Rb-Sr and K-Ar isotopic investigations of granodiorites and the associated metamorphic rocks in the Abukuma Plateau, Japan

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  • 阿武隈高原・花崗岩及び変成岩のRb-Sr, K-Ar, 法による研究
  • 阿武隈高原・花崗岩及び変成岩のRb-Sr,K-Ar,法による研究〔英文〕
  • アブクマ コウゲン カコウガン オヨビ ヘンセイガン ノ Rb Sr K Ar

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Abstract

In the Abukuma Plateau, Rb-Sr ages for the biotites of the granodiorites and biotite schist range from 90 m. y. to 160 m. y., increasing generally from the east to the west. K-Ar whole rock ages range from 70 m. y. to 110 m. y., generally decreasing from the east to the west on the contrary to the Rb-Sr ages. The only age obtained from the metamorphic rock is the same as that of the granodiorites around it. The initial (^<87>Sr/^<86>Sr)_0 ratios for the granodiorites are low (0.706±0.002), and those of the biotite schists are 0.712 and 0.706.

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