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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

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Published on: November 16, 2013

A diffusion mechanism for core-mantle interaction.

Leslie A Hayden1, E Bruce Watson

  • 1Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, New York 12180, USA. haydel@rpi.edu

Nature
|November 30, 2007
PubMed
Summary
This summary is machine-generated.

Siderophile elements, crucial for understanding Earth's differentiation, can travel through grain boundaries in the mantle. This research shows grain-boundary diffusion is a viable mechanism for core-mantle chemical exchange.

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Atom Probe Tomography Analysis of Exsolved Mineral Phases
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Related Experiment Videos

Last Updated: May 13, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 16, 2013

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
11:50

Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

Published on: June 13, 2015

Atom Probe Tomography Analysis of Exsolved Mineral Phases
08:14

Atom Probe Tomography Analysis of Exsolved Mineral Phases

Published on: October 25, 2019

Area of Science:

  • Geochemistry
  • Mineral Physics
  • Planetary Science

Background:

  • Siderophile elements are concentrated in Earth's core but are more abundant in the upper mantle than predicted by core-formation models.
  • Re-mixing of outer-core material into the mantle via metal-silicate interactions in the D'' layer has been proposed to explain these concentrations.
  • The mobility of siderophile elements along grain boundaries, analogous to oxygen and lithophile elements, is uncertain.

Purpose of the Study:

  • To investigate the potential for grain-boundary diffusion of siderophile elements through polycrystalline MgO.
  • To determine if grain-boundary diffusion can facilitate significant chemical transport between the core and mantle over geological timescales.

Main Methods:

  • Experimental study of grain-boundary diffusion of siderophile elements in polycrystalline MgO.
  • Quantification of alloy formation between metal sources and sinks separated by MgO.

Main Results:

  • Significant alloying observed, indicating substantial grain-boundary diffusion of siderophile elements.
  • Calculated diffusivities suggest transport over geologically relevant distances (tens of kilometers) within Earth's age.
  • Grain-boundary diffusion is confirmed as a potentially rapid transport pathway.

Conclusions:

  • Grain-boundary diffusion of siderophile elements is an effective process in the mantle.
  • This mechanism provides a viable pathway for chemical exchange between the Earth's core and mantle.
  • The findings support models involving core-mantle interaction in planetary chemical evolution.