Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..78..177k&link_type=abstract
Earth and Planetary Science Letters, Volume 78, Issue 2-3, p. 177-188.
Physics
5
Scientific paper
Ultramafic rocks from the Islas Orcadas and Shaka Fracture Zones have been progressively hydrated, starting at temperatures greater than 700°C and continuing to less than 250°C. The hydration is manifest as a sequence of alteration minerals, including (in order of decreasing temperature) amphibole, talc, talc plus secondary olivine, chlorite, secondary clinopyroxene, prehnite and serpentine. Early, high-temperature minerals display lower 87Sr/86Sr ratios and higher K, Rb and Sr than later, lower-temperature minerals. One explanation for the change in 87Sr/86Sr ratios is that early, high-temperature reactions are the result of hydration by fluids characterized by a relatively strong basaltic geochemical signature, and the later, lower-temperature alteration is the result of hydration by fluids characterized by a relatively weaker basaltic signature and relatively stronger seawater signature.
Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, England.
Gerlach David C.
Kimball K. L.
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