日高変成帯主帯に分布する高変成度角閃岩類の原岩推定および北部日高帯緑色岩類との比較

Kawanami, Seishi; Nakano, Nobuhiko; Osanai, Yasuhito; Kagami, Hiroo; Owada, Masaaki

doi:10.5575/geosoc.112.639

Cited by 14 publications

(23 citation statements)

References 27 publications

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“…The lithology and chemical composition of the rocks as well as field evidence suggest that the upper sequence could be derived from the Nakanogawa Group (Osanai et al, ). On the other hand, Kawanami et al () suggested that the amphibolite in the lower sequence can correlate with the N‐MORB green rocks in the northern Hidaka Belt described by Miyashita et al (). They suggested that the green rocks, which include Eocene clastic sequences such as the Tomuraushi, Uenkotan, and Rurochi greenstones (Kiminami et al, ), are the protoliths of the lower sequence in the northern Hidaka Belt (Figure ).…”

Section: General Geology Of the Hidaka Mountainsmentioning

confidence: 93%

“…In contrast, the lower sequence (lower structural level) comprises granulite and amphibolite units (Osanai et al, ). The protoliths of the upper sequence are graywackes and pelites, with no basic rocks, whereas those of the lower sequence are composed dominantly of MORB‐type rocks with intercalated graywacke (Kawanami, Nakano, Osanai, Kagami, & Owada, ; Osanai et al, ). The lithology and chemical composition of the rocks as well as field evidence suggest that the upper sequence could be derived from the Nakanogawa Group (Osanai et al, ).…”

Section: General Geology Of the Hidaka Mountainsmentioning

confidence: 99%

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U–Pb zircon ages of the Nakanogawa Group in the Hidaka Belt, northern Japan: Implications for its provenance and the protolith of the Hidaka metamorphic rocks

et al. 2017

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Zircon U–Pb ages of two acidic tuff and two turbidite sandstone samples from the Nakanogawa Group, Hidaka Belt, were measured to estimate its depositional age and the development of the Hokkaido Central Belt, northeast Japan. In the northern unit, homogeneous zircons from pelagic acidic tuff from a basal horizon dated to 58–57 Ma, zircons from sandstone from the upper part of the unit dated to 56–54 Ma, and zircons from acidic tuff from the uppermost part dated to 60–56 Ma and 69–63 Ma. Both of the tuff U–Pb ages are significantly older than the youngest radiolarian fossil age (66–48 Ma). Therefore, the maximum depositional age of the turbidite facies in the northern unit is 58 Ma and the younger age limit, estimated from the fossil age, is 48 Ma. In the southern unit, homogeneous zircons from turbidite sandstone dated to 58–57 Ma. Thus the depositional age of this turbidite facies was interpreted to be 66–56 Ma from the fossil age, probably close to 57 Ma. Most of the zircon U–Pb ages from the Nakanogawa Group are younger than 80 Ma, with a major peak at 60 Ma. This result implies that around Hokkaido volcanic activity occurred mainly after 80 Ma. Older zircon ages (120–80 Ma, 180–140 Ma, 340–220 Ma, 1.9 Ga, 2.2 Ga, and 2.7 Ga) give information about the provenance of other rocks in the Hidaka Belt. It is inferred that the Nakanogawa Group comprises protoliths of the upper sequence of the Hidaka Metamorphic Zone, which therefore has the same depositional age as the Nakanogawa Group (66–48 Ma). The depositional ages of the lower sequence of the Hidaka Metamorphic Zone and the Nakanogawa Group are probably the same.

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Section: General Geology Of the Hidaka Mountainsmentioning

confidence: 93%

Section: General Geology Of the Hidaka Mountainsmentioning

confidence: 99%

U–Pb zircon ages of the Nakanogawa Group in the Hidaka Belt, northern Japan: Implications for its provenance and the protolith of the Hidaka metamorphic rocks

et al. 2017

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“…In the Hidaka Supergroup, existence of in-situ greenstone with N-MORB compositions that extruded upon or intruded into unconsolidated sediments have been reported Kiminami et al, 1999;Miyashita and Kiminami, 1999). These N-MORB effusive rocks in the Hidaka Supergroup are regarded as a protolith of the metabasites in the HMB (e.g., Komatsu, 1985;Osanai et al, 1989;Kawanami et al, 2006). Nanayama (1992a) noted that the rocks along the eastern margin of the Nakanogawa Group were highly deformed compared with other parts of the Nakanogawa Group.…”

Section: Geological Outline Of the Hidaka Belt And Description Of Sammentioning

confidence: 99%

“…This so-called 'in-situ greenstone' consists mainly of dolerite, massive lava, and pillow lava, and it is regarded as having the geochemical characteristics of the normal mid-ocean ridge basalts (N-MORBs) that formed at the subducting oceanic ridge near the Eurasian continent (Miyashita and Katsushima, 1986;Miyashita and Yoshida, 1994;Miyashita et al, 1997;Miyashita and Kiminami, 1999). Kawanami et al (2006) reported that metabasites in the HMB and greenstones in the northern Hidaka belt, including in-situ greenstone, exhibit N-MORB-like whole-rock geochemical composition and Sr isotopic signatures.…”

Section: Introductionmentioning

confidence: 99%

“…Fundamental problems latent in previous work are as follows: 1) Previous discussions were based mainly on mineral chemistry and whole-rock major and minor element compositions. Whereas the metabasites from the HMB show typical N-MORB-type rare-earth element (REE) patterns (Mikoshiba-Ujiie, 1999;Kawanami et al, 2006;, virtually no report describes the multi-trace elements, including REEs from the in-situ greenstone, in the northern Hidaka belt. This information is critically important for specifying the origin of metabasites in the HMB.…”

Section: Introductionmentioning

confidence: 99%

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Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Yamasaki

Nanayama

2020

Journal of Mineralogical and Petrological Sciences

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The Hidaka belt in Central Hokkaido, Japan, consists of an early Paleogene subduction complex, referred to as the Hidaka Supergroup, dominated by clastic rocks. The southern area of the Hidaka Supergroup is referred to as the Nakanogawa Group, which gradually leads to the high-temperature Hidaka metamorphic belt in the western part. We collected 17 samples of greenstone from the entire Hidaka belt and examined their wholerock major and trace element geochemistry. Including those described in previous reports, three distinct types of greenstone exist in the Hidaka belt. Type 1 greenstone is an ocean island basalt-type greenstone. The multielement and rare earth element (REE) patterns for this type of greenstone show a steep slope up to the left, with Ti/V > 62 and Zr/Nb < 15. Type 2 greenstone is a mid-ocean ridge basalt (MORB)-type greenstone that shows relatively flat chondrite-normalized REE patterns and a gentle slope up to the left on the normal-MORBnormalized multi-element patterns with Ti/V = 26-53 and Zr/Nb = 21-117. Type 3 greenstone shows multielement and REE patterns similar to those of Type 1, but with a clear relative depletion of Nb, Ta, and Ti. In addition, its Ti-V relations are similar to those of Type 2 greenstone. Type 1 and Type 3 greenstones occur only in the Nakanogawa Group. Type 2 greenstone is mostly distributed in the northern the Hidaka Supergroup. Type 1 and Type 3 greenstones were generated by igneous activity on the Izanagi Plate, which was being subducted during the formation of the subduction complex of the Hidaka belt. Type 2 greenstone is interpreted as a product of a spreading axis that was active during the formation of the same subduction complex. Whereas Type 2 greenstone has been regarded as having a typical MORB-like geochemical signature, our results show slightly different, Indian Ocean MORB-type trace element patterns. These geochemical signatures are different than those of the amphibolites in the Hidaka metamorphic belt. The protolith of the amphibolite is not equivalent to the Type 2 greenstones and is probably an accreted fragment of an older oceanic plate. Type 2 greenstone was presumably generated from upper mantle with an Indian mantle-like geochemical signature during the Izanagi-Pacific ridge subduction on the western margins of the Pacific Ocean around 48 Ma.

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Melting of crustal rocks as a possible origin for Middle Miocene to Quaternary rhyolites of northeast Hokkaido, Japan: Constraints from Sr and Nd isotopes and major- and trace-element chemistry

Takanashi

Kakihara

Ishimoto

et al. 2012

Journal of Volcanology and Geothermal Research

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日高変成帯主帯に分布する高変成度角閃岩類の原岩推定および北部日高帯緑色岩類との比較

Cited by 14 publications

References 27 publications

U–Pb zircon ages of the Nakanogawa Group in the Hidaka Belt, northern Japan: Implications for its provenance and the protolith of the Hidaka metamorphic rocks

U–Pb zircon ages of the Nakanogawa Group in the Hidaka Belt, northern Japan: Implications for its provenance and the protolith of the Hidaka metamorphic rocks

Three types of greenstone from the Hidaka belt, Hokkaido, Japan: Insights into geodynamic setting of northeastern margin of the Eurasian plate in the Paleogene

Melting of crustal rocks as a possible origin for Middle Miocene to Quaternary rhyolites of northeast Hokkaido, Japan: Constraints from Sr and Nd isotopes and major- and trace-element chemistry

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