JOURNAL OF MINERALOGY, PETROLOGY AND ECONOMIC GEOLOGY
Online ISSN : 1881-3275
Print ISSN : 0914-9783
ISSN-L : 0914-9783
K-Ar ages of the Miocene volcanic rocks from the Tomari area in the Shimokita Peninsula, Northeast Japan arc
Naoki WATANABEToshiaki TAKIMOTOKenji SHUTOTetsumaru ITAYA
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1993 Volume 88 Issue 7 Pages 352-358

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Abstract

The Miocene Tomari volcanic rocks occurring in the Shimokita Peninsula, Northeast Japan arc were dated by K-Ar method. The results show that all the Tomari volcanic rocks have almost similar K-Ar ages of about 13-15 Ma, although they were stratigraphically divided into five units. This indicates that all these volcanic units in the Tomari area were formed by a nearly simultaneous volcanism of Middle Miocene age along the northern-most portion of the volcanic front of 13-16 Ma, which lie 30-50km east of the Quaternary volcanic front.

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© Japan Association of Mineralogical Sciences
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