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Crustal evolution and mantle dynamics through Earth history.

Jun Korenaga1

  • 1Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA jun.korenaga@yale.edu.

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Understanding early Earth dynamics requires studying continental crust evolution. Plate tectonics

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Area of Science:

  • Geophysics
  • Geochemistry
  • Earth Sciences

Background:

  • Plate tectonics significantly influences Earth's geological processes, but its initiation and early dynamics remain debated.
  • Earth's surface is continuously recycled by plate tectonics, destroying direct evidence of early geological activity.
  • Continental crust, surviving over billions of years, offers indirect evidence for reconstructing past Earth dynamics.

Purpose of the Study:

  • To review and categorize existing models of continental growth.
  • To explore the theoretical basis for changes in Precambrian mantle convection.
  • To propose a hypothesis for the evolution of mantle dynamics and its link to surface environment, including continental crust formation and preservation.

Main Methods:

  • In-depth review of continental growth models (crust-based, mantle-based).
  • Theoretical review of Precambrian mantle convection changes and early Earth dynamics.
  • Integration of geological, geochemical, and geodynamical data to formulate a hypothesis.

Main Results:

  • Continental growth models highlight the role of crustal recycling and subduction.
  • A hypothesis suggests early plate tectonics and gradual mantle hydration facilitated continental crust formation, preservation, and emergence.
  • Current understanding of material properties limits quantitative modeling of early Earth processes.

Conclusions:

  • The early onset of plate tectonics and mantle hydration are key to understanding continental crust evolution.
  • Future quantitative modeling could address preservation bias in early Earth research.
  • This research contributes to understanding Earth dynamics and the development of plate tectonics.