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Probabilistic Tomography Maps Chemical Heterogeneities Throughout the Lower Mantle
Abstract
We obtained likelihoods in the lower mantle for long-wavelength models of bulk sound and shear wave speed, density, and boundary topography, compatible with gravity constraints, from normal mode splitting functions and surface wave data. Taking into account the large uncertainties in Earth's thermodynamic reference state and the published range of mineral physics data, we converted the tomographic likelihoods into probability density functions for temperature, perovskite, and iron variations. Temperature and composition can be separated, showing that chemical variations contribute to the overall buoyancy and are dominant in the lower 1000 kilometers of the mantle.
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Cited by
Maruyama, S., Santosh, M., & Zhao, D. (2007) · Gondwana Research · doi:10.1016/j.gr.2006.06.003 · Cited by 444
Continent-sized anomalous zones with low seismic velocity at the base of Earth's mantle
Garnero, E. J., McNamara, A. K., & Shim, S.-H. (2016) · Nature Geoscience · doi:10.1038/ngeo2733 · Cited by 434
The effect of bulk composition and temperature on mantle seismic structure
Xu, W., Lithgow-Bertelloni, C., Stixrude, L., & Ritsema, J. (2008) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2008.08.012 · Cited by 400
Simmons, N. A., Myers, S. C., Johannesson, G., & Matzel, E. (2012) · Journal of Geophysical Research: Solid Earth · doi:10.1029/2012jb009525 · Cited by 349
Steinberger, B., & Calderwood, A. R. (2006) · Geophysical Journal International · doi:10.1111/j.1365-246x.2006.03131.x · Cited by 323
Metadata
- Authors
- Trampert, J., Deschamps, F., Resovsky, J., & Yuen, D.
- Venue
- Science
- Published
- 2004-10-29
- Volume
- 306
- Issue
- 5697
- Pages
- 853-856
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2162052651
- Cited by
- 501
- References
- 0
- FWCI
- 25.41
- Type
- journal article
- Language
- en
- Open access
- closed
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