The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Online ISSN : 1883-0765
Print ISSN : 0021-4825
ISSN-L : 0021-4825
SCHIST XENOLITHS IN ULTRABASIC BODY ACCOMPANIED WITH KUROSEGAWA TECTONIC ZONE IN EASTERN SHIKOKU AND THEIR K-AR AGES
Shigenori MaruyamaYoshio Ueda
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1975 Volume 70 Issue 2 Pages 47-52

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Abstract
Xenoliths in the Kitomyo ultrabasic body (NS-2.5km, EW-4.5km in width) in Kizawa village, Tokushima Prefecture, are composed of mainly amphibolites, psammitic and basic schists with albite spot, quartzose schists, greenstones and sedimentary rocks, the latter two being derived from country rocks. The mode of occurrence, petrographic features and chemical analyses of garnet, chlorite and amphiboles of the metamorphic rocks are described. Petrographically, the low grade schist xenoliths are quite similar to basic and psammitic schist of the Sanbagawa metamorphic belt, and they are distinct from the Terano metamorphic rocks. But the K-Ar ages of muscovites in psammitic and quartzose schist with albite spot are 402 m. y. and 405 m. y. respectively. The significance of the presence of Sanbagawa-type schists in the ultrabasic body of the Kurosegawa tectonic zone is briefly discussed.
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