Experimental study of the influence of water on elastic wave velocities in dunite and serpentinite (on the nature of the low-velocity zone in the upper mantle of the Earth) |
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Authors: | E B Lebedev N I Pavlenkova O A Lukanin |
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Institution: | 1.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia;2.Schmidt Joint Institute of Physics of the Earth,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Longitudinal wave velocities (V P ) in rocks were measured experimentally in dunite (olivinite) and serpentinite at a water pressure of 300 MPa and temperatures of 20–850°C. It is shown that the strong decrease in V P in dunite (by ~3 km/s) observed within the range of 400–800°C results from penetration of water into rock along microfractures and from the formation of hydrous minerals (mostly serpentine) along the boundaries of mineral grains as a result of water–olivine interaction. It is suggested that serpentinization or the formation of similar hydrous minerals in olivine-rich mantle rocks under the influence of deep fluids may result in the formation of zones of low-velocity elastic waves in the upper mantle at great depths (~100 km). |
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