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Rb-Sr age determination is undertaken on biotite and whole rock samples of the differentiated dolerite-monzonite sheets at the Cape of Nosappu, eastern Hokkaido, which are intruded into the middle par...t of the Nemuro Group of Campanian to Paleocene ages. Results are (77±5) m.y. for the monzonite and (67±7)m.y. for the dolerite (Rb λ＝ 1.39 x 10-11/year). It is noted that the age of the monzonite is somewhat older than that estimated by biostratigraphic works.続きを見る
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