Migmatite tectonics of the hidaka metamorphic belt, Hokkaido, Japan

Kizaki, Kôshirô; Hayashi, Daigoro

doi:10.1016/0040-1951(79)90083-0

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…The Hokkaido subduction zone ( Figure 1) is distinct in the northwest Pacific subduction system, because the Kuril arc is colliding with the Honshu arc in the southern-central part of Hokkaido island [e.g., Kizaki and Hayashi, 1979;Kimura, 1986Kimura, , 1996Arita et al, 1998;Iwasaki et al, 2004;Itoh et al, 2005], and the Pacific slab is obliquely subducting beneath the Okhotsk plate [e.g., Suzuki et al, 1983;Ozel and Moriya, 1999;Miller et al, 2006;Kita et al, 2010aKita et al, , 2010b. Many active arc volcanoes and large thrust faults exist in Hokkaido, causing intensive seismic and volcanic activities in the region [Geological Survey of Japan, 1992].…”

Section: Introductionmentioning

confidence: 99%

P wave azimuthal and radial anisotropy of the Hokkaido subduction zone

Niu

Zhao

et al. 2016

JGR Solid Earth

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We present the first three‐dimensional P wave radial anisotropy tomography of the Hokkaido subduction zone, as well as P wave azimuthal anisotropy and S wave tomography, which are determined by inverting 298,430 P wave and 233,934 S wave arrival times from 14,245 local earthquakes recorded by 344 seismic stations. Our results reveal significant velocity heterogeneity, seismic anisotropy, and upwelling flows beneath the study region. In the mantle wedge, prominent low‐velocity (low‐V) anomalies exhibit trench‐normal fast‐velocity directions (FVDs) and a negative radial anisotropy (i.e., vertical velocity > horizontal velocity), which may reflect upwelling mantle flows. Fan‐shaped FVDs are found at depths of 65–90 km, and a detailed 3‐D mantle flow pattern is revealed, which may be caused by a combination of oblique subduction of the Pacific plate and collision of the Kuril arc with the Honshu arc beneath southern Hokkaido. The radial anisotropy changes at ~100 km depth, which may reflect variations in temperature and fluid conditions there. The subducting Pacific slab exhibits a positive radial anisotropy (i.e., horizontal velocity > vertical velocity), which may reflect the original fossil anisotropy when the Pacific plate formed at the mid‐ocean ridge.

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Section: Introductionmentioning

confidence: 99%

P wave azimuthal and radial anisotropy of the Hokkaido subduction zone

Niu

Zhao

et al. 2016

JGR Solid Earth

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“…Thompson (1982) and England and Thompson (1984) suggest that melting conditions in andalusite-sillimanite terrains such as the QMB, are generally only attained during rapid uplift of tectonically thickened crust. In the central QMB, rapid uplift may result from the diapir-like rise of partially melted rocks in a manner similar to the migmatite tectonics described by Kizaki & Hayashi (1979).…”

Section: Discussionmentioning

confidence: 99%

Temporal and compositional differences between subsolidus and anatectic migmatite leucosomes from the Quetico metasedimentary belt, Canada

Sawyer

Barnes

1988

Journal Metamorphic Geology

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Abstract. Migmatites in the Quetico Metasedimentary Belt contain two types of leucosome:(1) Layer-parallel leucosomes that grew during deformation and prograde metamorphism. These are enriched in Si02, Sr, and Eu, but depleted in Ti02, Fe203, MgO, Cs, Rb, REE, Sc, Th. Zr, and Hf relative to the Quetico metasediments. (2) Discordant leucosomes that formed after the regional folding events when metamorphic temperatures were at their peak. These are enriched in Rb, Ba, Sr and Eu, but display a wide range of LREE, Th. Zr, and Hf contents relative to the Quetico metasediments.Layer-parallel leucosomes formed by a subsolidus process termed tectonic segregation. This stress-induced mass transfer pFocess began when the Quetico sediments were deformed during burial, and continued whilst the rocks were both stressed and heterogeneous. Subsolidus leucosome compositions are consistent with the mobilization of quartz and feldspar from the host rocks by pressure solution. The discordant leucosomes formed by partial melting of the Quetico metasediments, possibly during uplift of the belt. The range of composition displayed by the anatectic leucosomes arises from crystal fractionation during leucosome emplacement. Some anatectic leucosomes preserve primary melt compositions and have smooth REE patterns, but those with negative Eu anomalies represent fractionated melts, and others with positive Eu anomalies represent accumulations of feldspar plus trapped melt.

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“…Miyashiro (1961) suggested that this belt of low-pressure type on the east and the Kamuikotan metamorphic belt of high-pressure type on the west are the paired metamorphic belts which were formed along the ancient Sakhline Arc with its associated trench on the west side. Petrofabrics and tectonics of migmatite plutons of the belt were studied by Kizaki & Hayashi (1979) and Kasugai (1957). Recently, Komatsu, Miyashita, Maeda.…”

Section: Introductionmentioning

confidence: 99%

Metamorphic evolution of the southern part of the Hidaka belt, Hokkaido, Japan

Shiba

1988

Journal Metamorphic Geology

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The Hidaka metamorphic terrane in the Meguro-Shoya area, Hokkaido, Japan is divided into four progressive metamorphic zones: A-biotite zone; B-cordierite zone; C-cordierite-K-feldspar zone; and, D-sillimanite-K-feldspar zone of the andalusite-sillimanite facies series type of metamorphism. The metamorphic grade ranges from the higher temperature part of the greenschist facies (zone A) through the amphibolite facies (zones B and C) to the lower temperature part of the granulite facies (zone D). The zone boundaries intersect the bedding planes at high angles. P-T conditions estimated are 450-550°C and 2 kbar for zone A, 550400°C and 2-2.5 kbar for zone B, 600450°C and 2.5-3 kbar for zone C and 650-750°C and 3-4 kbar for zone D. The metapelites of zone D were partially melted.At the later stage of the regional metamorphism which is early Oligocene to early Miocene in age, cordierite tonalite and biotite tonalite intrusives associated with segments of the highest grade rocks (zone D) were emplaced into the lower temperature part of the regional metamorphic rocks, giving rise to a contact metamorphic aureole. The thermally metamorphosed terrain (zone C') belongs to the arnphibolite facies and its P-T conditions are estimated to have been 550-700°C and 2 kbar.The P-T-t paths of the Hidaka metamorphism show a thickening-heating-uplifting process. The metamorphism is inferred to have taken place beneath an active island arc accompanied by partial melting of the crust. This paper first discusses the metamorphic facies and the P-T conditions of the Hidaka Key-words: andalusite-sillimanite type meta-west. morphism; Hidaka metamorphic belt; P-T-l path; orogenic belt

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Migmatite tectonics of the hidaka metamorphic belt, Hokkaido, Japan

Cited by 6 publications

References 12 publications

P wave azimuthal and radial anisotropy of the Hokkaido subduction zone

P wave azimuthal and radial anisotropy of the Hokkaido subduction zone

Temporal and compositional differences between subsolidus and anatectic migmatite leucosomes from the Quetico metasedimentary belt, Canada

Metamorphic evolution of the southern part of the Hidaka belt, Hokkaido, Japan

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