Fujioka, Kantaro; Matsuo, Yoshiko; Nishimura, Akira; Koyama, Masato; Rodolfo, Kelvin S (1992): Petrology and geochemistry of the Izu-Bonin Forearc tephras [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.770523, Supplement to: Fujioka, K et al. (1992): Tephras of the Izu-Bonin Forearc (Sites 787, 792, and 793). In: Taylor, B; Fujioka, K.; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 126, 47-74, https://doi.org/10.2973/odp.proc.sr.126.117.1992
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Abstract:
Numerous marine tephra layers cored at Sites 792 and 793 in the Izu-Bonin forearc region offer additional information about the timing and spatial characteristics of arc volcanism and the evolution of island arcs. Explosive volcanism along the Izu-Bonin Arc, with maxima just before rifting of the arc at ~40 and 5-0 Ma, produced black and white tephras of variable grain sizes and chemical compositions. Most of the tephras belong chemically to low-K and low-alkali tholeiitic rock series with a few tephra of the high-K and alkalic rock series. Most of the tephras (low-K series) were derived from the Izu-Bonin Arc, although a few were produced far to the west of the Izu-Bonin Arc (e.g., from the Ryukyu Arc). Black tephras may have come from nearby sources, such as Aogashima, Sumisu, and Torishima islands. The high-K series of tephras, within the sediments younger than 3 Ma, may reflect thickening of the island-arc crust.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 32.018671 * Median Longitude: 140.529887 * South-bound Latitude: 31.105700 * West-bound Longitude: 140.379300 * North-bound Latitude: 32.399800 * East-bound Longitude: 140.888200
Date/Time Start: 1989-05-17T01:36:00 * Date/Time End: 1989-05-27T18:10:00
Event(s):
126-792A * Latitude: 32.399800 * Longitude: 140.380700 * Date/Time Start: 1989-05-17T01:36:00 * Date/Time End: 1989-05-17T17:25:00 * Elevation: -1798.0 m * Penetration: 95 m * Recovery: 72.09 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 10 cores; 95 m cored; 0 m drilled; 75.9 % recovery
126-792B * Latitude: 32.399800 * Longitude: 140.380700 * Date/Time Start: 1989-05-17T17:25:00 * Date/Time End: 1989-05-18T08:10:00 * Elevation: -1798.0 m * Penetration: 146.4 m * Recovery: 43.59 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 11 core; 100.7 m cored; 0 m drilled; 43.3 % recovery
126-792C * Latitude: 32.399100 * Longitude: 140.380100 * Date/Time Start: 1989-05-18T08:10:00 * Date/Time End: 1989-05-18T17:45:00 * Elevation: -1798.0 m * Penetration: 146.4 m * Recovery: 0.59 m * Location: North Pacific Ocean * Campaign: Leg126 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 9.6 m cored; 0 m drilled; 6.1 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Fujioka, K; Matsuo, Y; Nishimura, A et al. (1992): (Appendix B) Chemical composition of the tephra layers of ODP Site 126-792 and 126-793. https://doi.org/10.1594/PANGAEA.770522
- Fujioka, K; Matsuo, Y; Nishimura, A et al. (1992): (Appendix A) Grain size analyses of tephra layers of ODP Site 126-792 and 126-793. https://doi.org/10.1594/PANGAEA.770521
- Fujioka, K; Matsuo, Y; Nishimura, A et al. (1992): (Table 3) Petrographic characteristics of tephra layers from the Izu-Bonin Forearc ODP sites. https://doi.org/10.1594/PANGAEA.770520