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Naka, Jiro; Tsugaru, Ryosuke; Danhara, Toru; Tanaka, Takeo; Fujioka, Kantaro (1993): Volcaniclastic sediments of ODP Leg 136 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.804929, Supplement to: Naka, J et al. (1993): Sedimentary processes of volcaniclastic sediments, Leg 136. In: Wilkens, RH; Firth, J; Bender, J; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 136, 85-95, https://doi.org/10.2973/odp.proc.sr.136.207.1993

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Abstract:
Sediment cores recovered from three holes drilled during Ocean Drilling Program Leg 136 include volcaniclastics probably derived from the Hawaiian islands. The volcaniclastics shallower than 10 meters below seafloor are fresh and are composed of basaltic glass (sideromelane), basaltic fragments (mainly tachylite), plagioclase, olivine, pyroxene, and opaque minerals. Most of these glasses are probably products of hydrovolcanism. Visibly, some of these volcaniclastics are recognized as bedded ash layers having thicknesses that range from 5 to 10 cm. However, many volcaniclastics are disrupted by bioturbation to some degree, and are sometimes totally mixed with ambient brown clays. No visible correlative ash layer among these holes was found. It seems that many ash layers thinner than the bedded layers were disrupted by bioturbation because of the low sedimentation rate of volcaniclastics.
The volcaniclastics were probably transported one of two ways: through air fall and pelagic settling or through turbidity-current transport. Other archipelagic apron volcaniclastic sediments of volcanic seamounts suggest that turbidite transport is the favored explanation of origin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 19.337400 * Median Longitude: -159.089633 * South-bound Latitude: 19.336000 * West-bound Longitude: -159.095000 * North-bound Latitude: 19.342000 * East-bound Longitude: -159.088000
Date/Time Start: 1991-03-03T11:15:00 * Date/Time End: 1991-03-18T00:00:00
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. Naka, J; Tsugaru, R; Danhara, T et al. (1993): (Table 2) Grain-size analysis of sediments of ODP Sites 136-842 and 136-843. https://doi.org/10.1594/PANGAEA.804921
  2. Naka, J; Tsugaru, R; Danhara, T et al. (1993): (Table 4) Results of reflective index analysis of basaltic volcanic glasses from ODP Sites 136-842 and 136-843. https://doi.org/10.1594/PANGAEA.804928
  3. Naka, J; Tsugaru, R; Danhara, T et al. (1993): (Table 1) Modal compositions of sediments of ODP Site 136-842. https://doi.org/10.1594/PANGAEA.804924
  4. Naka, J; Tsugaru, R; Danhara, T et al. (1993): (Table 3) Length and width of volcanic fragments from ODP Hole 136-842A. https://doi.org/10.1594/PANGAEA.804926