Other
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..229b&link_type=abstract
Earth and Planetary Science Letters, Volume 62, Issue 2, p. 229-238.
Other
8
Scientific paper
A deposit consisting almost exclusively of the Mg-silicate sepiolite has been sampled from the Owen transform zone in the western Indian Ocean. This deposit is associated with basaltic, gabbroic and ultramafic rocks. On the basis of major, trace and rare earth elemental composition, strontium and oxygen isotopic ratios, as well as of theoretical considerations, the sepiolite deposit appears to have formed neither from seawater nor from solutions resulting from the interaction of seawater with the basaltic crust. Interaction of ultramafic rocks with seawater circulating in the crust, particularly in transform zones, may produce solutions which at low temperature (<100°C) become enriched in Mg and/or Si, and can give rise to precipitation of sepiolite on or below the sea floor. The ratio of Mg to Si in the solutions is probably a factor in determining whether sepiolite or another Mg-silicate (i.e., one of the serpentine polymorphs) is deposited.
Bonatti Enrico
Breger D.
Craig Simmons E.
Hamlyn Paul R.
Lawrence Joseph
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