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Yokoyama, Kazumi; Amano, Kazuo; Taira, Asahiko; Saito, Yasuji (1990): Mineralogy of silts from the Bengal Fan [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.756630, Supplement to: Yokoyama, K et al. (1990): Mineralogy of silts from the Bengal Fan. In: Cochran, JR; Stow, DAV; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 116, 59-73, https://doi.org/10.2973/odp.proc.sr.116.116.1990

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Abstract:
Early Miocene to Quaternary sediments drilled from the Bengal Fan are divided into six zones by modal proportions of heavy minerals. The sediments were mostly derived from the Himalayas. Detritus from the Indian subcontinent is found sporadically in clay-rich sediments that were deposited during periods of slow sedimentation, when the deep-sea channel migrated away from the drilled sites.
The oldest sediments, ranging from 17 to about 15 Ma, were derived mostly from the Precambrian and Paleozoic sedimentary rocks of the lower Himalayas. At about 15 Ma, metamorphic terrains were eroded in the source area. Further large-scale unroofing of metamorphic rocks occurred around 11 Ma. After 10 Ma, the major constituents in the drainage basin or the drainage pattern changed a few times. Between 3.5 and 0.5 Ma, a large peridotite body was unroofed by uplift and successive erosion of the central Himalayas. At this time, the single large river that had supplied detritus to the early Bengal Fan was divided into the Indus and Ganges rivers.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -0.972345 * Median Longitude: 81.395520 * South-bound Latitude: -1.020900 * West-bound Longitude: 81.390100 * North-bound Latitude: -0.929800 * East-bound Longitude: 81.401100
Date/Time Start: 1987-07-10T00:00:00 * Date/Time End: 1987-08-02T00:00:00
Event(s):
116-717A * Latitude: -0.929800 * Longitude: 81.390100 * Date/Time: 1987-07-10T00:00:00 * Elevation: -4747.0 m * Penetration: 9.5 m * Recovery: 9.64 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg116 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 9.5 m cored; 0 m drilled; 101.5 % recovery
116-717C * Latitude: -0.929800 * Longitude: 81.390100 * Date/Time: 1987-07-10T00:00:00 * Elevation: -4746.0 m * Penetration: 828.2 m * Recovery: 480.52 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg116 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 87 cores; 814.7 m cored; 0 m drilled; 59 % recovery
116-718C * Latitude: -1.020900 * Longitude: 81.401100 * Date/Time: 1987-07-20T00:00:00 * Elevation: -4741.0 m * Penetration: 935 m * Recovery: 274.05 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg116 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 98 cores; 925.7 m cored; 0 m drilled; 29.6 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets

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Datasets listed in this publication series

  1. Yokoyama, K; Amano, K; Taira, A et al. (1990): (Table 1) Modal proportions of heavy minerals at Bengal Fan sites. https://doi.org/10.1594/PANGAEA.756624
  2. Yokoyama, K; Amano, K; Taira, A et al. (1990): (Table 2) Modal proportions of light minerals at Bengal Fan sites. https://doi.org/10.1594/PANGAEA.756628