Emeis, Kay-Christian; Morse, John W (1990): Organic chemistry of sediments of the Peru margin. PANGAEA, https://doi.org/10.1594/PANGAEA.753643, Supplement to: Emeis, K-C; Morse, JW (1990): Organic carbon, reduced sulfur, and iron relationships in sediments of the Peru margin, sites 680 and 688. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 441-453, https://doi.org/10.2973/odp.proc.sr.112.151.1990
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Organic-carbon-rich anoxic sediments from the continental shelf (Site 680) and the lower continental slope (Site 688) off Peru were studied to determine factors controlling the accumulation of reduced sulfur. High concentrations of organic matter in diatomaceous muds, its thermal immaturity, and the presence of abundant hydrogen-containing organic compounds lead to the conclusion that organic matter is not limiting for reduced sulfur formation. Rather, high degrees of iron pyritization at Site 680 limit pyrite accumulation in sediments from this shelf site. The low degree of iron pyritization and nearly complete reduction of dissolved sulfate at Site 688 suggest that a lack of interstitial sulfate is limiting pyrite formation there. Although factors that limit the formation of sedimentary iron sulfide are different at each site, the resulting average reduced-sulfur concentrations are remarkably similar (0.85 wt.% at Site 680 and 0.86 wt.% at Site 688). Carbon to sulfur (C/S) ratios are higher in samples containing in excess of 3 wt.% organic carbon than the average of 2.8 in normal marine sediments and have been primarily influenced by variations in organic matter concentrations.
Median Latitude: -11.301415 * Median Longitude: -78.510665 * South-bound Latitude: -11.538000 * West-bound Longitude: -78.944170 * North-bound Latitude: -11.065000 * East-bound Longitude: -78.077830
Date/Time Start: 1986-11-05T07:15:00 * Date/Time End: 1986-12-18T09:00:00
112-680A * Latitude: -11.065000 * Longitude: -78.077830 * Date/Time Start: 1986-11-05T07:15:00 * Date/Time End: 1986-11-05T20:30:00 * Elevation: -272.0 m * Penetration: 93.8 m * Recovery: 81.19 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 93.8 m cored; 0 m drilled; 86.6 % recovery
112-688A * Latitude: -11.537660 * Longitude: -78.942830 * Date/Time Start: 1986-12-05T17:15:00 * Date/Time End: 1986-12-07T02:30:00 * Elevation: -3827.0 m * Penetration: 350.3 m * Recovery: 245.29 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 350.3 m cored; 0 m drilled; 70 % recovery
112-688E * Latitude: -11.538000 * Longitude: -78.944170 * Date/Time Start: 1986-12-10T23:15:00 * Date/Time End: 1986-12-18T09:00:00 * Elevation: -3827.0 m * Penetration: 779 m * Recovery: 151.98 m * Location: South Pacific Ocean * Campaign: Leg112 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 46 cores; 429 m cored; 0 m drilled; 35.4 % recovery