K-Ar age of the Tanigawadake Pliocene plutonic body, North Fossa Magna, central Japan.
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概要
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Biotite separates from granodiorites of the Tanigawadake Pliocene plutonic body, North Fossa Magna, central Japan were dated by K-Ar method. The ages range from 3.91±0.27 Ma to 2.9±2.4 Ma. Petrological and mineralogical features suggest that the youngest granodiorite is an intrusion into the Tanigawadake Pliocene plutonic body. Relationship between altitude and ages of rocks inferred that uplift rate of the Tanigawadake Pliocene plutonic body was about 1, 400 m/Ma during 3.91-3.40 Ma. This value suggests that the North Fossa Magna region experienced at least 5, 500m of uplift which is in accordance with the previous conclusion expressed by other workers.
- 日本鉱物科学会の論文
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