ABSTRACT

Isotope ratios measured for selected Japanese ore leads are corrected to the absolute scale and compared with some available data for other Japanese samples. The isotopic feature pointed out in the previous work is confirmed: The data for the Miocene vein-type deposits are very similar to the lead isotope ratios available for the Miocene strata-bound (Kuroko) deposits, northern and central Honshu volcanic rocks and pelagic sediments near the Japan Trench.