Origin of layering observed in the Horoman peridotite complex, Japan

Niida, Kiyoaki; Takasawa, Eiichi

doi:10.5575/geosoc.113.s167

Cited by 5 publications

(4 citation statements)

References 34 publications

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Section: Geological Settingmentioning

confidence: 99%

“…Several separate bodies of ultramafic rocks are distributed in the northern and southern areas of the Hidaka metamorphic belt (Komatsu & Nochi 1966; Niida & Katoh 1978; Niida & Takazawa 2007). In the northern part of the Hidaka metamorphic belt, five peridotite complexes (Uenzaru, Pankenuushi, Tottabetsu, Oku‐Niikappu, Koibokushushibichari) are aligned from north to south along the Hidaka Main Thrust (Niida & Takazawa 2007). In the southern part of the Hidaka metamorphic belt, meanwhile, the Menashunbetsu and Horoman peridotite complexes are situated in the western margin of the metamorphic belt and three small peridotite bodies (Pon‐Nikanbetsu, Nikanbetsu, Abeyaki) are aligned from the eastern side of the Horoman peridotite complex to the southeast within the Hidaka metamorphic belt (Niida & Takazawa 2007).…”

Section: Geological Settingmentioning

confidence: 99%

“…In the northern part of the Hidaka metamorphic belt, five peridotite complexes (Uenzaru, Pankenuushi, Tottabetsu, Oku‐Niikappu, Koibokushushibichari) are aligned from north to south along the Hidaka Main Thrust (Niida & Takazawa 2007). In the southern part of the Hidaka metamorphic belt, meanwhile, the Menashunbetsu and Horoman peridotite complexes are situated in the western margin of the metamorphic belt and three small peridotite bodies (Pon‐Nikanbetsu, Nikanbetsu, Abeyaki) are aligned from the eastern side of the Horoman peridotite complex to the southeast within the Hidaka metamorphic belt (Niida & Takazawa 2007). The Horoman peridotite complex is incomparably larger than the other ultramafic bodies in the Hidaka metamorphic belt.…”

Section: Geological Settingmentioning

confidence: 99%

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Subhorizontal tectonic framework of the Horoman peridotite complex and enveloping crustal rocks, south‐central Hokkaido, Japan

et al. 2010

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Geological observations in the Horoman area, south-central Hokkaido, show that the Horoman peridotite complex of the Hidaka metamorphic belt is a tectonic slice about 1200 m thick. The peridotite slab is intercalated into a gently east-dipping structure. The underlying unit is a Cretaceous-Paleogene accretionary complex. Riedel shear planes in the sedimentary layers of the accretionary complex near the structural bottom of the peridotite slab indicate top-to-the-west (thrust) displacement. The overlying unit is composed of felsic-pelitic gneisses and mafic-felsic intrusive rocks (the Hidaka metamorphic rocks). The boundary surface between the peridotite complex and metamorphic rocks forms a domal structure. Microstructures of sheared metamorphic rocks near the structural top of the peridotite slab indicate top-to-the-east (normal) displacement. The results combined with previous studies suggest that the Horoman peridotite complex was emplaced onto the Asian margin (Northeast Japan) during the collision between the Asian margin and the Hidaka crustal block.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Subhorizontal tectonic framework of the Horoman peridotite complex and enveloping crustal rocks, south‐central Hokkaido, Japan

et al. 2010

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“…To test that hypothesis, an analysis of grain-size would be effective because stress influences the size of mantle minerals such as olivine (e.g., Chu and Korenaga, 2012;Karato et al, 1980;Van der Wal et al, 1993;Yamamoto et al, 2008). It has been reported that the Horoman peridotite complex may contain megacrystic olivines, which seem to stretch to several tens of centimeters long (Niida and Takazawa, 2007;Niida et al, 2002;Yoshikawa et al, 2019). Because there are no other occurrences of such a huge single olivine grain, the identification of continuity of the olivine would establish a foothold for exploring an uncharted crystallogenetic condition of channels in mantle.…”

Section: Introduction and Research Aimmentioning

confidence: 99%

Raman spectroscopic identification of continuity of a channel olivine in a peridotite specimen

et al. 2022

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In the Horoman peridotite complex, the peridotite containing olivine-filled channels is known to exist. To examine the distribution pattern of the channel olivine, we performed non-destructive microanalyses of Raman spectra at 51 points of the olivine with 5 mm intervals along the channel. Compared with the Raman spectra of a reference euhedral olivine, for which the crystallographic orientation is known, there is no abrupt change in the crystallographic orientation in the 250 mm line analysis region of the channel. Moreover, Mg/Fe ratios of the channel olivine show gradual change over the entire measured area. If the channel olivine is an aggregate of olivine grains crystallized from magma infiltrating into the channel, then there should be olivine grains with both uneven crystallographic orientation and a homogeneous Mg/Fe ratio. Therefore, the olivine in the channel is regarded as a single crystal with slight growth zoning. The peridotite with the channel had been a part of mantle that was uplifted by the collision of plates. Therefore, the channel is a trace of magma migrating in the mantle. Magma migration in mantle drives the material-thermal circulation system connecting the Earth's interior and surface. Furthermore, the size of the mineral in mantle reflects its stress field. Therefore, the magma channel involving such a large olivine is a unique specimen that reveals the particular characteristics of magmatism occurring in the Earth's interior.

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Variation in olivine crystal-fabrics and their seismic anisotropies in the Horoman peridotite complex, Hokkaido, Japan

Matsuyama,

Michibayashi

2023

Journal of Geodynamics

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Origin of layering observed in the Horoman peridotite complex, Japan

Cited by 5 publications

References 34 publications

Subhorizontal tectonic framework of the Horoman peridotite complex and enveloping crustal rocks, south‐central Hokkaido, Japan

Subhorizontal tectonic framework of the Horoman peridotite complex and enveloping crustal rocks, south‐central Hokkaido, Japan

Raman spectroscopic identification of continuity of a channel olivine in a peridotite specimen

Variation in olivine crystal-fabrics and their seismic anisotropies in the Horoman peridotite complex, Hokkaido, Japan

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