208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku.

S. Maruyama, Y. Ueda, S. Banno

Research output: Chapter in Book/Report/Conference proceedingChapter

20 Citations (Scopus)

Abstract

A new member of the Kurosegawa tectonic zone was found in serpentinite near Kochi City, SW Japan. These rocks are high-P, low-T schists derived from basalt and chert. Three metamorphic events can be deciphered in the high-P schists, based upon the texture and mineral paragenesis: first, low-P metamorphism at intermediate to high grade; second, high-P, low-T metamorphism of the jadeite-glaucophane facies; and the third, retrograde crystallization of the second stage high-P schists within the stability field of lawsonite + pumpellyite + glaucophane. Further, analcite formed, replacing jadeite. The second and third stages of metamorphism can be distinguished on pyroxene mineralogy: jadeite + quartz were stable in the second, but albite + quartz + aegirine-jadeite were stable in the third. Not all the high-P, low- T schists suffered low-P metamorphism before they were metamorphosed by the high-P stage; some basaltic rocks changed directly to high- P, low-T schists. Two muscovites in the schists gave K/Ar ages of 208-240 m.y., and a relic igneous biotite, partly replaced by chlorite, gave 225 m.y. These values differ not only from those of the Sanbagawa schists, but also from the other members of the Kurosegawa zone. (Following abstracts)M.Ak.

Original languageEnglish
Title of host publicationJournal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists
Pages300-310
Number of pages11
Volume73
Publication statusPublished - 1978
Externally publishedYes

Fingerprint

jadeite
glaucophane
schist
tectonics
metamorphism
quartz
lawsonite
aegirine
pumpellyite
serpentinite
paragenesis
chert
city
albite
muscovite
rock
pyroxene
chlorite
biotite
mineralogy

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Maruyama, S., Ueda, Y., & Banno, S. (1978). 208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku. In Journal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists (Vol. 73, pp. 300-310)

208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku. / Maruyama, S.; Ueda, Y.; Banno, S.

Journal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists. Vol. 73 1978. p. 300-310.

Research output: Chapter in Book/Report/Conference proceedingChapter

Maruyama, S, Ueda, Y & Banno, S 1978, 208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku. in Journal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists. vol. 73, pp. 300-310.
Maruyama S, Ueda Y, Banno S. 208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku. In Journal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists. Vol. 73. 1978. p. 300-310
Maruyama, S. ; Ueda, Y. ; Banno, S. / 208-240 m.y. old jadeite-glaucophane schists in the Kurosegawa tectonic zone near Kochi City, Shikoku. Journal of the Japanese Association of Mineralogists, Petrologists & Economic Geologists. Vol. 73 1978. pp. 300-310
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