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Surveys in Geophysics

, Volume 37, Issue 1, pp 149–189 | Cite as

On Earth’s Mantle Constitution and Structure from Joint Analysis of Geophysical and Laboratory-Based Data: An Example

  • Amir Khan
Article

Abstract

Determining Earth’s structure is a fundamental goal of Earth science, and geophysical methods play a prominent role in investigating Earth’s interior. Geochemical, cosmochemical, and petrological analyses of terrestrial samples and meteoritic material provide equally important insights. Complementary information comes from high-pressure mineral physics and chemistry, i.e., use of sophisticated experimental techniques and numerical methods that are capable of attaining or simulating physical properties at very high pressures and temperatures, thereby allowing recovered samples from Earth’s crust and mantle to be analyzed in the laboratory or simulated computationally at the conditions that prevail in Earth’s mantle and core. This is particularly important given that the vast bulk of Earth’s interior is geochemically unsampled. This paper describes a quantitative approach that combines data and results from mineral physics, petrological analyses of mantle minerals, and geophysical inverse calculations, in order to map geophysical data directly for mantle composition (major element chemistry and water content) and thermal state. We illustrate the methodology by inverting a set of long-period electromagnetic response functions beneath six geomagnetic stations that cover a range of geological settings for major element chemistry, water content, and thermal state of the mantle. The results indicate that interior structure and constitution of the mantle can be well-retrieved given a specific set of measurements describing (1) the conductivity of mantle minerals, (2) the partitioning behavior of water between major upper mantle and transition-zone minerals, and (3) the ability of nominally anhydrous minerals to store water in their crystal structures. Specifically, upper mantle water contents determined here bracket the ranges obtained from analyses of natural samples, whereas transition-zone water concentration is an order-of-magnitude greater than that of the upper mantle and appears to vary laterally underneath the investigated locations.

Keywords

Mantle structure Composition Temperature Water circulation Mantle melting Electrical conductivity  Phase equilibria Electromagnetic sounding Inversion 

Notes

Acknowledgments

I would like to extend my gratitude to Thomas Shankland for helpful comments throughout and for proofreading the final manuscript. Many thanks also to Ian Ferguson and three anonymous reviewers for critically reviewing the manuscript. Finally, I would like to acknowledge Nathalie Bolfan-Casanova, Konstantin Litasov, and Shun Karato for sharing their figures.

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© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Institute of GeophysicsETH ZürichZürichSwitzerland

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