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Related Experiment Video

Updated: May 16, 2025

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

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Formation and composition of Earth's Hadean protocrust.

Simon Turner1, Bernard Wood2, Tim Johnson3

  • 1School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia. simon.turner@mq.edu.au.

Nature
|April 2, 2025
PubMed
Summary
This summary is machine-generated.

Early Earth

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Area of Science:

  • Geochemistry
  • Planetary Science
  • Early Earth Evolution

Background:

  • Terrestrial planets, including Earth, formed an early protocrust from a magma ocean.
  • The chemical composition of this early crust remains under-explored.
  • Magma ocean differentiation occurred after core formation, influencing protocrust composition.

Purpose of the Study:

  • To investigate the chemical composition of Earth's early protocrust.
  • To determine if the early protocrust possessed characteristics similar to modern continental crust.
  • To reassess models of early plate tectonics and continental crust formation.

Main Methods:

  • Analysis of experimental and chronological data related to magma ocean differentiation.
  • Modeling the chemical composition of a protocrust formed under specific early Earth conditions.
  • Comparison of modeled protocrust composition with current average continental crust.

Main Results:

  • A protocrust formed after core extraction would exhibit incompatible trace-element characteristics.
  • These characteristics closely resemble those of the current average continental crust.
  • The Hadean protocrust likely possessed a continental trace-element signature.

Conclusions:

  • The continental trace-element signature may be a primordial feature of Earth's crust.
  • Subduction may not be the sole mechanism for generating the continental trace-element signature.
  • This finding challenges existing models for the initiation of plate tectonics and continental evolution.