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Mineral Surface Rearrangement at High Temperatures: Implications for Extraterrestrial Mineral Grain Reactivity
Helen E King1,2,3, Oliver Plümper4, Christine V Putnis1,5
1Institut für Mineralogie, University of Münster, Corrensstrasse 24, 48149 Münster, Germany.
Mineral surfaces, like olivine, rearrange rapidly during thermal fluctuations below melting point. This creates new reactive sites crucial for early solar system chemistry and planetary formation.
Area of Science:
- Geochemistry
- Planetary Science
- Materials Science
Background:
- Mineral surfaces are vital in the early solar system for catalysis and water adsorption.
- The response of minerals to sub-melting temperature fluctuations remains poorly understood.
Purpose of the Study:
- To investigate the surface behavior of minerals under rapid, sub-melting thermal fluctuations.
- To understand the implications for chemical reactions and water availability in the early solar nebula.
Main Methods:
- Polished olivine ((Mg,Fe)2SiO4) surfaces were subjected to rapid heating below melting point.
- Surface reorganization textures were analyzed using high-resolution microscopy.
Main Results:
- Olivine surfaces exhibited significant reorganization within minutes at 1200 °C.
- Newly formed surface features reached up to 40 nm in height.
Conclusions:
- Sub-melting thermal fluctuations create highly reactive sites on nebula mineral particles.
- These findings may explain diffusion profile discrepancies in experimental studies.
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