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Hiscott, Richard N; Colella, Albina; Pezard, Philippe A; Lovell, Michael A; Malinverno, Alberto (1992): Sedimentology of ODP Leg 126 deep-water volcaniclastics [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.771449, Supplement to: Hiscott, RN et al. (1992): Sedimentology of deep-water volcaniclastics, Oligocene Izu-Bonin Forearc Basin, based on formation microscanner images. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 75-76, https://doi.org/10.2973/odp.proc.sr.126.118.1992

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Abstract:
Three sites were drilled in the Izu-Bonin forearc basin during Ocean Drilling Program (ODP) Leg 126. High-quality formation microscanner (FMS) data from two of the sites provide images of part of a thick, volcaniclastic, middle to upper Oligocene, basin-plain turbidite succession. The FMS images were used to construct bed-by-bed sedimentary sections for the depth intervals 2232-2441 m below rig floor (mbrf) in Hole 792E, and 4023-4330 mbrf in Hole 793B. Beds vary in thickness from those that are near or below the resolution of the FMS tool (2.5 cm) to those that are 10-15 m thick. The bed thicknesses are distributed according to a power law with an exponent of about 1.0. There are no obvious upward thickening or thinning sequences in the bed-by-bed sections. Spaced packets of thick and very thick beds may be a response to (1) low stands of global sea level, particularly at 30 Ma, (2) periods of increased tectonic uplift, or (3) periods of more intense volcanism.
Graded sandstones, most pebbly sandstones, and graded to graded-stratified conglomerates were deposited by turbidity currents. The very thick, mainly structureless beds of sandstone, pebbly sandstone, and pebble conglomerate are interpreted as sandy debris-flow deposits. Many of the sediment gravity flows may have been triggered by earthquakes. Long recurrence intervals of 0.3-1 m.y. for the very thickest beds are consistent with triggering by large-magnitude earthquakes (M = 9) with epicenters approximately 10-50 km away from large, unstable accumulations of volcaniclastic sand and ash on the flanks of arc volcanoes.
Paleocurrents were obtained from the grain fabric of six thicker sandstone beds, and ripple migration directions in about 40 thinner beds; orientations were constrained by the FMS images. The data from ripples are very scattered and cannot be used to specify source positions. They do, however, indicate that the paleoenvironment was a basin plain where weaker currents were free to follow a broad range of flow paths. The data from sandstone fabric are more reliable and indicate that turbidity currents flowed toward 150 infinity during the time period from 28.9 to 27.3 Ma. This direction is essentially along the axis of the forearc basin, from north to south, with a small component of flow away from the western margin of the basin.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 31.968237 * Median Longitude: 140.548900 * South-bound Latitude: 31.105910 * West-bound Longitude: 140.379300 * North-bound Latitude: 32.399400 * East-bound Longitude: 140.888100
Date/Time Start: 1989-05-19T04:55:00 * Date/Time End: 1989-06-17T18:55:00
Event(s):
126-792E * Latitude: 32.399400 * Longitude: 140.379300 * Date/Time Start: 1989-05-19T04:55:00 * Date/Time End: 1989-05-26T06:40:00 * Elevation: -1798.0 m * Penetration: 885.9 m * Recovery: 362.07 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 78 cores; 750.3 m cored; 0 m drilled; 48.3 % recovery
126-793B * Latitude: 31.105910 * Longitude: 140.888100 * Date/Time Start: 1989-05-27T18:10:00 * Date/Time End: 1989-06-17T18:55:00 * Elevation: -2975.0 m * Penetration: 1682 m * Recovery: 697.94 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 114 cores; 1095.5 m cored; 0 m drilled; 63.7 % 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. Hiscott, RN; Colella, A; Pezard, PA et al. (1992): (Table 1) Bed-thickness frequency in ODP Holes 126-792E and 126-793B. https://doi.org/10.1594/PANGAEA.771444
  2. Hiscott, RN; Colella, A; Pezard, PA et al. (1992): (Table 3) Ripple forest dips and numerical rankings in ODP Holes 126-792E and 126-793B. https://doi.org/10.1594/PANGAEA.771448
  3. Hiscott, RN; Colella, A; Pezard, PA et al. (1992): (Table 2) Grain fabric of sanstone beds in ODP Hole 126-792E. https://doi.org/10.1594/PANGAEA.771445