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Natland, James H; Hekinian, Roger (1982): Geochemistry at DSDP Site 60-456 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.820687, Supplement to: Natland, JH; Hekinian, R (1982): Hydrothermal alteration of basalts and sediments at Deep Sea Drilling Project Site 456, Mariana Trough. In: Hussong, DM; Uyeda, S; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 60, 759-767, https://doi.org/10.2973/dsdp.proc.60.144.1982

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Abstract:
Basalts in two holes spaced 200 meters apart at DSDP Site 456 in the Mariana Trough both show a downward sequence of nonoxidative and oxidative zones of alteration, each 10 to 15 meters thick, overlying fresh basalts. Basalts in the nonoxidative zone have been extensively chloritized and have vein and vesicle fillings of quartz, opal, chlorite, calcite, and pyrite. Minor sulfides are chalcopyrite and digenite. Basalts in the oxidative zone have abundant smectites and iron hydroxides and are variably enriched in K, Rb, and Ba, unlike the nonoxidative basalts above them. We propose that the oxidative zone was a zone of mixing between high-temperature, reduced hydrothermal fluids moving horizontally beneath impermeable sediments at the top of the pillowed basement lavas and cold, oxygenated seawater in interpillow voids deeper in the basement. Recrystallized vitric tuffs immediately above the basalts containing authigenic quartz and wairakite, as well as occurrence of chlorite, epidote, and chalcopyrite in the basalts, suggest temperatures of alteration in excess of 200°C.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 17.911550 * Median Longitude: 145.180400 * South-bound Latitude: 17.911300 * West-bound Longitude: 145.179500 * North-bound Latitude: 17.911800 * East-bound Longitude: 145.181300
Date/Time Start: 1978-04-12T00:00:00 * Date/Time End: 1978-04-12T00:00:00
Event(s):
60-456 * Latitude: 17.911300 * Longitude: 145.179500 * Date/Time: 1978-04-12T00:00:00 * Elevation: -3586.0 m * Penetration: 169 m * Recovery: 32.4 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg60 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 18 cores; 159.5 m cored; 9.5 m drilled; 20.3 % recovery
60-456A * Latitude: 17.911800 * Longitude: 145.181300 * Date/Time: 1978-04-12T00:00:00 * Elevation: -3586.0 m * Penetration: 159 m * Recovery: 37.5 m * Location: North Pacific/SEDIMENT POND * Campaign: Leg60 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 139.5 m cored; 0 m drilled; 26.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Natland, JH; Hekinian, R (1982): (Table 1) Geochemistry of plagioclases at DSDP Site 60-456. https://doi.org/10.1594/PANGAEA.820684
  2. Natland, JH; Hekinian, R (1982): (Table 3) Geochemistry of sulfides at DSDP Hole 60-456. https://doi.org/10.1594/PANGAEA.820686
  3. Natland, JH; Hekinian, R (1982): (Table 2) Geochemistry of chlorites and sphenes at DSDP Hole 60-456A. https://doi.org/10.1594/PANGAEA.820685