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- W1996543507 abstract "We have measured compressional wave velocity (VP) in talc as a function of temperature at 0.5 GPa. VP falls from 5.27±0.23 km s−1 at 25°C to 4.35±0.15 km s−1 at 800°C. Combining these results with a previously published bulk modulus (K) and δK/δP, gives a Poisson’s ratio (ν) of 0.268 and a shear modulus (G) of 22.6 GPa under atmospheric conditions. Assuming that ν is independent of temperature gives a δK/δT value of −19.3±0.64 MPa K−1 at 0.5 GPa. We used the experimental data, in combination with published data, to calculate bounds on the elastic moduli of a peridotite hydrated with talc just above cold subducting lithosphere. We find that an assemblage hydrated by only 0.9 wt% H2O has elastic wave velocities (calculated from the Voigt–Reuss–Hill average) lower than the anhydrous rock by an average of 7.6% for VP, and 9.7% for shear waves (Vs) at 700°C. These results are consistent with observations of converted phase behavior in the vicinity of the surface of a cold subducting slab, and may place the low-velocity layer observed in the lowermost mantle wedge, not the uppermost slab as has previously been suggested." @default.
- W1996543507 created "2016-06-24" @default.
- W1996543507 creator A5009568820 @default.
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- W1996543507 date "2000-12-01" @default.
- W1996543507 modified "2023-10-16" @default.
- W1996543507 title "Experimental determination of elastic properties of talc to 800°C, 0.5 GPa; calculations of the effect on hydrated peridotite, and implications for cold subduction zones" @default.
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- W1996543507 doi "https://doi.org/10.1016/s0012-821x(00)00288-0" @default.
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