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Schoonmaker Tribble, Jane (1990): Bulk and clay mineralogy of ODP Leg 110 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.746675, Supplement to: Schoonmaker Tribble, J (1990): Clay diagenesis in the barbados accretionary complex: potential impact on hydrology and subduction dynamics. In: Moore, JC; Mascle, A; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 110, 97-110, https://doi.org/10.2973/odp.proc.sr.110.131.1990

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Abstract:
The mineralogy of both bulk- and clay-sized fractions of samples from Sites 671, 672, and 674 of ODP Leg 110 was determined by X-ray diffraction. The major minerals include quartz, calcite, plagioclase feldspar, and the clay minerals smectite, illite, and kaolinite. The smectite is a dioctahedral montmorillonite and is derived primarily from degradation of volcanic ash. Percentage of smectite varies with sediment age; Miocene and Eocene sediments are the most smectite-rich. High smectite content tends to correlate with elevated porosity, presumably because of the ability of smectite clays to absorb significant amounts of interlayer water. Because of a change in physical properties, the decollement zone at Site 671 formed in sediments immediately subjacent to a section of smectite-rich, high-porosity, Miocene-age sediments.
Sediments above the decollement at Site 671, as well as all sediments analyzed from Sites 672 and 674, contain nearly pure smectite characteristic of the alteration of volcanic ash. Within the decollement zone and underthrust sequence, however, the smectite contains up to 65% illite interlayers. Although the illite/smectite could be interpreted as detrital clay derived from South America, its absence in the sediments stratigraphically equivalent to the decollement and underthrust sequences at Sites 672 and 674 favors the interpretation that it originated by diagenetic alteration of pre-existing smectite similar to that in the overlying sediments. A significant percentage of the freshening of the pore waters observed in these zones could be due to the water released during smectite dehydration.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 15.534667 * Median Longitude: -58.741667 * South-bound Latitude: 15.525800 * West-bound Longitude: -58.851500 * North-bound Latitude: 15.540000 * East-bound Longitude: -58.641000
Date/Time Start: 1986-06-28T12:45:00 * Date/Time End: 1986-08-03T07:45:00
Event(s):
110-671B * Latitude: 15.525800 * Longitude: -58.732500 * Date/Time Start: 1986-06-28T12:45:00 * Date/Time End: 1986-07-10T23:15:00 * Elevation: -4942.0 m * Penetration: 691.2 m * Recovery: 553.13 m * Location: South Atlantic Ocean * Campaign: Leg110 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 74 cores; 691.2 m cored; 0 m drilled; 80 % recovery
110-672A * Latitude: 15.540000 * Longitude: -58.641000 * Date/Time Start: 1986-07-15T11:10:00 * Date/Time End: 1986-07-22T12:15:00 * Elevation: -4984.0 m * Penetration: 493.8 m * Recovery: 382.62 m * Location: South Atlantic Ocean * Campaign: Leg110 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 493.8 m cored; 0 m drilled; 77.5 % recovery
110-674A * Latitude: 15.538200 * Longitude: -58.851500 * Date/Time Start: 1986-07-28T14:00:00 * Date/Time End: 1986-08-03T07:45:00 * Elevation: -4561.0 m * Penetration: 452.6 m * Recovery: 354.58 m * Location: South Atlantic Ocean * Campaign: Leg110 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 48 cores; 452.6 m cored; 0 m drilled; 78.3 % 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. Schoonmaker Tribble, J (1990): (Table 1) Bulk and clay mineralogy of ODP Hole 110-671B. https://doi.org/10.1594/PANGAEA.746671
  2. Schoonmaker Tribble, J (1990): (Table 2) Bulk and clay mineralogy of ODP Hole 110-672A. https://doi.org/10.1594/PANGAEA.746672
  3. Schoonmaker Tribble, J (1990): (Table 3) Bulk and clay mineralogy of ODP Hole 110-674A. https://doi.org/10.1594/PANGAEA.746673