Harrison, William E; Hesse, Reinhard; Gieskes, Joris M (1982): Interstitial water chemistry at DSDP Leg 67 Holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.817568, Supplement to: Harrison, WE et al. (1982): Relationship between sedimentary facies and interstitial water chemistry of slope, trench, and Cocos Plate Sites from the Middle America Trench Transect, Active Margin off Guatemala, Deep Sea Drilling Project Leg 67. In: Abouin, J; von Huene, R; et al. (eds.), Initial Reports of the Deep Sea Drilling Project (U.S. Govt. Printing Office), 67, 603-614, https://doi.org/10.2973/dsdp.proc.67.129.1982
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Abstract:
Interstitial water chemistry has proved to be a sensitive indicator for early diagenetic reactions, particularly those related to organic matter oxidation. Downhole chemical variations in the pore waters from Deep Sea Drilling Project Holes 496 and 497 on the Middle America Trench slope off Guatemala are anomalous because both salinity and chlorinity show strong decreases to half the values of seawater, and d18O values become positive (maximum of about +2.5% at the bottom of the holes). These observations are explained in terms of dilution of pore waters after retrieval as a result of decomposition of the gas hydrates before removal of pore waters by shipboard squeezing techniques. In all holes, except Hole 495 (drilled in pelagic sediments), decomposition of organic matter leads to rapid sulfate depletion and subsequent methane generation. Associated with methane generation are large increases in alkalinity and dissolved ammonia. The latter component causes ion exchange reactions with clay minerals, which results in maxima in magnesium and perhaps potassium. At greater depths, as yet unidentified reactions cause the removal of magnesium. Especially in the deeper Trench Sites 499 and 500, rapid variations in calcium, magnesium, and alkalinity occur in turbidite sequences.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 12.744188 * Median Longitude: -90.922142 * South-bound Latitude: 12.496300 * West-bound Longitude: -91.037700 * North-bound Latitude: 13.063700 * East-bound Longitude: -90.795200
Date/Time Start: 1979-05-17T00:00:00 * Date/Time End: 1979-06-18T00:00:00
Event(s):
67-494 * Latitude: 12.716700 * Longitude: -90.932800 * Date/Time: 1979-05-17T00:00:00 * Elevation: -5472.0 m * Penetration: 37.5 m * Recovery: 31.3 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 37.5 m cored; 0 m drilled; 83.5 % recovery
67-494A * Latitude: 12.716800 * Longitude: -90.932800 * Date/Time: 1979-05-17T00:00:00 * Elevation: -5472.0 m * Penetration: 366.5 m * Recovery: 91.3 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 329 m cored; 0 m drilled; 27.8 % recovery
67-495 * Latitude: 12.496300 * Longitude: -91.037700 * Date/Time: 1979-05-26T00:00:00 * Elevation: -4140.0 m * Penetration: 455.5 m * Recovery: 333.7 m * Location: North Pacific/TRENCH * Campaign: Leg67 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 446 m cored; 9.5 m drilled; 74.8 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Harrison, WE; Hesse, R; Gieskes, JM (1982): (Table 1) Interstitial water chemistry at DSDP Leg 67 Holes. https://doi.org/10.1594/PANGAEA.817566
- Harrison, WE; Hesse, R; Gieskes, JM (1982): (Table 2) Interstitial water chemistry at DSDP Leg 67 Holes. https://doi.org/10.1594/PANGAEA.817567