Probabilistic Tomography Maps Chemical Heterogeneities Throughout the Lower Mantle-Reference-Cited by-同舟云学术

Probabilistic Tomography Maps Chemical Heterogeneities Throughout the Lower Mantle

Published:2004-10-29 Issue:5697 Volume:306 Page:853-856
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Trampert Jeannot¹²,Deschamps Frédéric¹²,Resovsky Joseph¹²,Yuen Dave¹²

Affiliation:

1. Department of Earth Sciences, Utrecht University, Post Office Box 80021, 3508 TA Utrecht, Netherlands.

2. Minnesota Supercomputer Institute, Department of Geophysics University of Minnesota, Minneapolis, MN 55455–0219, USA.

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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