Presentation Information
[R6P-07]Sr-Nd isotopic composition of Miocene felsic volcanic rocks
in the Kamo area, Niigata Prefecture
*Naoki TAKAHASHI1, Toshiro TAKAHASHI2 (1. Niigata Univ. Sci, 2. Niigata Univ. Sci)
Keywords:
Volcanic rocks,Felsic volcanic rock,NE Japan arc,Miocene
Miocene felsic volcanic rocks in the Kamo area, Niigata Prefecture, can be divided into two groups, E-group (17-14Ma) and D-group (11-8Ma), based on the age and the geochemical features. Sr-Nd isotopic compositions of the E-group rhyolite indicate that it may have been formed by partial melting of lower crust. On the other hand, the geochemical features of D-group rhyolite suggest that they were formed by differentiation from mafic magma and assimilation of crustal materials.
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