Technical Comments

Comment on "A Vestige of Earth's Oldest Ophiolite"

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Science  02 Nov 2007:
Vol. 318, Issue 5851, pp. 746
DOI: 10.1126/science.1144931


The claim by Furnes et al. (Reports, 23 March 2007, p. 1704) that Greenland metavolcanic rocks require Paleoarchean sea-floor spreading is incompatible with their own data. The purported sheeted dikes have the composition of pyroxenitic komatiite and could not have fed the adjacent ferroandesitic pillow lavas. Neither type has ophiolitic analogs, and both are likely ensialic.

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