Water partitioning between mantle minerals from peridotite xenoliths

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doi: 10.1007/s00410-006-0177-1
Authors:Grant, Kevin; Ingrin, Jannick; Lorand, Jean Pierre; Dumas, Paul
Author Affiliations:Primary:
Macquarie University, Department of Earth and Planetary Sciences, Sydney, N.S.W., Australia
Other:
Université de Toulouse, France
Muséum National d'Histoire Naturelle, France
Synchrotron SOLEIL, France
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 154(1), p.15-34. Publisher: Springer International, Heidelberg - New York, International. ISSN: 0010-7999
Publication Date:2007
Note:In English. 83 refs.; illus., incl. 4 tables
Summary:The speciation and amount of water dissolved in the nominally anhydrous silicates of eight different mantle xenoliths has been quantified using synchrotron micro-FTIR spectroscopy. Samples studied are from six geographic localities and represent a cross-section of the major upper mantle lithologies from a variety of tectonic settings. Clinopyroxene contains between 342 and 413 ppm H2O. Orthopyroxene, olivine and garnet contain 169-201, 3-54 and 0 to <3 ppm H2O, respectively. Pyroxenes water contents and the distribution of water between orthopyroxene and clinopyroxene is identical regardless of sample mineralogy. The total water contents of each xenolith are similar at (113 ± 14 ppm H2O). High-resolution spectroscopic traverses show that the concentration and speciation of hydrous defects dissolved in each phase are spatially homogeneous within individual crystals and identical in different crystals interspersed throughout the xenolith. These results suggest that the amount of water dissolved in the silicate phases is in partial equilibrium with the transporting melt. Other features indicate that xenoliths have also preserved OH signatures of equilibrium with the mantle source region. Hydroxyl stretching modes in clinopyroxene show that garnet lherzolites re-equilibrated under more reducing conditions than spinel lherzolites. The distribution of water between pyroxenes and olivine differs according to xenolith mineralogy. [G.L.B.]
Sections:Geochemistry; Petrology
Subsections:Igneous rocks
Mineral Groups:Ortho-and ring silicates; Single-chain silicates
Subjects:Chemical composition; FTIR spectra; Garnet lherzolite; Geochemistry; Heat flow; Hydrogen; Igneous rocks; Inclusions; Infrared spectra; Kimberlite; Lithosphere; Major elements; Mantle; Mineral composition; Partition coefficients; Partitioning; Peridotites; Petrology; Plutonic rocks; Samples; Solutes; Spectra; Thermal conductivity; Ultramafics; Upper mantle; Viscosity; Water; Xenoliths; Africa; Central Massif; Europe; France; New Mexico; South Africa; Southern Africa; United States; Western Europe
Abstract Numbers:07M/2705
Record ID:2008040005
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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