Serpentinization of oceanic peridotites: temperature dependence of mineralogy and boron content

Details Serpentinization of oceanic peridotites: temperature dependence of mineralogy and boron content Serpentinization of oceanic peridotites: temperature dependence of mineralogy and boron content

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..70...88b&link_type=abstract

Earth and Planetary Science Letters, Volume 70, Issue 1, p. 88-94.

Physics

28

Scientific paper

Serpentine mineralogy, 18O/16O ratios and boron content were determined in equatorial Atlantic serpentinized ultramafic rocks of mantle derivation. The oxygen isotope data were used to estimate the temperatures of serpentinization. A relationship appears to exist between temperature of serpentinization, mineralogy of the serpentinites and their boron content. Orthochrysotile is the dominant serpentine phase in the ~ 200-120°C range of serpentinization temperatures. Lizardite and ``polygonal serpentine'' are dominant in the ~ 120-80°C range, and clinochrysotile and lizardite in the ~ 80-30°C temperature range. These results are interpreted in terms of P-T stability of serpentine phases and of changes in chemistry of circulating seawater during ascent of the ultramafic bodies in the oceanic crust.
An inverse relationship was found between temperature of serpentinization and boron content of the serpentinites, suggesting that boron is acquired by the serpentinites from seawater at low temperature.

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