Related Experiment Video
Updated: Jun 27, 2026
06:29
Simulation of Early Earth Hydrothermal Chimneys in a Thermal Gradient Environment
Published on: February 27, 2021
Impact heating and the hidden Hadean
Tim E Johnson1, Craig O'Neill2, Simon Turner3
1Curtin Frontier Institute for Geoscience Solutions (CFIGS), School of Earth and Planetary Sciences, Curtin University, Perth, WA, Australia.
Science (New York, N.Y.)
|June 25, 2026
Summary
Early Earth
Area of Science:
- Geology
- Planetary Science
- Geophysics
Background:
- The composition and state of Earth's Hadean eon crust (≥4.03 billion years ago) remain poorly understood.
- Previous geodynamic models primarily focused on internal heat sources, neglecting the significant Hadean impact flux.
Purpose of the Study:
- To investigate the influence of Hadean impact heat flux on early Earth's crustal evolution.
- To determine the role of impacts in shaping the initial composition and structure of Earth's crust.
Main Methods:
- Utilized a stochastic model to simulate the Hadean impact flux.
- Integrated impact-generated heat into geodynamic models of early Earth.
Main Results:
- Time-integrated heat from impacts significantly exceeded internal heat production during the Hadean.
- Extensive melting of the Hadean crust occurred below a few kilometers depth.
- Impacts drove gravitational segregation, leading to silica-rich crustal compositions.
- Impact heating diminished significantly after 3.9 billion years ago, enabling crustal thickening.
Conclusions:
- Hadean impact events were a dominant factor in early crustal evolution, leading to molten conditions and compositional changes.
- The decline in impact activity post-3.9 billion years ago likely facilitated the formation of enduring continental crust.
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