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Meredith, Jeffrey A; Tada, Ryuji (1992): Late Miocene cyclicity and intercore correlations for ODP Sites 127-794 and 127-797 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.778012, Supplement to: Meredith, JA; Tada, R (1992): Evidence for late Miocene cyclicity and broad-scale uniformity of sedimentation in the Yamato Basin, Sea of Japan, from formation microscanner data. 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), 1037-1046, https://doi.org/10.2973/odp.proc.sr.127128-2.224.1992

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Abstract:
During Leg 127, the formation microscanner (FMS) logging tool was used as part of an Ocean Drilling Program (ODP) logging program for only the second time in the history of the program. Resistivity images, also known as FMS logs, were obtained at Sites 794 and 797 that covered nearly the complete Yamato Basin sedimentary sequence to a depth below 500 mbsf. The FMS images from these two sites at the northeastern and southwestern corners of the Yamato Basin thus were amenable to comparison.
A strong visual correlation was noticed between the FMS logs taken in Holes 794B and 797C in an upper Miocene interval (350-384 mbsf), although the two sites are approximately 360 km apart. In this interval, the FMS logs showed a series of more resistive thin beds (10-200 cm) alternating with relatively lower resistivity layers: a pattern that was manifested by alternating dark (low resistivity) and light (high resistivity) banding in the FMS images. We attribute this layering to interbedding of chert and porcellanite layers, a common lithologic sequence throughout Japan (Tada and Iijima, 1983, doi:10.1306/212F82E7-2B24-11D7-8648000102C1865D). Spatial frequency analysis of this interval of dominant dark-light banding showed spatial cycles of period of 1.1 to 1.3 and 0.6 m. This pronounced layering and the correlation between the two sites terminate at 384 mbsf, coincident with the opal-CT to quartz transition at Site 794. We think the correlation in the FMS logs might well extend earlier in the middle Miocene, but the opal-CT to quartz transition obscures this layering below 384 mbsf.
Although 34 m is only a small part of the core recovered at these two sites, it is significant because it represents an area of extremely poor core recovery and an interval for which a near-depositional hiatus was postulated for Site 797, but not for Site 794.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 39.910178 * Median Longitude: 137.574111 * South-bound Latitude: 38.616000 * West-bound Longitude: 134.536000 * North-bound Latitude: 40.190000 * East-bound Longitude: 138.231000
Date/Time Start: 1989-06-30T12:15:00 * Date/Time End: 1989-08-18T17:00:00
Event(s):
127-794B * Latitude: 40.190000 * Longitude: 138.231000 * Date/Time Start: 1989-06-30T12:15:00 * Date/Time End: 1989-07-03T20:30:00 * Elevation: -2822.0 m * Penetration: 549 m * Recovery: 87.4 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 249.2 m cored; 0 m drilled; 35.1 % recovery
127-797B * Latitude: 38.616000 * Longitude: 134.536000 * Date/Time Start: 1989-07-31T20:00:00 * Date/Time End: 1989-08-04T17:00:00 * Elevation: -2874.0 m * Penetration: 495.7 m * Recovery: 370.69 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 495.7 m cored; 0 m drilled; 74.8 % recovery
127-797C * Latitude: 38.616000 * Longitude: 134.536000 * Date/Time Start: 1989-08-04T17:00:00 * Date/Time End: 1989-08-18T17:00:00 * Elevation: -2876.0 m * Penetration: 900.1 m * Recovery: 164.18 m * Location: Japan Sea * Campaign: Leg127 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 45 cores; 416.1 m cored; 0 m drilled; 39.5 % 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. Meredith, JA; Tada, R (1992): (Table 1) Correlation of core depths with log depths for key diagenetic horizons of ODP Sites 127-794 and 127-797. https://doi.org/10.1594/PANGAEA.778008
  2. Meredith, JA; Tada, R (1992): (Table 3) Correlation coefficients for selected intervals of ODP Holes 127-794B and 127-797C. https://doi.org/10.1594/PANGAEA.778011
  3. Meredith, JA; Tada, R (1992): (Table 2) Intervals of correlation between ODP Holes 127-794B and 127-797C. https://doi.org/10.1594/PANGAEA.778010