Journal article

Variations in the geochemistry of magmatism on the East Pacific Rise at 10°30'N since 800 ka

M Regelous, Y Niu, JI Wendt, R Batiza, A Greig, KD Collerson

Earth and Planetary Science Letters | Published : 1999

Abstract

Samples of volcanic rock, collected from the flanks of the East Pacific Rise at 10°30'N, were used to investigate changes in the geochemistry of magmatism at the ridge axis, over the past 800 ka at this location. We show that there have been large variations in the major element chemistry of the lavas erupted at the spreading axis on this ridge segment over this period. For example, the average MgO content of lavas erupted at the ridge axis increased from about 3.0% at 600 ka, to about 7.0% at 300 ka. Since 300 ka the average MgO content has systematically decreased, and the average MgO content of lavas collected from within the neovolcanic zone at 10°30'N is 6.0%. These temporal changes in ..

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