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

Ogawa, Yujiro; Takahashi, Akiko

doi:10.1016/j.tecto.2004.08.007

Cited by 14 publications

(19 citation statements)

References 21 publications

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“…The IzuBonin-Mariana arc indented the pre-existing active margin of the Eurasian plate, which would be expect to result in right-lateral (tectonic escape) structures along the northwest margin of the indentor (Koyama and Kitazato 1988;Figure 19(c)). Field evidence indicates that right-lateral strike-slip/transpression, exemplified by Riedel shear fabrics, did indeed dominate the Miocene-recent structural development of preexisting accretionary melange (Mineoka melange) (Ogawa and Takahashi 2004;Mori and Ogawa 2005;Mori et al 2011).…”

Section: Constraints From the Geology Of Honshumentioning

confidence: 99%

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Robertson

Kutterolf

Avery

et al. 2017

International Geology Review

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New biostratigraphical, geochemical, and magnetic evidence is synthesized with IODP Expedition 352 shipboard results to understand the sedimentary and tectono-magmatic development of the Izu-Bonin outer forearc region. The oceanic basement of the Izu-Bonin forearc was created by supra-subduction zone seafloor spreading during early Eocene (c. 50-51 Ma). Seafloor spreading created an irregular seafloor topography on which talus locally accumulated. Oxide-rich sediments accumulated above the igneous basement by mixing of hydrothermal and pelagic sediment. Basaltic volcanism was followed by a hiatus of up to 15 million years as a result of topographic isolation or sediment bypassing. Variably tuffaceous deep-sea sediments were deposited during Oligocene to early Miocene and from mid-Miocene to Pleistocene. The sediments ponded into extensional fault-controlled basins, whereas condensed sediments accumulated on a local basement high. Oligocene nannofossil ooze accumulated together with felsic tuff that was mainly derived from the nearby Izu-Bonin arc. Accumulation of radiolarian-bearing mud, silty clay, and hydrogenous metal oxides beneath the carbonate compensation depth (CCD) characterized the early Miocene, followed by middle Miocene-Pleistocene increased carbonate preservation, deepened CCD and tephra input from both the oceanic Izu-Bonin arc and the continental margin Honshu arc. The Izu-Bonin forearc basement formed in a near-equatorial setting, with late Mesozoic arc remnants to the west. Subduction-initiation magmatism is likely to have taken place near a pre-existing continent-oceanic crust boundary. The Izu-Bonin arc migrated northward and clockwise to collide with Honshu by early Miocene, strongly influencing regional sedimentation. ARTICLE HISTORY

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Section: Constraints From the Geology Of Honshumentioning

confidence: 99%

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Robertson

Kutterolf

Avery

et al. 2017

International Geology Review

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“…2001a; Dimalanta et al . 2002; Ogawa & Takahashi 2004). Recognition of how ophiolites formed in either fast or slow spreading centers, within open sea or restrictive basin environment, had elucidated our understanding of the paleogeographic setting of a particular area (e.g.…”

Section: Introductionmentioning

confidence: 99%

Westward younging disposition of Philippine ophiolites and its implication for arc evolution

Yumul

2007

Island Arc

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The different ophiolite complexes in the Philippine island arc system define a progressive younging direction westward. This resulted from the clockwise rotation of the Philippine island arc system during its north-westward translation in the Eocene resulting in its western boundary colliding with the Sundaland-Eurasian margin. As a consequence of this interaction, ophiolite complexes and mélanges accreted into the Philippine island arc system along its western side. A new ophiolite zonation with four belts is proposed that takes into consideration the observed spatial and temporal relationships of the exposed oceanic lithosphere slices. With progressive younging from east to west, Belt 1 corresponds to Late Cretaceous complete ophiolite complexes with associated metamorphic soles along the eastern Philippines, whereas Belt 2 includes Early to Late Cretaceous dismembered ultramafic-mafic complexes with mélanges exposed mainly west of eastern Philippines. Belt 3 is defined by Cretaceous through Eocene to Oligocene ophiolite complexes emplaced along the collision zone between the Philippine Mobile Belt and the Sundaland-Eurasian margin. Belt 4 corresponds to the ophiolite complexes emplaced along continental margins as exposed in the Palawan and Zamboanga-Sulu areas. This proposed zonation hints that the whole Philippine Mobile Belt, except for the strike-slip fault bounded Eocene Zambales ophiolite complex in Luzon, is underlain by Cretaceous proto-Philippine Sea Plate fragments. This is contrary to the previous models that consider only the eastern margin of the Philippines to contain proto-Philippine Sea Plate materials.

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“…In convergent margins, there are in places ophiolitic mélanges forming fault belts in which metamorphic and plutonic rock blocks are incorporated (Ogawa & Taniguchi 1987; Ogawa & Takahashi 2004). Such fault belts are recognized in association with ancient accretionary complexes, as well as discrete bodies of forearc ophiolite belts around the western Pacific margins (Ueda et al .…”

Section: Introductionmentioning

confidence: 99%

“…1996) might be applicable. However, only a few studies have been undertaken on forearc ophiolites in relation to accretionary prism development (Ogawa & Takahashi 2004). Composition and deformation structure within a forearc ophiolite and associated metamorphic and plutonic blocks provide a key to understanding the complicated tectonism for the incorporation of deeper rocks into ophiolitic mélanges.…”

Section: Introductionmentioning

confidence: 99%

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Transpressional tectonics of the Mineoka Ophiolite Belt in a trench–trench–trench‐type triple junction, Boso Peninsula, Japan

Mori

Ogawa

2005

Island Arc

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Structures developed in metamorphic and plutonic blocks that occur as knockers in the Mineoka Ophiolite Belt in the Boso Peninsula, central Japan, were analyzed. The aim was to understand the incorporation processes of blocks of metamorphic and plutonic rocks with an arc signature into the serpentinite mélange of the Mineoka Ophiolite Belt in relation to changes in metamorphic conditions during emplacement. Several stages of deformation during retrogressive metamorphism were identified: the first faulting stage had two substage shearing events (mylonitization) under ductile conditions inside the crystalline blocks in relatively deeper levels; and the second stage had brittle faulting and brecciation along the boundaries between the host serpentinite bodies in relatively shallower levels (zeolite facies). The first deformation occurred during uplift before emplacement. The blocks were intensively sheared by the first deformation event, and developed numerous shear planes with spacing of a few centimeters. The displacement and width of each shear plane were a few centimeters and a few millimeters, respectively, at most. In contrast, the fault zone of the second shearing stage reached a few meters in width and developed during emplacement of the Mineoka Ophiolite. Both stages occurred under a right-lateral transpressional regime, in which thrust-faulting was associated with strikeslip faulting. Such displacement on an outcrop scale is consistent with the present tectonics of the Mineoka Belt. This implies that the same tectonic stress has been operating in the Boso trench-trench-trench-type triple junction area in the northwest corner of the Pacific since the emplacement of the Mineoka Ophiolite. The Mineoka Ophiolite Belt must have worked as a forearc sliver fault during the formation of a Neogene accretionary prism further south.

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

Cited by 14 publications

References 21 publications

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Depositional setting, provenance, and tectonic-volcanic setting of Eocene–Recent deep-sea sediments of the oceanic Izu–Bonin forearc, northwest Pacific (IODP Expedition 352)

Westward younging disposition of Philippine ophiolites and its implication for arc evolution

Transpressional tectonics of the Mineoka Ophiolite Belt in a trench–trench–trench‐type triple junction, Boso Peninsula, Japan

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