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Ryoke Zone of the Toyone-Mura Area, Aichi Prefecture, Japan*

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Ryoke Zone of the Toyone-Mura Area, Aichi Prefecture, Japan* J. Japan. Assoc. Min. Petr. Econ. Geol. 69. 52-74, 1974 PETROLOGY OF THE GABBROIC ROCKS IN THE RYOKE ZONE OF THE TOYONE-MURA AREA, AICHI PREFECTURE, JAPAN* TOSHIO KUTSUKAKE Department of Geology and Mineralogy, Faculty of Science, Kyoto University, Kyoto, Japan have genetical relations such as co-magma INTRODUCTION tic ones to the Ryoke granites or not, and In the Ryoke zone, gabbroic rocks occur the nature of the metamorphism, they have sporadically as small masses in both gra suffered, are still to be elucidated. nites and metamorphic rocks. These have During his work on the Ryoke meta been named "biotite-quartz diorite" (Dbq) morphic rocks of the Toyone-mura area, the in the Geological Map 1:75,000 of the Geol. author's attention was called to these pro Surv. of Japan (Notomi, 1924), but they blems of the gabbroic rocks. In this paper, are generally pyroxene-bearing hornblende their mode of occurrence, petrography, che gabbros and/or norites, frequently accom mistry and mineralogy are described and panied by cortlandite. their genesis and metamorphism will be The gabbroic rocks in the Ryoke zone discussed in some detail. have been studied by several authors (Yoshi mura, 1940; Yagi, 1944; Yoshizawa, 1949, GEOLOGICAL OUTLINE 1950, 1951, 1952; Suwa, 1961; Soma, 1963; Toyone-mura area occupies the south Kutsukake, 1973a). However, whether they eastern part of the Ryoke zone in central Fig. 1. Geological map of the Toyone-mura area. Legend 1: Alluvium, 2: Debris, 3: Terrace deposits, 4: Basalt and andesite, 5: Dacite, 6: Rhyolite, 7: Tertiary sediments, 8: Sambagawa schists, 9: Busetsu granite, 10: Inagawa granite, 11: Mitsuhashi granite, 12: Tenryukyo granite, 13: Kamihara quartz diorite, 14: Fine grained biotite granodiorite, 15: Mylonite, 16: "Halleflinta," 17: Gabbro, 18: Metadiabasic rock, 19: Hornfels, 20: Micaschist and quartzschist, 21: Gneiss, 22: Marble , 23: Metamorphic rock derived from "Schalstein," 24: Fault. M. T. L.: Median Tectonic Line , I. S.T. L.: Itoigawa - Shizuoka Tectonic Line. Locality name As: Asakusa, Ch: Chausu-yama, Fu: Futto, Ha: Hanare-yama , Ho: Hongo, Hy: Hiyosawa, Ib: Ichibara, In: Inoshikori, Ka: Kami-Awashiro, Ko: Kobayashi, Kt: Kakino taira, Md: Midashi, Mk: Makinoshima, Ms: Misono, Ni: Niino-toge, Ns: Nakashitara , Od: O dachi, Oh: Ohata, Oi: Oiwa-dake, Os: Osawa, Oz: Ozasa-yama, Sk: Shimo-Kurokawa , So: Sogawa, Su: Sakauba, Tk: Tashika, Ts: Tsugawa, Tw: Tawagane-toge, Uk: Urakawa, Ur: Ure , Zn: Zinno-yama. * Presented in Part at the 80th Annual Meeting of the Geological Society of Japan , held in Sendai, on April 4, 1973 (Kutsukake, 1973b). (Manuscript received, October 3, 1973) Petrology of the gabbroic rocks in the Ryoke zone of the Toyone-mura area 53 54 T. Kutsukake Japan. Preliminary report of geology of Three gabbroic masses are found, one this area has been presented (Kutsukake, of which is in metamorphic rocks and other 1970). two are in granites. Conveniently they are In the southeastern part of the area, called the Inoshikori-, Tashika-, and Ohata granitic rocks (the Tenryukyo granite) oc mass respectively. cupy the wide extention and in the central MODE OF OCCURRENCE and western parts, metamorphic rocks ex ceed granitic rocks in extent. Especially (1) The Inoshikori mass in the central part, the basic metamorphic This mass is the largest of three. It rocks, which are metadiabasic rocks differ occurs in gneiss, and is intruded by medium ent from the gabbros of the present subject, grained gneissose biotite granodiorite, a occur as large mass. Geological map is member of the Kamihara quartz diorite, shown in Fig. 1. which is one of the oldest granitic rocks in Based on the mineralogical variations in the Ryoke zone in central Japan (Ryoke pelitic rocks, it is inferred that the meta Research Group, 1972). And the mass is morphic grade increases to the centre from accompanied by fine-grained diabasic rocks both the eastern and western sides. The of xenolithic form. eastern limit part belongs to the cordierite The mass occupies an area of approxi zone, the neighbouring eastern and the mately two square kilometres. western parts to the first silimanite zone, and the central part to the second silliman ite zone, defined by Hayama (1960, 1964) respectively. Fig. 2. Route-map along the road from Sakauba to Inoshikori. 1. Tertiary dyke rock, 2: Medium-grained gneis sose biotite granodiorite, 3: Metadiabasic rock, Fig. 3. Route-map along the road from 4. Micaschist and quartzschist, 5. Gneiss, 6. Tashika to Shin-toyone dam. Aplite, 7. Quartz gabbro, 8. Hornblende gabbro, 1. Tenryidkyo granite, 2. Kamihara quartz 9. Olivine-hornblende norite and hornblende no diorite, 3. Metadiabase, 4. Quartzofelds rite, 10. Olivine norite. pathic gneiss, 5. Hornblende gabbro. Petrology of the gabbroic rocks in the Ryoke zone of the Toyone-mura area 55 Route-map along the road from Saka grained plagioclase-porphyritic biotite gra uba to Inoshikori is shown in Fig. 2. nodiorite intruded into the mass. Moreover, a biotite granite dyke of 50cm width occurs. (2) The Tashika mass Route-map across the centre is shown It is composed of several separate bodi in Fig. 4. es, occurring between the Kamihara quartz PETROGRAPHY diorite and the Tenryukyo granite. It occurs as dyke-foim in the quartzofeldspa (1) The Inoshikori mass thic gneiss, including the latter's blocks as This mass is mainly composed of the xenolith. The rock is homogeneous horn following rocks: blende gabbro throughout the bodies. 1) Olivine norite, Route-map along the road from Tashika 2) Olivine-hornblende norite, to the Shin-toyone dam is shown in Fig. 3. 3) Norite, 4) Hornblende norite, (3) The Ohata mass 5) Hornblende gabbro, It occurs in the Tenryukyo granite with 6) Quartz gabbro, and 700m•~1000m area, mainly composed of 7) Metadiabasic rock. pyroxene-hoinblende gabbro and hornblende Of these, the last one is xenolithic and gabbro. Fine-grained quartz diorite occupi also found in the surrounding gneissose es the inner portion of the mass, and fine granodiorite as xenolith. Other rock types gradually grade into one another, and no sharp boundary is detectable between them. Hornblende norite is the most predominant rock type in the mass. Olivine-hornblende norite and hornblende gabbro occur spora dically in hornblende norite. Olivine norite occupies the western limit part and quartz gabbro the eastern limit part of the mass respectively. Norite is found at the southern margin of the mass. 1) Olivine norite (Fig. 5 A) The rock is medium-grained and dark greenish in colour. In thin slice, it shows hypidiomorphic-poikilitic texture. It is mainly composed of plagioclase, hypersthene, olivine, hornblende, augite and Fig. 4. Route-map cross the centre of the cummingtonite. Ohata mass. Plagioclase and olivine are enclosed by 1. Tertiary sediments, 2. Tenryukyo granite, hypersthene and augite which in turn are 3. Aplitic biotite granite, 4. Fine-grained plagio clase-porphyritic biotite granodiorite, 5. Fine-gr enclosed by hornblende and cummingtonite. ained biotitequartz diorite, 6. Medium-grained Between olivine and plagioclase, pale green augite-hornblende gabbro, 7. Medium-grained hornblende-spinel association is found. hornblende gabbro, 8. Medium-grained two pyro xene-hornblende gabbro. Plagioclase is idiomorphic and free from 56 T. Kutsukake Fig. 5. Photomicrographs of the gabbroic rocks. (Cross-nicols) A. Olivine norite, Specimen No. 73072304, Inoshikori mass. B. Olivine-hornblende norite, Specimen No. 73030601, ditto. C. Norite, Specimen No. 70092005, ditto. D. Hornblende norite, Specimen No. 72090810, ditto. E. Intensely metamorphosed gabbro, Specimen No. 72090807, ditto. F. Hornblende gabbro, Specimen No. 73072303A, Tashika mass.Ol . olivine, Hy. hypersthene, BHo. brown hornblende, Bi: biotite, Mg. magnetite, Sp. spinel, Pl. plagioclase, Ch. chlorite Petrology of the gabbroic rocks in the Ryoke zone of the Toyone-mura area 57 zoning, showing polysynthetic twinning. n1 ƒÀ =1.704 , ƒÁ=1.707, (-) 2V=58.5•K. Rim =1.578 on cleavage flake (An 94) . Olivine hypersthene around olivine gives (-) 2V= is rounded crystal, along its crack numer 56.5•K. Augite is small in quantity, and ous dusty opaque minerals are developed. always associated with hypersthene, partly ƒÁ =1.764, (-) 2V=77•K. Hypersthene, with replaced by hornblende. ƒÀ=1.684, (+) 2V exsolution lamellae parallel to (100) plane, =53.5•K, c•ÈZ=43•K. Hornblende is poikilitic, is hypidiomorphic and frequently embraced enclosing plagioclase and hypersthene. It by cummingtonite, sometimes by horn has exsolution lamellae of cummingtonite blende. ƒ¿=1.699, ƒÀ=1.710, ƒÁ=1.712, (-) parallel to (001). It is pleochroic with X= 2V=50•K. Augite occurs usually intergrown very pale yellow, Y=yellowish brown, Z= with hypersthene, and is embraced by brown. ƒ¿=1.658, ƒÀ=1.674, ƒÁ=1.682, c•ÈZ= brown hornblende. ƒÀ=1.692, c•ÈZ=39•K, (+) 19•K, (-) 2V=80•K. Cummingtonite occurs as 2V=41•K. Cummingtonite is embraced by two fashions: one is associated with horn hornblende with common b-axis. Horn blende in parallel intergrowth, and has blende occurs as poikilitic crystal enclosing exsolution lamellae of hornblende. It in other minerals. Pleochroism is as follows: cludes hypersthene poikilitically. The other X=pale yellow, Y=yellow brown, Z= is replacing hypersthene. The former has brown. a=1.652, ƒÀ=1.664, ƒÁ=1.676, c•ÈZ= ƒÁ =1 .678, c•ÈZ=19•K, (+) 2V=82•K, and the 18•K, (-) 2V=77•K. Hornblende, associated latter c•ÈZ=18.5•K, (+) 2V=80•K. Biotite with spinel, is pale green in colour and has occurs also as two fashions; one is deve ill-form. ƒÁ=1.665, (-) 2V=88•K. Spinel is loped around iron ore, the other is replac small grain and deep green (pleonaste). ing hornblende. The latter is pleochroic Minor constituents: Magnetite, ilmenite, with X=yellow, Y=Z=orange brown.
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