A latest Early Miocene diatom age of the Kamikineusu Formation, southern centrla Hokkaido, Japan, and its implications for geological history.

正和, 芳賀; 智子, 黒田; 裕史, 浅野; 久一, 金川; 谷生, 伊藤

doi:10.5575/geosoc.105.589

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…The time of upthrust of the Hidaka metamorphic sequence has been confirmed by evidence that metamorphic and plutonic rocks are present within late Miocene conglomerates that occur on the eastern and western flanks of the Hidaka mountains ( Miyasaka & Kikuchi 1978). Recent diatom studies in this area ( Haga et al 1999 ) suggest that the timing of the upthrust of the Hidaka metamorphic sequence may go back to the latest early Miocene. As a consequence, the formation of echelon folds along the southwestern Kurile arc may have begun to delay these two events.…”

Section: Discussionmentioning

confidence: 99%

K–Ar ages of the Akan‐Shiretoko volcanic chain lying oblique to the Kurile trench: Implications for tectonic control of volcanism

Goto

Funayama²,

Gouchi

et al. 2000

Island Arc

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The Akan‐Shiretoko volcanic chain, situated in the Southwestern Kurile arc, consists mainly of nine subaerial andesitic stratovolcanoes and three calderas. The chain extends in a SW–NE direction for 200 km, situated oblique to the Kurile trench at an angle of 25 degrees. Thirty‐seven new K–Ar ages, plus previous data, suggest that volcanic activity along the Akan‐Shiretoko volcanic chain began at ca 4 Ma at Akan, at the southwestern end of the chain, and systematically progressed northeastward, resulting in the southwest‐northeast‐trending volcanic chain. This spatial and temporal distribution of volcanoes can be explained by anticline development advancing northeastward from the Akan area, accompanied by magma rising through northeast‐trending fractures that developed along the anticlinal axis. The northeastward development of the anticline caused uplifting of the Akan‐Shiretoko area and changed the area from submarine to subaerial conditions. Anticline formation was likely due to deformation of the southwestern Kurile arc, with southwestward migration of the Kurile forearc sliver caused by oblique subduction of the Pacific plate. The echelon topographic arrangement of the Shiretoko, Kunashiri, Etorofu and Urup was formed at ca 1 Ma.

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Section: Discussionmentioning

confidence: 99%

K–Ar ages of the Akan‐Shiretoko volcanic chain lying oblique to the Kurile trench: Implications for tectonic control of volcanism

Goto

Funayama²,

Gouchi

et al. 2000

Island Arc

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“…Before the onset of coarse‐grained turbidite sedimentation, fluvial to shallow marine sediments were deposited over a wide area of central Hokkaido during late Early to early Middle Miocene times. In these successions, basal conglomerate beds several tens of meters in thickness unconformably overlay various formations ranging from Cretaceous to Oligocene in age (Editorial Committee of Hokkaido 1990; Suzuki & Kurita 1998; Haga et al . 1999).…”

Section: Geological and Sedimentological Settingmentioning

confidence: 99%

Early exhumation of the collisional orogen and concurrent infill of foredeep basins in the Miocene Eurasian–Okhotsk Plate boundary, central Hokkaido, Japan: Inferences from K–Ar dating of granitoid clasts

et al. 2004

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Thick Middle (-Upper) Miocene turbiditic deposits filled very deep and narrow foredeep basins formed in the western margin of the Hidaka collision zone in central Hokkaido. Cobble-to boulder-sized clasts of eight monzogranites and a single granodiorite in the Kawabata Formation in the Yubari Mountains area yielded biotite K-Ar ages of 44.4 ± 1.0 to 45.4 ± 1.0 Ma and 42.8 ± 1.1 Ma, respectively. Major elemental compositions of the clasts all fall in the field of S-type granite on an NK/A (Na 2 O + K 2 O/Al 2 O 3 in molecule) versus A/CNK (Al 2 O 3 /CaO + Na 2 O + K 2 O in molecule) diagram, verifying their peraluminous granite character (aluminium saturation index (ASI): 1.12-1.19). These geochronological and petrographical features indicate that the granitoid clasts in the Kawabata Formation correlate with Eocene granitic plutons in the northeastern Hidaka Belt, specifically the Uttsudake (43 Ma) and Monbetsu (42 Ma) plutons. Foredeep basins are flexural depressions developed at the frontal side of thickened thrust wedges. The results presented here suggest that deposition of the Middle Miocene turbidites was coeval with rapid westward up-thrusting and exhumation of the Hidaka Belt. This early mountain building may have occurred in response to thrusting in the Tertiary fold-and-thrust system of central Hokkaido.

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Molluscan fossils from the middle Miocene in Kenbuchi-cho, northern Hokkaido, and their significance

Suzuki¹,

Okamoto²,

Sagayama³

et al. 2004

Jour. Geol. Soc. Japan

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Twelve molluscan species were identified from the middle Miocene in Kenbuchi-cho, northern Hokkaido, which is assigned to the Denticulopsis lauta Zone NPD A, . -. Ma . The molluscan assemblage includes some warm-water taxa such as Glycymeris cisshuensis and Liracassis japonica. The occurrence of the warm-water taxa indicates that warm water mass prevailed in northern Hokkaido. According to the molluscan evidence, northern Hokkaido was in a temperate marine zone during the early middle Miocene.

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A latest Early Miocene diatom age of the Kamikineusu Formation, southern centrla Hokkaido, Japan, and its implications for geological history.

Cited by 6 publications

References 7 publications

K–Ar ages of the Akan‐Shiretoko volcanic chain lying oblique to the Kurile trench: Implications for tectonic control of volcanism

K–Ar ages of the Akan‐Shiretoko volcanic chain lying oblique to the Kurile trench: Implications for tectonic control of volcanism

Early exhumation of the collisional orogen and concurrent infill of foredeep basins in the Miocene Eurasian–Okhotsk Plate boundary, central Hokkaido, Japan: Inferences from K–Ar dating of granitoid clasts

Molluscan fossils from the middle Miocene in Kenbuchi-cho, northern Hokkaido, and their significance

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