We report the values of R = d ln(Vs)/d ln(Vp) due to water as a function of pressure for Mg(2)SiO(4) olivine, wadsleyite, ringwoodite. The results show that ringwoodite has significantly lower R than olivine and wadsleyite; due to the reason that bulk modulus of ringwoodite is more sensitive to water than shear modulus. R of ringwoodite decreases with pressure while R of olivine and wadsleyite increases with pressure. R reported here was calculated using theoretical method derived equation of states. R due to temperature is also reported as a comparison of R due to water. The local value of R in the upper mantle and transition zone can discriminate between lateral variations of water content and temperature as the origin of lateral seismic variations. Published by Elsevier B.V.
Prospecting for water in the transition zone: d ln(Vs)/d ln(Vp) / Li, L; Weidner, Dj; Brodholt, Jp; Alfe, D. - In: PHYSICS OF THE EARTH AND PLANETARY INTERIORS. - ISSN 0031-9201. - 189:1-2(2011), pp. 117-120. [10.1016/j.pepi.2011.07.009]
Prospecting for water in the transition zone: d ln(Vs)/d ln(Vp)
Alfe D
2011
Abstract
We report the values of R = d ln(Vs)/d ln(Vp) due to water as a function of pressure for Mg(2)SiO(4) olivine, wadsleyite, ringwoodite. The results show that ringwoodite has significantly lower R than olivine and wadsleyite; due to the reason that bulk modulus of ringwoodite is more sensitive to water than shear modulus. R of ringwoodite decreases with pressure while R of olivine and wadsleyite increases with pressure. R reported here was calculated using theoretical method derived equation of states. R due to temperature is also reported as a comparison of R due to water. The local value of R in the upper mantle and transition zone can discriminate between lateral variations of water content and temperature as the origin of lateral seismic variations. Published by Elsevier B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
