Stability of the Natural Remanent Magnetization of Kawajiri-Misaki Basalts, Yamaguchi, Japan.

The test specimens submitted to the present study were originally taken from the so-called 'intermixing polarity zone', at which were found both the normail and reversed natural remanent magnetization (nrm) of early Quaternary basalts in Kawajiri-Misaki (Cape Kawajiri) district, Northern Seaside of Yamaguchi Prefecture, West Japan. The kawajiri basalts consist mainly of Olivine basaltic flow in which are sandwiched a few lapilli tuffs and they are considered to have undergone no conspicuous dynamic disturbances since their eruption in the late Pliocene or the early Pleistocene age (Kurasawa & Takahashi 1960, Oji 1961, Lkamoto & Imamura 1964, Okamoto 1965). The lowest of Kawajiri basaltic flows shows the 'positional intermixing' of the nrm polarities, both normal and reversed nrm within the single flow (Asami, Domen & Yoshidomi 1954, Asami 1957). The contained ferromagnetic rock forming minerals of these basalts are mainly magnetites, titano-magnetic analyses