Abstract
K/Rb and ( 87Sr/ 86Sr) 0 ratios were measured for 14 submarine basalts dredged from seamounts in the Pacific Ocean. The K/Rb ranges from 200 to 700, which is significantly lower than that of oceanic ridge tholeiites. Petrographic examination and the low value of K/Rb indicate that seamount basalts are alkaline. Submarine basalts from the east side of the Japan trench have significantly lower ( 87Sr/ 86Sr) 0 than basalts from the Izu-Mariana islands located on the west (continental) side of the trench. This may be explained on the basis of difference in the depth of their magma source region. Samples from Shatsky Rise have comparatively high ( 87Sr/ 86Sr) 0, which may be in accordance with a recent suggestion that Shatsky Rise was a fossil boundary between rigid oceanic plates.
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