Age of volcanism and its migration in the Samoa Islands
Potassium-argon (K-Ar) ages on whole rock samples have been measured on lavas from the subaerial Samoa Islands, which form a broadly linear volcanic chain that extends from the ESE to the WNW for about 360 km. The Manu'a Islands near the southeast limit of the chain exhibit youthful ages, with most <0.4 Ma, in keeping with the geological observations. Tutuila consists of several volcanoes, and previous work yielded a mean K-Ar age of 1.26 ± 0.15 Ma for the shield-building volcanism. Upolu, to...[Show more]
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