Hydrogarnet substitution in pyrope: a possible location for ``water'' in the mantle

Details Hydrogarnet substitution in pyrope: a possible location for ``water'' in the mantle Hydrogarnet substitution in pyrope: a possible location for ``water'' in the mantle

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..208a&link_type=abstract

Earth and Planetary Science Letters, Volume 62, Issue 2, p. 208-214.

Computer Science

19

Scientific paper

Single-crystal spectra of pyropes, synthesized on the 3:1:3 composition of the system MgO-Al2O3-SiO2 at pH2O = ptotal = 25 kbar and 1000°C, show a broad band centered at around 3400 cm-1 due to νH2O of (H2O)n aggregates in fluid inclusions and a sharp intense band near 3600 cm-1 due to νOH of (HO)44- clusters introduced by the hydrogarnet substitution Si4+ = 4 H+. The water contents in the synthetic pyrope, due to (HO)44- clusters are estimated near 0.05 wt.% H2O from spectroscopic data. Si deficits in microprobe analyses of the pyropes studied support the hydrogarnet substitution. These results show that the hydrogarnet substitution in pyrope may contribute to water contents in the mantle.

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