Fujioka, Kantaro; Nishimura, Akira; Matsuo, Yoshiko; Rodolfo, Kelvin S (1992): Petrology and geochemistry of Quaternary tephras of the Izu-Bonin Arc [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.770486, Supplement to: Fujioka, K et al. (1992): Correlation of Quaternary tephras throughout the Izu-Bonin areas. In: Taylor, B; Fujioka, K.; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 23-45, https://doi.org/10.2973/odp.proc.sr.126.116.1992
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Abstract:
Quaternary marine tephras in the Izu-Bonin Arc offer significant information about explosive volcanic activities of the arc. Visual core descriptions, petrographic examinations, and chemical and grain-size analyses were conducted on tephras of backarc, arc, and forearc origin. Tephras are black and white and occur in simple and multiple modes with mixed and nonmixed ashes of black and white glass shards. The grain size distributions of the tephras are classified into three categories: coarse, white pumiceous, and fine white and black well-sorted types. The frequency of occurrence of the white and black tephras differs within the tectonic settings of the arc. Chemically, the Quaternary tephras in this region belong to low-alkali tholeiitic series with lower K2O and TiO2 than normal ordinary arc volcanic materials. Several tephras from different sites along the forearc correlate with each other and with tephras in the Shikoku Basin site and with Aogashima volcanics. These volcanic ashes resemble those in other backarc rifting areas, such as in the Fiji, Okinawa (Ryukyu), and Mariana regions.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 30.915419 * Median Longitude: 139.881718 * South-bound Latitude: 30.910900 * West-bound Longitude: 139.837000 * North-bound Latitude: 30.922000 * East-bound Longitude: 140.003800
Date/Time Start: 1989-04-29T00:00:00 * Date/Time End: 1989-05-15T03:15:00
Event(s):
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
126-790 * Latitude: 30.914133 * Longitude: 139.841733 * Date/Time Start: 1989-04-29T00:00:00 * Date/Time End: 1989-05-04T00:00:00 * Elevation: -2233.7 m * Penetration: 563.4 m * Recovery: 251.7 m * Location: Philippine Sea * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 52 cores; 478.4 m cored; 0 m drilled; 52.6% recovery
126-790A * Latitude: 30.915400 * Longitude: 139.843900 * Date/Time Start: 1989-04-29T15:56:00 * Date/Time End: 1989-04-30T06:30:00 * Elevation: -2233.0 m * Penetration: 37.4 m * Recovery: 35.71 m * Location: Philippine Sea * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 37.4 m cored; 0 m drilled; 95.5 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets
Download Data
Datasets listed in this publication series
- Fujioka, K; Nishimura, A; Matsuo, Y et al. (1992): (Table 2) Petrographic characteristics of backarc tephras of ODP Sites 126-790 and 126-791. https://doi.org/10.1594/PANGAEA.770481
- Fujioka, K; Nishimura, A; Matsuo, Y et al. (1992): (Table 1) Volcanic ash layers at ODP Site 126-790. https://doi.org/10.1594/PANGAEA.770477
- Fujioka, K; Nishimura, A; Matsuo, Y et al. (1992): (Appendix) Geochemistry of ODP Leg 126 tephra samples. https://doi.org/10.1594/PANGAEA.770484
- Fujioka, K; Nishimura, A; Matsuo, Y et al. (1992): (Table 3) Grain-size analyses for ODP Leg 126 samples. https://doi.org/10.1594/PANGAEA.770482