Figure F2. Sr isotope ratios versus the reciprocal of Sr concentration in the pore water samples, Site C0020. The end-member Sr isotope ratios for seawater (SW) are from McArthur et al. (2012) assuming the ratios for seawater younger than middle Miocene (0.7092–0.7088). The volcanic material (VM) end-member covers the Sr isotope ratios reported for northeast Japan (Oba et al., 1983; Kurasawa et al., 1986; Ohki et al., 1994). The mixing line clearly shows the contribution of Sr from both sources.
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