Staurolite-bearing gneiss and re-examination of metamorphic zonal mapping of the Higo metamorphic terrane in the Kosa area, central Kyushu, Japan

Maki, Kazushige; Ishizaka, Yoshihisa; Nishiyama, Tadao

doi:10.2465/jmps.99.1

Cited by 16 publications

(32 citation statements)

References 13 publications

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“…The main part of the Higo metamorphic rocks is characterized by high T/P type metamorphism, although some features of earlier, medium pressure metamorphism have been noted, such as staurolite (Osanai et al, 1995;Maki et al, 2004). Some anatectic features, such as migmatites, and granitic segregates and veins have been documented in the highest grade zones, i.e., the amphibolite to granulite facies grade zones (Obata et al, 1994), which are the subject of this study.…”

Section: Geological Outlinementioning

confidence: 95%

“…Recently, the Kosa area has been re mapped by Maki et al (2004), who claim that the garnet cordierite stability zone (zone D) is wider than previously thought, and that the C zone cannot be defined in this area. Because this change of subdivision does not affect the following treatment, we use the Nagakawa et al (1997) subdivision in this paper.…”

Section: Geological Outlinementioning

confidence: 99%

“…Both natural and synthetic materials were used for standards, and the ZAF correction was applied to X ray intensity data. For more detailed description of extensive chemical analyses of rocks, the reader is referred to Yoshimura (2004) and Maki et al (2004).…”

Section: Petrography and Field Relationshipmentioning

confidence: 99%

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Diatexite and metatexite from the Higo metamorphic rocks, west-central Kyushu, Japan

Kobayashi

Obata

Yoshimura

2005

Journal of Mineralogical and Petrological Sciences

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A variety of anatectic migmatites occur in high grade zones of a Mesozoic high T/P typemetamorphic belt the Higo metamorphic belt, Kyushu, Japan. This paper deals with two major lithotypes of the migmatites metatexite and diatexite and attempts to characterize them in terms of field occurrence, texture, mineralogy and whole rock chemistry. The metatexite is a layered migmatite that is composed of leucosome and melanosome with metamorphic fabrics, while diatexite is a massive and more homogeneous type and has plutonic igneous textures. Both types of migmatite occur in a high grade garnet cordierite zone (D zone) and an even higher grade garnet hypersthene zone (E zone) of the Higo metamorphic belt, and they are both considered to represent the products of partial melting of pelitic and psammitic gneisses. The diatexite occurs in masses, sporadically, in the matrices of metatexite both in the D zone and E zone, and it does not appear to increase in abundance with the increase of metamorphic grade. Another important finding is that no systematic compositional difference has been detected between the metatexite and the diatexite despite their textural and structural differences, if compared within the same D zone. Treating the metatexite and diatexite together, it was shown that the E zone migmatites are chemically and mineralogically more depleted than the D zone migmatites, which may imply that the former represents the refractory residues of partial melting. Some leucogranites, which form veins, dikes and pods in metamorphic rocks, have compositions of anatectic melts and are considered to be compositionally complementary to the residual E zone migmatites. Although the D zone rocks must also have been partially molten at the peak of metamorphism, melt segregation probably did not take place effectively there, and, as a whole, they largely retain their original metasedimentary composition. The factor controlling the structural types of the migmatite is also discussed.

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Section: Geological Outlinementioning

confidence: 95%

Section: Geological Outlinementioning

confidence: 99%

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Diatexite and metatexite from the Higo metamorphic rocks, west-central Kyushu, Japan

Kobayashi

Obata

Yoshimura

2005

Journal of Mineralogical and Petrological Sciences

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“…(b) Sangun Belt (Hashimoto, 1968;Kano, 1981;Karakida, 1987;Tsujimori, 1988), Hida marginal Belt (Banno, 1958;Ito, 1977Ito, , 1979Miyagawa, 1982;Nakamizu et al, 1989). (c) Constituents of the Paleo-Ryoke Belt (Takagi and Shibata, 2000); Higo Belt (Karakida and Yamamoto, 1982;Maki et al, 2004;Osanai et al, 1998;Owada et al, 2005;Yamamoto, 1962;Yoshimura, 1995;Editoral Committee of Ogawa Town History, 1999), Oshima metamorphic rocks (Shikano et al, 1990), Maana Belt (Takeda et al, 1993), Kinshozan and Yorii metamorphic rocks (Arai et al, 2000;Takagi, 1991). (d) Ryoke Belt Enami, 1988;Endo and Yamazaki, 2013;Ono, 1977;Nureki et al, 1982).…”

Section: Unroofing In the Otonashigawa Accretionary Sequencementioning

confidence: 99%

How are the roofing and unroofing processes reflected in sandstone composition? —A case study in the Shimanto Belt, Kii Peninsula, southwestern Japan—

Bessho

2015

Jour. Sed. Soc. Japan

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1＊Multi-approach studies combining modal, heavy mineral and garnet analyses of sandstones have been carried out on the Late Cretaceous Terasoma Formation and the Palaeogene Otonashigawa Accretionary Sequence (AS) of the Shimanto Belt in the Kii Peninsula, Southwest Japan. Modal compositions of the Terasoma Formation change upward from feldspathic wacke to lithic wacke. Heavy mineral assemblages also change upward from the one rich in zircon and garnet with epidote, titanite and allanite to the one rich in euhedral zircon. The garnets from the Lower Member are mostly almandine, low and intermediate P/T types with minor high P/T type and grandite. In the Middle Member, the proportion of low P/T type increases at the expense of high P/T type and grandite garnets. These trends suggest that Coniacian violent felsic magmatism took place and their products thickly roofed the basement rocks. Modal compositions of the Haroku formation in the Otonashigawa AS change upward from lithic wacke to feldspathic arenite. The heavy mineral assemblages of the lower members are rich in zircon and garnet accompanied by allanite and greenish-brown hornblende. Sandstones of the uppermost member contain abundant epidote, allanite and titanite. The chemical compositions of detrital garnets also show a decreasing trend of the pyrope-rich almandine (intermediate P/T type garnet) and an increasing trend of spessartine-rich almandine (low P/T type garnet) from the lower to upper members. A few grandites were extracted from the uppermost horizon. These data suggest that felsic volcanic products and intermediate to high grade metamorphic rocks are the probable sources of the Otonashigawa AS. Due to the successive erosion, granitic, low P/T metamorphic rocks and calcareous metamorphic rocks were exposed to the surface. Roofing and unroofing processes are especially suggested by changes of the proportion of euhedral zircon, allanite, spessartine-rich almandine garnet (L), high P/T garnet and grandite garnet.

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“…Both decompressional heating (Osanai et al. , 1996) and isobaric heating (Maki et al. , 2004; Miyazaki, 2004) followed by decompressional cooling (Osanai et al.…”

Section: Geological Settingmentioning

confidence: 99%

Prograde P–T path of medium‐pressure granulite facies calc‐silicate rocks, Higo metamorphic terrane, central Kyushu, Japan

Maki

Fukunaga

Nishiyama

et al. 2009

Journal Metamorphic Geology

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Prograde P-T path of medium-pressure granulite facies calc-silicate rocks, Higo metamorphic terrane, ABSTRACT This paper reports an occurrence of medium-pressure granulite facies calc-silicate rocks intercalated with pelitic gneisses in the Higo metamorphic terrane, central Kyushu, Japan, which is classified as a low-P ⁄ high-T (andalusite-sillimanite type) metamorphic belt. Three equilibrium stages are recognized in the calc-silicate rock based on reaction textures: M1 stage characterized by an assemblage of porphyroblastic garnet + coarse-grained clinopyroxene + plagioclase included in the clinopyroxene; M2 stage by two kinds of breakdown products of garnet, one is plagioclase + coronitic clinopyroxene within garnet and the other is plagioclase + vermicular clinopyroxene surrounding garnet; and M3 stage by amphibole replacing clinopyroxene. The key assemblage in the calc-silicate rock common to M1 and M2 stages is Grt + Cpx + Pl ± Qtz, which constrains the pressure and temperature (P-T) conditions for these stages by Fe-Mg exchange reaction and the two univariant net-transfer reactions: 2Grs + Alm + 3Qtz = 3Hd + 3An or 2Grs + Prp + 3Qtz = 3Di + 3An. The P-T conditions for M1 and M2 stages were estimated to be about 8.4 ± 1.9 kbar and 680 ± 122°C, and 6.7 ± 1.9 to 8.9 ± 2.2 kbar and 700 ± 130 to 820 ± 160°C, respectively. Estimates are consistent with an isobaric heating P-T path. The high peak temperature conditions at normal crustal depths and the prograde isobaric heating path probably require heat advection due to melt migration during the high-T metamorphism.Key words: an isobaric heating P-T path; calc-silicate rock; Higo metamorphic terrane; low-pressure and high-temperature metamorphism; pervasive melt migration.

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Staurolite-bearing gneiss and re-examination of metamorphic zonal mapping of the Higo metamorphic terrane in the Kosa area, central Kyushu, Japan

Cited by 16 publications

References 13 publications

Diatexite and metatexite from the Higo metamorphic rocks, west-central Kyushu, Japan

Diatexite and metatexite from the Higo metamorphic rocks, west-central Kyushu, Japan

How are the roofing and unroofing processes reflected in sandstone composition? —A case study in the Shimanto Belt, Kii Peninsula, southwestern Japan—

Prograde P–T path of medium‐pressure granulite facies calc‐silicate rocks, Higo metamorphic terrane, central Kyushu, Japan

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