Nishimura, Akira; Rodolfo, Kelvin S; Koizumi, Akiko; Gill, James B; Fujioka, Kantaro (1992): Chemistry of Pliocene-Pleistocene pumice from the Izu-Bonin Arc [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.771335, Supplement to: Nishimura, A et al. (1992): Episodic deposition of Pliocene-Pleistocene pumice from the Izu-Bonin Arc, Leg 126. In: Taylor, B; Fujioka, K; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 3-21, https://doi.org/10.2973/odp.proc.sr.126.115.1992
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Abstract:
Thick pumice deposits were found in the cored sequences of forearc, arc, and backarc sites of Leg 126 in the Izu-Bonin Arc. These deposits, composed of fragmental rhyolite pumice with the chemical composition of low-alkali tholeiites, are products of arc volcanism. Pumice deposits constitute more than half of the thickness of the sediment fill of the Sumisu Rift, a backarc rift of the Izu-Bonin Arc. They comprise five thick pumiceous beds separated by thin hemipelagic units; as such, they record four major episodes or pulses of explosive, rhyolitic volcanism during the last 0.15 Ma, separated by quiescent intervals that each lasted about 30-60 k.y. The thick pumiceous beds were deposited in the rift mainly by sediment gravity flows during and immediately after the eruption of arc volcanos, which were probably submarine. Initiation of rifting was also preceded in the Pliocene by submarine rhyolitic volcanism, as seen in samples from the top of the eastern rift flank. Thick pumice beds correlative with those in the backarc also occur in the forearc basin to the east.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 30.921778 * Median Longitude: 140.591577 * South-bound Latitude: 30.824500 * West-bound Longitude: 139.837000 * North-bound Latitude: 31.105700 * East-bound Longitude: 140.920000
Date/Time Start: 1989-03-31T17:30:00 * Date/Time End: 1989-05-27T18:10:00
Event(s):
125-785A * Latitude: 30.824500 * Longitude: 140.920000 * Date/Time Start: 1989-03-31T17:30:00 * Date/Time End: 1989-04-01T19:30:00 * Elevation: -2672.0 m * Penetration: 104.7 m * Recovery: 18.42 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 104.7 m cored; 0 m drilled; 17.6 % recovery
126-788C * Latitude: 30.922000 * Longitude: 140.003800 * Date/Time Start: 1989-05-14T01:20:00 * Date/Time End: 1989-05-15T03:15:00 * Elevation: -1113.0 m * Penetration: 262.5 m * Recovery: 146.15 m * Location: Philippine Sea * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 258.5 m cored; 0 m drilled; 56.5 % recovery
126-790B * Latitude: 30.916100 * Longitude: 139.844300 * Date/Time Start: 1989-04-30T06:30:00 * Date/Time End: 1989-05-01T11:15:00 * Elevation: -2234.0 m * Penetration: 138.9 m * Recovery: 88.69 m * Location: Philippine Sea * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 15 cores; 138.9 m cored; 0 m drilled; 63.9 % 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
- Nishimura, A; Rodolfo, KS; Koizumi, A et al. (1992): (Table 1) Petrography of pumice of ODP Leg 126 samples. https://doi.org/10.1594/PANGAEA.771333
- Nishimura, A; Rodolfo, KS; Koizumi, A et al. (1992): (Appendix) Chemical composition of pumice of ODP Leg 126 samples. https://doi.org/10.1594/PANGAEA.771334