Volatile-rich mantle fluids inferred from inclusions in diamond and mantle xenoliths

Details Volatile-rich mantle fluids inferred from inclusions in diamond and mantle xenoliths Volatile-rich mantle fluids inferred from inclusions in diamond and mantle xenoliths

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.344..653t&link_type=abstract

Nature (ISSN 0028-0836), vol. 344, April 12, 1990, p. 653-655.

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8

Diamonds, Earth Mantle, Hydrothermal Systems, Petrology, Argon Isotopes, Basalt, Inclusions, Radioactive Age Determination

Scientific paper

(Ar-40)-(Ar-39) measurements on coats and cores of 'coated stones' and on fluid inclusions in olivine from an East African mantle xenolith with midocean-ridge basalt affinities are described. The results prove conclusively that Ar-40 in the coats of the diamonds and in the mantle xenolith is present in a widespread chlorine-rich component. These data imply the existence of H2O/CO2-rich phases with Ar-40/Cl ratios which are remarkably uniform over large distances, and which show enrichments of these two incompatible elements by almost four orders of magnitude relative to bulk upper-mantle values. These extreme enrichments imply that the fluid phase must be present at no more than one or two parts in 10,000 in the region from which the argon and chlorine are extracted.

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