Rb-Sr dating of the Yatsushiro granite and gneiss, Kyushu, Japan

Details Rb-Sr dating of the Yatsushiro granite and gneiss, Kyushu, Japan Rb-Sr dating of the Yatsushiro granite and gneiss, Kyushu, Japan

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973e%26psl..20..140n&link_type=abstract

Earth and Planetary Science Letters, Volume 20, Issue 1, p. 140-144.

Physics

Scientific paper

Rb-Sr measurements on the Yatsushiro granite and gneiss, which had been considered stratigraphically to be of possible Precambrian age, are reported. The whole rock isochron for the granite gives an age of 352 +/- 8 my with a low initial 87Sr/86Sr ratio of 0.7037 +/- 0.0006. Data for constituent minerals of the granites are dispersed irregularly around the whole rock isochron (possibly by later tectonic events). For the gneiss, a metamorphic event around 410 my is indicated by the muscovite Rb-Sr ages. The present results do not support the possibility that the Yatsushiro granite and gneiss are Precambrian in age. Present address: College of General Education, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto, Japan.

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