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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

Trace element composition of Tertiary volcanic rocks of northeast Japan

Mitsuru Ebihara, Yuji Nakamura, Hiroshi Wakita, Hajime Kurasawa, Tadashi Konda
Geochemical Journal, Vol. 18, No. 6, P. 287-295, 1984

ABSTRACT

Abundances of trace elements including rare earth elements (REE) were determined by instrumental neutron activation analysis for twenty three Tertiary volcanic rocks of northeast Japan. Positive correlations were confirmed in the following couples of elements: Hf-La, K-La, Th-La and Fe-Sc. Unlike Quaternary volcanic rocks, Tertiary volcanic rocks show no definite correlation between the inclination of REE patterns and the distance of sampling sites from the estimated volcanic front of the Tertiary. The presence of low alkali tholeiites with relatively flat REE patterns in the Japan Sea side suggests that Tertiary volcanism is qualitatively different from Quaternary one.

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