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Langseth, Marcus G; Tamaki, Kensaku (1992): Geothermal measurements at ODP Leg 127 and 128 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.778238, Supplement to: Langseth, MG; Tamaki, K (1992): Geothermal measurements: thermal evolution of the Japan Sea Basins and Sediments. In: Tamaki, K; Suychiro, K; Allan, J; McWilliams, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 127/128(2), 1297-1309, https://doi.org/10.2973/odp.proc.sr.127128-2.227.1992

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Abstract:
Downhole temperature and thermal conductivity measurements in core samples recovered during Legs 127 and 128 in the Japan Sea resulted in five accurate determinations of heat flow through the seafloor and accurate estimates of temperature vs. depth over the drilled sections. The heat flows measured at these sites are in excellent agreement with nearby seafloor measurements. Drilling sampled basaltic rocks that form the acoustic basement in the Yamato and Japan basins and provided biostratigraphic and isotopic estimates of the age of these basins. The preliminary age estimates are compared with predicted heat flow values for two different thermal models of the lithosphere. A heat flow determination from the crest of the Okushiri Ridge yielded an anomalously high heat flow of 156 mW/m**2. This excessive heat flow value may have resulted from frictional heating on an active reverse fault that bounds the eastern side of the Ridge. Accurate estimates of sedimentation rates and temperatures in the sedimentary section combined with models of basin formation provide an opportunity to test thermochemical models of silica diagenesis. The current location of the opal-A/opal CT transition in the sedimentary section is determined primarily by the thermal history of the layer in which the transition is now found. Comparison of the ages and temperatures of the layer where the opal-A/opal-CT is found today is compatible with an activation energy of 14 to 17 kcal/mole.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 40.940956 * Median Longitude: 136.483878 * South-bound Latitude: 36.283300 * West-bound Longitude: 130.733300 * North-bound Latitude: 44.300000 * East-bound Longitude: 139.412500
Date/Time Start: 1989-07-12T00:00:00 * Date/Time End: 1989-10-13T00:00:00
Event(s):
127-795 * Latitude: 43.987000 * Longitude: 138.966000 * Date/Time Start: 1989-07-12T00:00:00 * Date/Time End: 1989-07-22T00:00:00 * Elevation: -3310.5 m * Penetration: 1128.1 m * Recovery: 447.2 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 80 cores; 761.9 m cored; 0 m drilled; 58.7% recovery
127-795A * Latitude: 43.987000 * Longitude: 138.967000 * Date/Time Start: 1989-07-12T20:15:00 * Date/Time End: 1989-07-16T00:00:00 * Elevation: -3311.0 m * Penetration: 365.9 m * Recovery: 258.26 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 39 cores; 364.9 m cored; 0 m drilled; 70.8 % recovery
127-796 * Latitude: 42.849000 * Longitude: 139.412500 * Date/Time Start: 1989-07-22T00:00:00 * Date/Time End: 1989-07-29T00:00:00 * Elevation: -2608.0 m * Penetration: 707.8 m * Recovery: 243.6 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 59 cores; 536.7 m cored; 0 m drilled; 45.4% recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Langseth, MG; Tamaki, K (1992): (Table 2) Geothermal parameters of Japan Sea samples. https://doi.org/10.1594/PANGAEA.778231
  2. Langseth, MG; Tamaki, K (1992): (Table 1) Geothermal measurements during ODP Legs 127 and 128. https://doi.org/10.1594/PANGAEA.778229
  3. Langseth, MG; Tamaki, K (1992): (Table 3) Age of acoustic basement and observed heat flow for ODP Leg 127/128 sites. https://doi.org/10.1594/PANGAEA.778232
  4. Langseth, MG; Tamaki, K (1992): (Table 4) Temperature and age of opal-A/opal-CT transition at ODP Leg 127/128 sites. https://doi.org/10.1594/PANGAEA.778237