On the amphibolitic rocks of the upper course of Syumbetsu River, Hidaka, Hokkaido
The Journal of the Japanese Association of Mineralogists Petrologists and Economic Geologists (1961)
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Abstract:
In this paper is presented a detailed subdivision of socalled gabbro-amphibolite zone of the Hidaka metamorphic belt, the axis of island of Hokkaido. It is composed of four tectonic units which are arranged in the following order from west to east, as is shown in figure I. 1) green schist zone, 2) epidote amphibolite zone, 3) green hornblende schistose amphibolite zone and 4) saussurite gabbro zone. Concerning zones 1), 2) and 3), their original rock facies are not clearly determinable. The zone of saussurite gabbro is composed of three varieties of amphibolite, a) hornblende schist facies, b) coarse grained amphibolite (=metasomatic) facies and c) compact amphibolite facies, all of which are derived from saussurite gabbro. In such a diverse metamorphic process, the different characters of tectonic forces and combined metasomatic effects have been the chief determinants.Keywords:
Hornblende
Metasomatism
Hornblende
Ilmenite
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Hornblende
Lile
Fractional crystallization (geology)
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The Journal of the Japanese Association of Mineralogists Petrologists and Economic Geologists (1962)
Abstract: A small ultramafic body which is a member of the Hayachine ultramafic complex crops out at Kagura, Kawai district, central Kitakami mountainland. This Kagura body consists of serpentinite, serpentinized pyroxene peridotite, pyroxenite, hornblende hornblende pyroxenite or pyroxene hornblendite, hornblendite, pyroxene hornblende gabbro, hornblende gabbro and hornblende gabbro pegmatite. And a little rodingitic rocks occur as wein like form within gabbroic rocks. The petrochemical features of the Kagura body and discussed by means of the chemical analyses of thirteen representative rocks. It is seemed that all the rock types are derived from and ultramafic magma in the order listed above and are formed by the succession of noted below: peridotite dunite pyroxene peridotite hornblendite (largely liquid) hornblende gabbro pyroxene hornblendite (liq.+cryst.) pyroxene hornblende gabbro hornblende gabbro pyroxenite. (largely crystalline) hornblende gabbro pegmatite Some opinion on the chemical character of the rodingitic rocks which are formed by hydrothermal reaction is give.
Hornblende
Peridotite
Ultramafic rock
Pyroxene
Pegmatite
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The Journal of the Japanese Association of Mineralogists Petrologists and Economic Geologists (1987)
Gabbroic rocks and granites are exposed in the Konoyama hill, Kinki district, Japan. The gabbroic body is composed of the following five rock-types: 1. hornblende gabbro, 2. pyroxene-olivine-hornblende gabbronorite, 3. leucocratic hornblende-gabbro, 4. pyroxene-hornblende gabbronorite and 5. cortlandite. Hornbende gabbro is the most dominant rock. Pyroxene-olivine-hornblende gabbronorite and pyroxene-hornblende gabbronorite sporadically occur in hornblende gabbro. Cortlandite is found as local facies of hornblende gabbro. These rock-types have gradational relations one another. The gabbroic and metamorphic rocks have no sign of intrusive relations. The granitic rocks intruding into the gabbros are tonalite, gneissose granodiorite, weakly schistose granite and fine-grained granite. Chemistry of the gabbroic rocks is characterized by low K2O and Rb contents. Plagioclases are highly calcic. On the other hand, Mg/Mg+Fe ratios of ferromagnesian minerals are rather low in a range from 0.70 to 0.73. These features suggest that the gabbroic rocks were formed under high vapour pressures.
Hornblende
Pyroxene
Anorthosite
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Hornblende gabbro-lamprophyre-diorite Complex in Guwoonri, Hwacheon distributes in a zonal pattern, where the diorite distributed along the margin of the Complex encompasses the hornblende gabbro body in the central part of the Complex, and lamprophyre intruded in vein along the boundary between diorite and hornblende gabbro. The hornblende gabbro in the central part of the Complex also shows a zonal distribution pattern, where hornblende gabbro containing subspherical amphibole phenocrysts as a major mafic mineral(Sag) surrounds hornblende gabbro with prismatic amphiboles as a principal mafic mineral(Pag). The zonal distributions observed in hornblende gabbro-lamprophyre-diorite Complex in Guwoonri resulted from two different geological processes. The zonal distribution among diorite, lamprophyre, and hornblende gabbro was due to intrusions of three distinct magmas derived from different degree of partial melting of a common source rock, whereas the zonal distribution shown within the hornblende gabbro body occupying the central part of the Complex resulted from an inward fractional crystallization of a single magma. Geochemical characteristics and mineral mode of hornblende gabbro, lamprophyre, and diorite indicate that these rocks formed from hydrous mafic to intermediate magma derived from partial melting of enriched mantle, which has been caused by infiltration of volatiles including water into mantle in plate margin.
Hornblende
Diorite
Amphibole
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The Journal of the Japanese Association of Mineralogists Petrologists and Economic Geologists (1963)
Hornblende gabbro, diorite and gabbro-diorite occur in the sheared zone of biotite gneiss and basic hornblende plagioclase rocks. Careful observations on the occurrence of these rocks and the comparison of the component minerals between the coarse igneous textured rocks and the country metamorphic rocks have revealed that the basification and the acidification of plagioclase occur more intensively in igneous textured rocks than in metamorphic rocks, and moreover quality of the country metamorphic rocks provide for that of gabbro and diorite and the regulation is not vice versa. Consequentry, these igneous textured rocks in these districts are the metablastic rock originated from the country rocks, from which it is produced by metamorphic differentiation.
Diorite
Hornblende
Country rock
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