Polymetamorphism in the Hida metamorphic rocks of upper Katakai river area, Toyama Prefecture, central Japan, with special reference to the effect of intrusion of the Funatsu granitic rocks.

Okui, Akihiko

doi:10.2465/ganko1941.80.382

Cited by 3 publications

(2 citation statements)

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“…Otherwise the large isotopic trough in UTS-4 may be resulted from the preferentially macro scale infiltration of metamorphic fluid near the grain boundary observed at present. Inazuki (1982) and Okui (1985) reported polymetamorphism in the Hida metamorphic rocks with special reference to the Funatsu granitic rocks. They revealed that water-rich metamorphic fluids regionally infiltrated into the metamorphic rocks coeval to the Funatsu granitic intrusion at about 180 Ma.…”

Section: Isotopic Zonationmentioning

confidence: 99%

“…1) provide an ex cellent opportunity for microscale investigations of carbon and oxygen isotopes in calcite and graphite during regional granulite-facies metamorphism and subsequent contact metamor phism related to granitic intrusion. The Hida metamorphic rocks were partially transformed from regionally metamorphosed mineral assemblages to contact mineral assemblages by the granitic intrusion (Inazuki, 1982;Okui, 1985). Coarse-grained calcite and graphite crystals, formed during the granulite facies metamorphism, were micro-sampled by the technique developed by Wada (1988).…”

Section: Introductionmentioning

confidence: 99%

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Stable isotopic evidence for migration of metamorphic fluids along grain boundaries of marbles.

Arita

Wada

1990

Geochem. J.

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In order to elucidate carbon and oxygen isotopic systematic in metamorphosed limestone and isotopic behavior during metamorphism, microscale. carbon and oxygen isotopic compositions of graphite and calcite in crystalline limestone were determined for the contact metamorphic aureole of the polymetamorphosed Hida metamorphic belt, central Japan. In this area granulite facies metamorphic rocks were overprinted by contact metamorphism related to a granitic intrusion. Carbon isotopic fractionation between individual crystalline graphites and the cores of coexisting calcite grains gives a constant value independent of the sampling localities. Graphites armored by silicates have the same 813C as other graphites in calcite. These indicate that carbon isotopic equilibrium between graphite and calcite was completely attained during granulite facies metamorphism.Values of 8180 in the cores of individual calcite grains vary over about 2%o near the granite contact, and the range of variation tends to become smaller with increasing distances from the contact. In calcite grains near the granite contact, 8180 values sharply decrease by up to 7%o within 200 -300 .Um wide zones toward grain boundaries, whereas 613C remain almost constant. This 8180 trough at the grain boundaries is less pronounced with increasing distance from the granite contact and is almost no longer seen at distance about 1.3 km.Oxygen isotopic zonation of calcite at grain boundaries strongly suggests partial isotopic exchange with water-rich metamorphic fluids that migrated along grain boundaries. This fluid-rock interaction oc curred preferentially in the grain boundaries with very limited scale at distances up to 1.3 km from the granite contact, although the contact aureole defined by the mineralogical paragenesis is limited to within several tens of meters of the contact.Skeletal graphites growing over the substrata of large hexagonal graphite grains have lower 813C values than those of the host graphite. It is considered that the fine-grained graphite crystals were formed in isotopic equilibrium with low 813C carbon in the metamorphic fluids.

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Section: Isotopic Zonationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stable isotopic evidence for migration of metamorphic fluids along grain boundaries of marbles.

Arita

Wada

1990

Geochem. J.

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The role of the grain boundary at chemical and isotopic fronts in marble during contact metamorphism

Wada

Takamaru

Suzuki

1998

Contributions to Mineralogy and Petrology

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Zircon U–Pb ages on plutonic rocks in the eastern area of 1:200,000 quadrangle, Toyama, central Japan

誠

スイ

侑亮

2021

Bull. Geol. Surv. Japan

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Pb ages of pre-Paleogene plutonic rocks in the area were measured, and the igneous history in the Hida Belt was discussed.Of the Hida Older Granites, the intrusion age of the Hayatsukigawa Granite in the western area is 224.8 ± 1.7 Ma, and that of the Unazuki Granite and Funakawa Granite in the eastern area is 236.5 ± 3.1 Ma and 240.7 ± 4.1 Ma, respectively. The Hayatsukigawa Granite is an independent body from the adjacent augen mylonite, because its intrusion age is different from that (250-240 Ma) of the protolith of the augen mylonite.On the other hand, parts of the Otodani Gabbro and Unazuki Granite in the Geological Map of Japan 1:50,000 "Tomari" area show 195.6 ± 2.0 Ma and 192.0 ± 2.4 Ma, respectively, indicating the intrusion of Early Jurassic time. It was found that these should be classified as the Hida Younger Granites.

show abstract

Polymetamorphism in the Hida metamorphic rocks of upper Katakai river area, Toyama Prefecture, central Japan, with special reference to the effect of intrusion of the Funatsu granitic rocks.

Cited by 3 publications

References 10 publications

Stable isotopic evidence for migration of metamorphic fluids along grain boundaries of marbles.

Stable isotopic evidence for migration of metamorphic fluids along grain boundaries of marbles.

The role of the grain boundary at chemical and isotopic fronts in marble during contact metamorphism

Zircon U–Pb ages on plutonic rocks in the eastern area of 1:200,000 quadrangle, Toyama, central Japan

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