Hidaka Metamorphic Gr
Period:
Paleogene
Age Interval:
Province:
Hokkaido
Type Locality and Naming
Hidaka meta. Belt
Synonym:
Lithology and Thickness
The HIMB consists of high-temperature and low-pressure (HT-LP) metamorphic rocks up to granulite facies associated with abundant mafic to felsic plutonic rocks.
Metamorphic grade increases westwards and is cat by the east-dipping HIMT along the western (basal) margin, whereas the eastern low-grade parts of the complex grade into non-metamorphic accretionary sediments of the Nakanogawa Group lying to the east.
Metamorphic grade increases westwards and is cat by the east-dipping HIMT along the western (basal) margin, whereas the eastern low-grade parts of the complex grade into non-metamorphic accretionary sediments of the Nakanogawa Group lying to the east.
The HMB is divided into four metamorphic zones (Osanai et al. 1986, 1991, 1992; Komatsu et al. 1989, 1992, 1994): Zone I is character. ized by Ms + Chl (areenschist facies); Zone II comprises Bt + Ms; Zone IIT consists of Grt + Sill + Kf (both amphibolite facies); and Zone IV is characterized by Gat + Crd + Kf + Opx (granulite facies) with anatectites.
Lithology Pattern:
Metavolcanics
Relationships and Distribution
Lower contact
No data.
Upper contact
Hidaka Plutonics Fm (unconformable)
Regional extent
Hidaka Metamorphic Belt. The belt defines an NNW-trending arc c. 120 km long and 10-20 km wide, with foliations generally steeply dipping towards the east except in southernmost areas with flat-Lying structures.
GeoJSON
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Fossils
No data.
Age
Age Span:
Beginning stage:
Danian
Fraction up in beginning stage:
0
Beginning date (Ma):
66.04
Ending stage:
Bartonian
Fraction up in the ending stage:
0
Ending date (Ma):
41.03
Depositional setting
The whole metamorphic sequence, together with the non-metamorphic sediments, is regarded as an arc crustal section down to 22-23 km (Komatsu et al. 1989, 1994).
Depositional pattern:
Additional Information
Compiler:
Hayato Ueda. 2g Hokkaido. in Moreno, T., WALLIS, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 201-220.