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
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dc.contributor.author | Bailey E. | |
dc.contributor.author | Holloway J.R. | |
dc.date.accessioned | 2021-01-25T02:40:07Z | |
dc.date.available | 2021-01-25T02:40:07Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=519114 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2000, 183, 3, 487-498 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23717 | |
dc.description.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. | |
dc.subject | TALC | |
dc.subject | ELASTIC PROPERTIES | |
dc.subject | SUBDUCTION ZONES | |
dc.subject | PERIDOTITES | |
dc.subject | MANTLE | |
dc.subject | ULTRASONIC METHODS | |
dc.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 | |
dc.type | Статья |
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