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Figure F17. IW chemistry at Tiarei marginal sites. Chemical changes at ~18 mbsf reflect the presence of a barrier to diffusion, which corresponds to the depth of a large basalt boulder recovered and the presence of a strong seismic reflection. A. pH. B. Alkalinity. C. Ammonia. D. Chloride. E. Mg. F. K. G. Ca H. Sr. (Continued on next page.)

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