Access the full text.
Sign up today, get DeepDyve free for 14 days.
B. Karki, J. Crain (1998)
First‐principles determination of elastic properties of CaSiO3 perovskite at lower mantle pressuresGeophysical Research Letters, 25
T. Irifune, A. Ringwood (1993)
Phase transformations in subducted oceanic crust and buoyancy relationships at depths of 600–800 km in the mantleEarth and Planetary Science Letters, 117
Yanbin Wang, D. Weidner, Jianzhong Zhang, Gabriel Gwanrnesia, R. Liebermann (1998)
Thermal equation of state of garnets along the pyrope-majorite joinPhysics of the Earth and Planetary Interiors, 105
J. Montagner, D. Anderson (1989)
Constrained reference mantle modelPhysics of the Earth and Planetary Interiors, 58
S. Shim, T. Duffy, G. Shen (2000)
The equation of state of CaSiO3 perovskite to 108 GPa at 300 KPhysics of the Earth and Planetary Interiors, 120
Bass (1995)
Elasticity of minerals, glasses, and melts
M. Chai, J. Brown, L. Slutsky (1997)
The elastic constants of a pyrope‐grossular‐almandine garnet to 20 GpaGeophysical Research Letters, 24
A. Kavner, S. Sinogeikin, R. Jeanloz, J. Bass (2000)
Equation of state and strength of natural majoriteJournal of Geophysical Research, 105
A. Yeganeh-Haeri, D. Weidner, E. Ito (1990)
Elastic properties of the pyrope‐majorite solid solution seriesGeophysical Research Letters, 17
S. Sinogeikin, T. Katsura, J. Bass (1998)
Sound velocities and elastic properties of Fe-bearing wadsleyite and ringwooditeJournal of Geophysical Research, 103
Jun Liu, Ganglin Chen, G. Gwanmesia, R. Liebermann (2000)
Elastic wave velocities of pyrope–majorite garnets (Py62Mj38 and Py50Mj50) to 9 GPaPhysics of the Earth and Planetary Interiors, 120
J. Simpson (1984)
A simple model of the 1982‐83 Californian "El Nino"Geophysical Research Letters, 11
H. Morishima, E. Ohtani, Takumi Kato, T. Kubo, A. Suzuki, T. Kikegawa, O. Shimomura (1999)
The high-pressure and temperature equation of state of a majorite solid solution in the system of Mg4Si4O12-Mg3Al2Si3O12Physics and Chemistry of Minerals, 27
R. Pacalo, D. Weidner (1997)
Elasticity of majorite, MgSiO3 tetragonal garnetPhysics of the Earth and Planetary Interiors, 99
T. Irifune, M. Isshiki (1998)
Iron partitioning in a pyrolite mantle and the nature of the 410-km seismic discontinuityNature, 392
Ș., L.
Seismic Velocities in Mantle Minerals and the Mineralogy of the Upper Mantle
J. Bass (1989)
Elasticity of grossular and spessartite garnets by Brillouin spectroscopyJournal of Geophysical Research, 94
P. Conrad, C. Zha, H. Mao, R. Hemley (1999)
The high-pressure, single-crystal elasticity of pyrope, grossular, and andraditeAmerican Mineralogist, 84
S. Rigden, G. Gwanmesia, R. Liebermann (1994)
Elastic wave velocities of a pyrope-majorite garnet to 3 GPaPhysics of the Earth and Planetary Interiors, 86
S. Sinogeikin, J. Bass (2000)
Single-crystal elasticity of pyrope and MgO to 20 GPa by Brillouin scattering in the diamond cellPhysics of the Earth and Planetary Interiors, 120
B. Kennett, E. Engdahl (1991)
Traveltimes for global earthquake location and phase identificationGeophysical Journal International, 105
J. Leger, A. Redon, C. Chateau (1990)
Compressions of synthetic pyrope, spessartine and uvarovite garnets up to 25 GPaPhysics and Chemistry of Minerals, 17
A. Dziewoński, D. Anderson (1981)
Preliminary reference earth modelPhysics of the Earth and Planetary Interiors, 25
Ganglin Chen, J. Cooke, G. Gwanmesia, R. Liebermann (1999)
Elastic wave velocities of Mg3Al2Si3O12-pyrope garnet to 10 GPaAmerican Mineralogist, 84
G. Gwanmesia, Ganglin Chen, R. Liebermann (1998)
Sound velocities in MgSiO3‐garnet to 8 GPaGeophysical Research Letters, 25
Takahashi (1987)
Mineralogy of mantle peridotite along a model geotherm up to 700 km depth
Yu Nishihara, E. Takahashi (2001)
Phase relation and physical properties of an Al-depleted komatiite to 23 GPaEarth and Planetary Science Letters, 190
J. Bass, D. Anderson (1984)
Composition of the upper mantle: Geophysical tests of two petrological modelsGeophysical Research Letters, 11
Sinelnikov (1998)
Elasticity of CaTiO3-CaSiO3 perovskitesPhys. Chem. Miner., 25
Li Zhang, H. Ahsbahs, A. Kutoglu, C. Geiger (1999)
Single-crystal hydrostatic compression of synthetic pyrope, almandine, spessartine, grossular and andradite garnets at high pressuresPhysics and Chemistry of Minerals, 27
Elasticity of tetragonal end - member majorite and solid solutions in the system Mg 4 Si 4 O 12 - Mg 3 Al 2 Si 3 O 12
University of Illinois at Urbana-Champaign, 245 NHB
G. Davies, A. Dziewoński (1975)
Homogeneity and Constitution of the Earth's Lower Mantle and Outer CorePhysics of the Earth and Planetary Interiors, 10
Kennett (1993)
Seismic structure and heterogeneity in the Upper MantleGeophysical Monograph, 76
High seismic velocity gradients in the transition zone have been attributed to large pressure derivatives of the elastic moduli of transition zone minerals, such as majorite‐garnet. Here we present Brillouin scattering measurements of the elasticity of polycrystalline Mg‐majorite (Mj100, Mg4Si4O12) and a Mj50Py50 majorite ‐ pyrope solid solution to pressures similar to those at the top of the transition zone (15.1(1) GPa and 12.8(1) GPa, respectively). The pressure derivatives of the adiabatic bulk (KS) and shear (μ) moduli of both Mj50Py50 and Mj100 are 4.2(3) and 1.4(2), respectively, and are equal to those of pyrope within the experimental uncertainties. We conclude that neither the adiabatic compression of majorite‐garnet nor any other likely transition zone phase is able to produce the high velocity gradients observed seismically. High velocity gradients are consistent with gradual transformations between minerals with very different elastic properties. The transformation of ∼25% or more of clinopyroxene into majorite above 520 km, and the formation of Ca silicate perovskite below 520 km could produce the observed seismic gradients.
Geophysical Research Letters – Wiley
Published: Jan 1, 2002
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.