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Geodynamics Series

 

Keywords

  • Core‐mantle boundary

Index Terms

  • 8121 Tectonophysics: Dynamics, convection currents and mantle plumes
  • 7207 Seismology: Core and mantle
  • 1510 Geomagnetism and Paleomagnetism: Dynamo theories
  • 3924 Mineral Physics: High-pressure behavior

The Core‐Mantle Boundary Region

Vol. 28, 1998

GEODYNAMICS SERIES, VOL. 28, 334 PP., 1998
ISSN: 0277-6669; ISBN: 0-87590-530-7

The Core‐Mantle Boundary Region

M. Gurnis, M. E. Wysession, E. Knittle, and B. A. Buffett (Eds.)

The core‐mantle boundary (CMB) is the largest density interface within the Earth's interior, and the change in material properties is as significant as that between the solid Earth and the hydrosphere. The two giant heat engines responsible for plate tectonics and the geodynamo dynamically interact at this boundary. The CMB is as dynamic as the Earth's outer skin, and seismological observations show that dense mantle dregs, anti‐continents, raft around the mantle's base and are underlain by giant molten oceans. The mantle dregs are sheared and have developed strong seismic anisotropy. The CMB dynamically interacts with the planet's surface; old oceanic lithosphere has been imaged down to the mantle's base where it accumulates. Reversal pathways of the geomagnetic field may be controlled by molten oceans at the CMB. The molten oceans the seismological ultra low velocity zone—may be the source of hot‐spot volcanism at the Earth's surface. The complex magnetohydrodynamics of the geodynamo within the fluid outer core of the Earth has been simulated on a computer, and the models show a surprising similarity to the observed geomagnetic field, including the observed westward drift and episodes of flux expulsion.

Citation: Gurnis, M., M. E. Wysession, E. Knittle, and B. A. Buffett (Eds.) (1998), The Core‐Mantle Boundary Region, Geodyn. Ser., vol. 28, 334 pp., AGU, Washington, D. C., doi:10.1029/GD028.

Gurnis, Michael; Wysession, Michael E.; Knittle, Elise; Buffett, Bruce A.

Preface

pp. vii-vii

[Abstract] | [Chapter] | [Full Text (PDF)]

Gurnis, Michael; Wysession, Michael E.; Knittle, Elise; Buffett, Bruce A.

Introduction

pp. 1-3

[Abstract] | [Chapter] | [Full Text (PDF)]

van der Hilst, Rob D.; Widiyantoro, Sri; Creager, Kenneth C.; McSweeney, Thomas J.

Deep subduction and aspherical variations in P-wavespeed at the base of Earth's mantle

pp. 5-20

[Abstract] | [Chapter] | [Full Text (PDF)]

Liu, Xian-Feng; Dziewonski, Adam M.

Global analysis of shear wave velocity anomalies in the lower-most mantle

pp. 21-36

[Abstract] | [Chapter] | [Full Text (PDF)]

Shearer, Peter M.; Hedlin, Michael A. H.; Earle, Paul S.

PKP and PKKP precursor observations: Implications for the small-scale structure of the deep mantle and core

pp. 37-55

[Abstract] | [Chapter] | [Full Text (PDF)]

Valenzuela, Raul W.; Wysession, Michael E.

Illuminating the base of the mantle with diffracted waves

pp. 57-71

[Abstract] | [Chapter] | [Full Text (PDF)]

Williams, Quentin

The temperature contrast across D″

pp. 73-81

[Abstract] | [Chapter] | [Full Text (PDF)]

Stixrude, Lars

Elastic constants and anisotropy of MgSiO3 perovskite, periclase, and SiO2 at high pressure

pp. 83-96

[Abstract] | [Chapter] | [Full Text (PDF)]

Kendall, J-M.; Silver, P. G.

Investigating causes of D″ anistropy

pp. 97-118

[Abstract] | [Chapter] | [Full Text (PDF)]

Knittle, Elise

The solid/liquid partitioning of major and radiogenic elements at lower mantle pressures: Implications for the core-mantle boundary region

pp. 119-130

[Abstract] | [Chapter] | [Full Text (PDF)]

Poirier, J. P; Malavergne, V.; Le Mouël, J. L.

Is there a thin electrically conducting layer at the base of the mantle?

pp. 131-137

[Abstract] | [Chapter] | [Full Text (PDF)]

Holme, Richard

Electromagnetic core-mantle coupling II: Probing deep mantle conductance

pp. 139-151

[Abstract] | [Chapter] | [Full Text (PDF)]

Buffett, Bruce A.

Free oscillations in the length of day: Inferences on physical properties near the core-mantle boundary

pp. 153-165

[Abstract] | [Chapter] | [Full Text (PDF)]

Gubbins, David

Interpreting the paleomagnetic field

pp. 167-182

[Abstract] | [Chapter] | [Full Text (PDF)]

Zatman, Stephen; Bloxham, Jeremy

A one-dimensional map of BS from torsional oscillations of the Earth's core

pp. 183-196

[Abstract] | [Chapter] | [Full Text (PDF)]

Kuang, Weijia; Bloxham, Jeremy

Numerical dynamo modeling: Comparison with the Earth's magnetic field

pp. 197-208

[Abstract] | [Chapter] | [Full Text (PDF)]

Sidorin, I.; Gurnis, Michael

Geodynamically consistent seismic velocity predictions at the base of the mantle

pp. 209-230

[Abstract] | [Chapter] | [Full Text (PDF)]

Tackley, Paul J.

Three-dimensional simulations of mantle convection with a thermo-chemical basal boundary layer: D″?

pp. 231-253

[Abstract] | [Chapter] | [Full Text (PDF)]

Anderson, Don L.

The EDGES of the mantle

pp. 255-271

[Abstract] | [Chapter] | [Full Text (PDF)]

Wysession, Michael E.; Lay, Thorne; Revenaugh, Justin; Williams, Quentin; Garnero, Edward J.; Jeanloz, Raymond; Kellogg, Louise H.

The D″ discontinuity and its implications

pp. 273-297

[Abstract] | [Chapter] | [Full Text (PDF)]

Lay, Thorne; Williams, Quentin; Garnero, Edward J.; Kellogg, Louise; Wysession, Michael E.

Seismic wave anisotropy in the D″ region and its implications

pp. 299-318

[Abstract] | [Chapter] | [Full Text (PDF)]

Garnero, Edward J.; Revenaugh, Justin; Williams, Quentin; Lay, Thorne; Kellogg, Louise H.

Ultralow velocity zone at the core-mantle boundary

pp. 319-334

[Abstract] | [Chapter] | [Full Text (PDF)]

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