Geological study of the Hidaka Supergroup distributed on the east of the Hidaka metamorphic belt:(Part 2)Petrographical study of the sandstones in the Nakanogawa Group

Kontani, Yoshihiro

doi:10.5575/geosoc.86.1

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“…The modal compositional ranges (as ratios) of sandstones in zone Y are Q/F = 0.01-0.77, Q/R = 0.04-0.38, and R/F = 1.48-13.60; those in zone U are Q/F = 0.01-0.56, Q/R = 0.10-0.31, and R/F = 1.64-5.43; those in zone R are Q/F = 0.33-1.77, Q/R = 0.09-0.54, and R/F = 0.89-4.78; and those in zone S are Q/F = 0.47-1.77, Q/R = 0.60-1.05, and R/F = 0.96-2.28. The modal compositional range of the Nakanogawa Group in the SHB (dashed blue line, Figure 11a; Kontani, 1980) Group (zone Y) had already started at 73-71 Ma. The accretionary complex was formed near the paleo-Kuril arc at the same time as the Horobetsugawa Complex in the Idonnappu zone, and grew continuously until 48 Ma.…”

Section: Sandstone Compositionsmentioning

confidence: 99%

“…Data for the Yubetsu Group are modified from Kontani and Kiminami (1980). The blue dashed line indicates the compositional range of the Nakanogawa Group in the southern Hidaka belt (Kontani, 1980) deposits cover the Shimokawa ophiolite and are observed in the Okushibetsu Complex in zone S, the Kamiokoppe Formation in zone U, and the Kamimaru Formation in the eastern side of zone R. Miyashita and Yoshida (1994) reported that these deposits resulted from the collapse of the inner trench slope, which consisted of accretionary complexes of the Idonnappu zone (Figure 14). Ridge subduction is known to cause uplift in the forearc region (Cande et al, 1987;Cande & Leslie, 1986;Nelson & Forsythe, 1989;B.…”

Section: New Ipr Subduction Model For the Formation Of In Situ Greenstonesmentioning

confidence: 99%

“…Again, the modal compositional range of rock fragments in the Nakanogawa Group in the SHB (blue dashed line, Figure11b;Kontani, 1980) overlaps the four NHB zones. 8 | DISCUSSION 8.1 | Tectonic setting of zone Y Our new zircon U-Pb age of 48.2 ± 0.6 Ma (KY-ss-03) for the Kanayama Formation along the western boundary of zone Y is stratigraphically consistent with the early Eocene (54-49 Ma) age of dinoflagellate fossils in the Mukaiengaru Formation(Kurita & Tajika, 1998).…”

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The emplacement ofin situgreenstones in the northern Hidaka belt: The tectonic relationship between subduction of the Izanagi–Pacific ridge and Hidaka magmatic activity

Nanayama

Tajika²,

Yamasaki

et al. 2021

Island Arc

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Greenstone bodies emplaced upon or into clastic sediments crop out ubiquitously in the Hidaka belt (early Paleogene accretionary and collisional complexes exposed in the central part of northern Hokkaido, NE Japan), but the timing and setting of their emplacement has remained poorly constrained. Here, we report new zircon U-Pb ages for the sedimentary complexes surrounding these greenstones. The Hidaka Supergroup in the northern Hidaka belt is divided into four zones from west to east: zones S, U, and R, which contain in situ greenstones; and zone Y, which does not. Detrital zircons in zones S, U, and R have early Eocene U-Pb ages (55-47 Ma) and these strata are intruded by early Eocene granites (46-45 Ma), indicating that they were deposited between 55 and 46 Ma. Therefore, in situ greenstones in the northern Hidaka belt can only be explained by the subduction of the Izanagi-Pacific Ridge during 55-47 Ma. In contrast, the deposition of zone Y (the Yubetsu Group, younging to the west) began by 73-71 Ma, indicating that the accretionary prism in front of the paleo-Kuril arc formed at the same time as that in the Idonnappu zone and grew continuously until 48 Ma. The plutonic rocks that intruded the Hidaka belt are roughly divided into three stages: (1) early Eocene granites intruded the northern Hidaka belt at 46-45 Ma, during subduction of the Izanagi-Pacific Ridge; (2) the upper sequence of the Hidaka metamorphic zone was metamorphosed by magmatism at 40-37 Ma associated with the collision of the paleo-Kuril arc and NE Asia; and (3) younger granites intruded the entire Hidaka belt at 20-17 Ma in association with asthenospheric upwelling caused by back-arc expansion.

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Section: Sandstone Compositionsmentioning

confidence: 99%

Section: New Ipr Subduction Model For the Formation Of In Situ Greenstonesmentioning

confidence: 99%

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The emplacement ofin situgreenstones in the northern Hidaka belt: The tectonic relationship between subduction of the Izanagi–Pacific ridge and Hidaka magmatic activity

Nanayama

Tajika²,

Yamasaki

et al. 2021

Island Arc

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The latest Cretaceous‐Early Paleogene rapid growth of accretionary complex and exhumation of high pressure series metamorphic rocks in northwestern Pacific margin

Kimura¹

1994

J. Geophys. Res.

136

157

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Episodic growth of accretionary complexes along the northwestern Pacific margin is well documented from detailed biostratigraphy and radiometric dating of metamorphic rocks. The latest Cretaceous to early Paleogene rapid growth of the accretionary complexes observed in Hokkaido and Sakhalin Islands was caused by the supply of a large amount of terrigenous sediments from an intracontinent collision zone: the Mongolia‐Okhotsk zone in the northern Asian continent. Rapid growth of the accretionary prism resulted in episodic tectonic events in the forearc and magmatic arc. Rapid underplating caused uplift and exhumation of previously accreted complexes along with high pressure series metamorphic rocks, now exposed as the Kamuikotan complex in Hokkaido and the Susunai complex in Sakhalin. The forearc basin shallowed as a result of the uplift. The uplift collapsed the old accretionary complex and supplied olistoliths onto the forearc region. Magmatic activity along the continental margin was also active at the same time. Subduction of a large amount of terrigenous sediments into the mantle may have contributed to active magmatism at that time. A large supply of water trapped in the subducted sediments entered the mantle and increased partial melting of the mantle wedge.

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Cretaceous episodic growth of the Japanese Islands

Kimura

1997

Island Arc

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The Japanese Islands formed rapidly in situ along the eastern Asian continental margin in the Cretaceous due to both tectonic and magmatic processes. In the Early Cretaceous, huge oceanic plateaus created by the mid-Panthalassa super plume accreted with the continental margin. This tectonic interaction of oceanic plateau with continental crust is one of the significant tectonic processes responsible for continental growth in subduction zones. In the Japanese Islands, Late Cretaceous-Early Paleogene continental growth is much more episodic aAd drastic. At this time the continental margin uplifted regionally, and intra-continent collision tectonics took place in the northern part of the Asian continent. The uplifting event appears to have been caused by the subduction of very young oceanic crust (i.e. the Izanagi-Kula Plate) along the continental margin. Magmatism was also very active, and melting of the young oceanic slab appears to have resulted in ubiquitous plutons in the continental margin. Regional uplift of the continental margin and intra-continent collision tectonics promoted erosion of the uplifted area, and a large amount of terrigenous sediment was abruptly supplied to the trench. As a result of the rapid supply of terrigenous detritus, the accretionary complexes (the Hidaka Belt in Hokkaido and the Shimanto Belt in Southwest Japan) grew rapidly in the subduction zone. The rapid growth of the accretionary complexes and the subduction of very young, buoyant oceanic crust caused the extrusion of a high-P/T metamorphic wedge from the deep levels of the subduction zone. Episodic growth of the Late Cretaceous Japanese Islands suggests that subduction of very young oceanic crust and/or ridge subduction are very significant for the formation of new continental crust in subduction zones.

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Geological study of the Hidaka Supergroup distributed on the east of the Hidaka metamorphic belt:(Part 2)Petrographical study of the sandstones in the Nakanogawa Group

Cited by 3 publications

References 0 publications

The emplacement ofin situgreenstones in the northern Hidaka belt: The tectonic relationship between subduction of the Izanagi–Pacific ridge and Hidaka magmatic activity

The emplacement ofin situgreenstones in the northern Hidaka belt: The tectonic relationship between subduction of the Izanagi–Pacific ridge and Hidaka magmatic activity

The latest Cretaceous‐Early Paleogene rapid growth of accretionary complex and exhumation of high pressure series metamorphic rocks in northwestern Pacific margin

Cretaceous episodic growth of the Japanese Islands

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