Bulletin of the Geological Survey of Japan Vol.50 No.10 (1999)

Cover photograh | Table of Contents |

Cover photograh


Microphotographs of the basic granulite from the Main Zone of the Hidaka metamorphic belt, Hokkaido (left: plain polarized light; right: crossed polarized light)

The basic granulites occur along the western margin of a gabbroic body in the northern part of the metamorphic belt, and they show similarities in chemistry to normal mid-ocean ridge basalts. The rock in the photographs contains plagioclase, brown hornblende, orthopyroxene and clinopyroxene, and it is relatively coarse-grained and rich in pyroxenes. Pyroxenes often occur in contact with plagioclase crystals. The vertical length is about 2.6mm. [See Mikoshiba (Ujiie) in this issue. Sample No. 92100307.]

(Photoed by Masumi UJIIE MIKOSHIBA)

Table of Contents

Chemical characteristics of basic metamorphic rocks from the Main Zone of the Hidaka metamorphic belt, Hokkaido: an affinity to mid-ocean ridge basalts Masumi MIKOSHIBA (UJIIE) (613-634) 50-10_01.pdf(3,157KB)
Subsurface temperature profiles in the Nobi Plain, central Japan Youhei UCHIDA and Yasuo SAKURA (635-659) 50-10_02.pdf(1,974KB)
Ilmenite-series and magnetite-series classfications of the Yanshanian granitoids of South China Shunso ISHIHARA and Ping-an WANG (661-670) 50-10_03.pdf(2,012KB)