
- W2049397553 cites W1896194870 @default.
- W2049397553 cites W193264372 @default.
- W2049397553 cites W1964266011 @default.
- W2049397553 cites W1965210221 @default.
- W2049397553 cites W1968372973 @default.
- W2049397553 cites W1970465286 @default.
- W2049397553 cites W1974611066 @default.
- W2049397553 cites W1975061192 @default.
- W2049397553 cites W1976145625 @default.
- W2049397553 cites W1978377557 @default.
- W2049397553 cites W1978743166 @default.
- W2049397553 cites W1982404483 @default.
- W2049397553 cites W1983648672 @default.
- W2049397553 cites W1985809588 @default.
- W2049397553 cites W1989319080 @default.
- W2049397553 cites W1990611318 @default.
- W2049397553 cites W1999108161 @default.
- W2049397553 cites W2000358695 @default.
- W2049397553 cites W2001156023 @default.
- W2049397553 cites W2001213305 @default.
- W2049397553 cites W2003295260 @default.
- W2049397553 cites W2003680290 @default.
- W2049397553 cites W2005990125 @default.
- W2049397553 cites W2009397204 @default.
- W2049397553 cites W2010282358 @default.
- W2049397553 cites W2013398329 @default.
- W2049397553 cites W2014279454 @default.
- W2049397553 cites W2016073970 @default.
- W2049397553 cites W2020722679 @default.
- W2049397553 cites W2021947786 @default.
- W2049397553 cites W2022965257 @default.
- W2049397553 cites W2023068580 @default.
- W2049397553 cites W2032555995 @default.
- W2049397553 cites W2034240887 @default.
- W2049397553 cites W2034557601 @default.
- W2049397553 cites W2036197570 @default.
- W2049397553 cites W2038281478 @default.
- W2049397553 cites W2041292141 @default.
- W2049397553 cites W2043668123 @default.
- W2049397553 cites W2044233272 @default.
- W2049397553 cites W2048829317 @default.
- W2049397553 cites W2049854718 @default.
- W2049397553 cites W2050206681 @default.
- W2049397553 cites W2053716921 @default.
- W2049397553 cites W2054645658 @default.
- W2049397553 cites W2056392157 @default.
- W2049397553 cites W2056865910 @default.
- W2049397553 cites W2059109340 @default.
- W2049397553 cites W2059589790 @default.
- W2049397553 cites W2061440945 @default.
- W2049397553 cites W2067787027 @default.
- W2049397553 cites W2069156503 @default.
- W2049397553 cites W2069829917 @default.
- W2049397553 cites W2069934447 @default.
- W2049397553 cites W2070161393 @default.
- W2049397553 cites W2072081886 @default.
- W2049397553 cites W2077208675 @default.
- W2049397553 cites W2077711976 @default.
- W2049397553 cites W2077974641 @default.
- W2049397553 cites W2079517750 @default.
- W2049397553 cites W2080745486 @default.
- W2049397553 cites W2082250875 @default.
- W2049397553 cites W2083315693 @default.
- W2049397553 cites W2084376607 @default.
- W2049397553 cites W2084429208 @default.
- W2049397553 cites W2085166727 @default.
- W2049397553 cites W2085529060 @default.
- W2049397553 cites W2086933696 @default.
- W2049397553 cites W2100049728 @default.
- W2049397553 cites W2100132779 @default.
- W2049397553 cites W2132284252 @default.
- W2049397553 cites W2132581380 @default.
- W2049397553 cites W2134162597 @default.
- W2049397553 cites W2139312273 @default.
- W2049397553 cites W2142462683 @default.
- W2049397553 cites W2148447501 @default.
- W2049397553 cites W2148879597 @default.
- W2049397553 cites W2154403411 @default.
- W2049397553 cites W2160668852 @default.
- W2049397553 cites W2162291034 @default.
- W2049397553 cites W2164513556 @default.