Citation:

s00410-006-0164-6

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Abstract:

Early arc volcanism during Eocene to Oligocene in the Izu forearc region was investigated during ODP Legs 125 and 126 in 1989, and effusive and intrusive volcanics were recovered from Leg 125 Site 786. These rocks were all classified into boninites and associated rocks by Leg 125 Shipboard Scientific Party, and they concluded that boninitic volcanism had occurred before 40 Ma, and arc tholeiitic volcanism began after 40 Ma. In this study, lava flows and breccias that classified into boninite series are divided into two groups, tholeiite and boninite, based on petrographical and petrological properties. Both series are also distinguished by bulk rock composition. It is considered that the sources of both rock types have similar depleted compositions because of their similar, very low bulk HFSE concentrations. We suggest that boninitic and tholeiitic volcanism occurred closely in time and space, and reflected different temperature and water condition.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 31.874200 * Longitude: 141.226500

Date/Time Start: 1989-04-04T12:00:00 * Date/Time End: 1989-04-16T17:00:00

Event(s):

125-786B * Latitude: 31.874200 * Longitude: 141.226500 * Date/Time Start: 1989-04-04T12:00:00 * Date/Time End: 1989-04-16T17:00:00 * Elevation: -3082.0 m * Penetration: 828.6 m * Recovery: 190.07 m * Location: North Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 72 cores; 666.1 m cored; 0 m drilled; 28.5 % recovery

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

9 datasets

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Datasets listed in this publication series

Haraguchi, S; Ishii, T (2007): (Table 2) Major element composition of clinopyroxene phenocrysts from rock type A of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668368
Haraguchi, S; Ishii, T (2007): (Table 2) Major element composition of orthopyroxene phenocrysts from rock type A of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668369
Haraguchi, S; Ishii, T (2007): (Table 2) Major element composition of plagioclase phenocrysts from rock type A of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668370
Haraguchi, S; Ishii, T (2007): (Table 3) Major element composition of clinopyroxene phenocrysts from rock type B of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668371
Haraguchi, S; Ishii, T (2007): (Table 3) Major element composition of orthopyroxene phenocrysts from rock type B of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668380
Haraguchi, S; Ishii, T (2007): (Table 3) Major element composition of plagioclase phenocrysts from rock type B of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668382
Haraguchi, S; Ishii, T (2007): (Table 5) Comparison of rock type classification from volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668385
Haraguchi, S; Ishii, T (2007): (Table 4) Representative analyzes of coexistance orthopyroxene and clinopyroxene phenocrysts composition, and estimated temperatures from volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668384
Haraguchi, S; Ishii, T (2007): (Table 1) Rock groups of volcanic basement from ODP Hole 125-786B, Izu forearc region, Philippine Sea. https://doi.org/10.1594/PANGAEA.668367