Basalt-seawater interaction: trace element and strontium isotopic variations in experimentally altered glassy basalt

Martin Menzies, William E Seyfried

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66 Scopus citations

Abstract

Potassium, Rb and Sr contents and 87Sr/86Sr ratios of basalt glass are greatly modified during experimental alteration by seawater at temperatures of 150-300°C, water/rock mass ratios of 10-125, and 500 bar pressure. In all experiments K and Rb are leached from the rock in amounts which are a function of the temperature of interaction. The water/rock ratio, however, plays a less significant role in the mobility of K and Rb. In contrast, Sr is removed from seawater during interaction with basalt glass and enriched in calcic alteration phases. Concomitantly, interaction with seawater (87Sr/86Sr = 0.70920) increases the Sr isotopic composition of the glassy basalt, from an initial magmatic value of 87Sr/86Sr = 0.70260, to values of 87Sr/86Sr = 0.70512-0.70842. Strontium isotopic variation and trace element mobility documented during this investigation is similar, in many respects, to that inferred from studies of greenstones dredged from mid-ocean ridges, and metabasalts from ophiolites.

Original languageEnglish (US)
Pages (from-to)463-472
Number of pages10
JournalEarth and Planetary Science Letters
Volume44
Issue number3
DOIs
StatePublished - Sep 1979

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