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the nature and origin of authigenic smectites in some recent marine ...

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242 T. G. Cole <strong>and</strong> H. F. Shaw<br />

replac<strong>in</strong>g phenocrysts <strong>and</strong> glass <strong>of</strong> <strong>the</strong> altered basalts (Banks, 1972; Melson &<br />

Thompson, 1973; Scheidegger & Stakes, 1977; Vallier & Kidd, 1977; Seyfried et'al.,<br />

1978; Kurnosov et al., 1982). The saponites form by <strong>the</strong> reaction <strong>of</strong> basalts with juvenile<br />

water or seawater under reduc<strong>in</strong>g alkal<strong>in</strong>e conditions at temperatures rang<strong>in</strong>g from 400~<br />

to normal ocean-bottom temperatures (Kurnosov et al., 1982).<br />

Kurnosov et al. (1982) also concluded that under oxidiz<strong>in</strong>g conditions at relatively low<br />

temperatures (

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