Occurrence of the sandstone included in the alkali-basalt lava flow from the western Mineoka Belt, Boso Peninsula, Japan, and its tectonic significance.

Hirano, Naoto; Okuzawa, Koichi

doi:10.5575/geosoc.108.11_691

Cited by 11 publications

(8 citation statements)

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“…Dolerite dikes are coarse-grained with the general strike of N 60-80°W and GANBAT ET AL. Hirano & Okuzawa, 2002) and characterized by WPB geochemistry. We collected 34 core samples from a small size river outcrop with two distinct lithologies: Gray basalts and red basalts and one sample (BM010422-07) from red basalts for age dating.…”

Section: Sampling Sitesmentioning

confidence: 99%

“…10.1029/2020JB021492 7 of 27 Enomoto et al, 2018;Hirano & Okuzawa, 2002;Hirano et al, 2003;Ichiyama et al, 2017;Mori et al, 2011. References used for Shimanto Belt: Aoki et al, 2007;Aoki et al, 2011;Hara & Kimura, 2008;Hasebe & Tagami, 2001;Itaya et al, 2011;Raimbourg et al, 2017, Sakai, 1988…”

Section: Geology Of the Mineoka Ophiolite Mélange (Mom)mentioning

confidence: 99%

“…N-MORB-normal mid-ocean ridge basalt; E-MORB-enriched mid-ocean ridge basalt; OIB-ocean island basalt; OIA-ocean island alkaline; WPB-within plate basalt; IAB-island arc basalt; CAB-calc-alkaline basalt. Data compiled from Hirano & Okuzawa, 2002;Hirano et al, 2003;Mori et al, 2011;Ogawa et al, 2009 Site-III: QWS (Quarry Western Sengen) -Outcrop of 100 m long pillow basalt block is located 500 m to the northwest from Mt. Mineoka-Sengen, along the Heguri River (Figure 2).…”

Section: Sampling Sitesmentioning

confidence: 99%

“…It occurs as sheet flows and vesicular pillow basalt and sections of basaltic clastic sandstone, conglomerate, glauconitic shale, micritic limestone, and siliceous shale overlie it. It extruded at 19.62 ± 0.90 Ma [MSWD = 0.93] (bulk‐rock 40 Ar/ 39 Ar plateau age; Hirano & Okuzawa, 2002) and characterized by WPB geochemistry. We collected 34 core samples from a small size river outcrop with two distinct lithologies: Gray basalts and red basalts and one sample (BM010422‐07) from red basalts for age dating.…”

Section: Sampling Sites and Lithological Variationsmentioning

confidence: 99%

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Cretaceous to Miocene NW Pacific Plate Kinematic Constraints: Paleomagnetism and Ar–Ar Geochronology in the Mineoka Ophiolite Mélange (Japan)

et al. 2021

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East Asia has witnessed the birth and demise of oceanic plates at least, during the latest 500 million years. Subduction of numerous oceanic plates: Eurasian (Amur), Pacific, North America (Okhotsk), Indo-Australia, Caroline, and Philippine Sea plates formed a complex collage of ophiolites, volcanic arcs, orogenic belts, and continental fragments (i.e., terranes, blocks, and massifs) over East Asia (e.g.

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Section: Sampling Sitesmentioning

confidence: 99%

Section: Geology Of the Mineoka Ophiolite Mélange (Mom)mentioning

confidence: 99%

Section: Sampling Sitesmentioning

confidence: 99%

Section: Sampling Sites and Lithological Variationsmentioning

confidence: 99%

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Cretaceous to Miocene NW Pacific Plate Kinematic Constraints: Paleomagnetism and Ar–Ar Geochronology in the Mineoka Ophiolite Mélange (Japan)

et al. 2021

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“…These ages are generally supported by new whole-rock Ar-Ar dating by Hirano et al (2003), but some alkaline basalts were found to be younger, around 20 m.y. old (Hirano & Okuzawa 2002). Ophiolitic rocks in the Mineoka Belt are accompanied by a number of other lithologies.…”

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confidence: 99%

The nature of faulting and deformation in the Mineoka ophiolite, NW Pacific Rim

Takahashi

Ogawa

Ohta

et al. 2003

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A belt of disrupted ophiolitic rocks occurs on the Boso Peninsula (Japan), currently located north of the oblique subduction boundary between the Philippine Sea and North American Plates, under which the Pacific Plate has been subducting westwards. This ophiolitic belt (Mirleoka Belt) is composed of mafic-ultramafic rocks together with Tertiary chert and limestone and island-arc volcaniclastic rocks. Our detailed structural studies in and around the basaltic rock bodies within the ophiolite reveal three phases of deformation. The first phase is further divided into three stages, all related to oblique normal faulting associated with extensional tectonics at or near a spreading axis. Fluid pressures appear to have fluctuated in association with faulting and veining during this phase. The second phase of deformation is characterized by thrust-related shear zones with a significant strike-slip component and is probably related to the final emplacement of the ophiolite by oblique subduction-obduction processes. The third and final phase of deformation affected not only the ophiolite but also later terrigenous and island-arc pyroclastic rocks. This deformation involved large-scale transpressional dextral slip on forearc sliver faults, which are still active today.

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Seafloor spreading, obduction and triple junction tectonics of the Mineoka Ophiolite, Central Japan

Ogawa

Takahashi

2004

Tectonophysics

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Occurrence of the sandstone included in the alkali-basalt lava flow from the western Mineoka Belt, Boso Peninsula, Japan, and its tectonic significance.

Cited by 11 publications

References 0 publications

Cretaceous to Miocene NW Pacific Plate Kinematic Constraints: Paleomagnetism and Ar–Ar Geochronology in the Mineoka Ophiolite Mélange (Japan)

Cretaceous to Miocene NW Pacific Plate Kinematic Constraints: Paleomagnetism and Ar–Ar Geochronology in the Mineoka Ophiolite Mélange (Japan)

The nature of faulting and deformation in the Mineoka ophiolite, NW Pacific Rim

Seafloor spreading, obduction and triple junction tectonics of the Mineoka Ophiolite, Central Japan

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