Fumarolic-like activity on carbonaceous chondrite parent body.

Area of Science:

• Comparative planetology
• Planetary science
• Geochemistry

Background:

• Comparative planetology is crucial for understanding planetary formation and evolution.
• Pristine asteroids are difficult to study due to collisional comminution over billions of years.

Purpose of the Study:

• To identify a terrestrial analog for metasomatic processes on asteroid parent bodies.
• To understand the formation of secondary silicates in carbonaceous chondrites.

Main Methods:

• Analysis of textural, mineralogical, chemical, and thermodynamic similarities.
• Comparison between Kudryavy volcano fumarolic environment and CV/CO carbonaceous chondrites.

Main Results:

• The Kudryavy volcano's high-temperature fumarolic environment is a likely proxy for Fe-alkali-halogen metasomatism on CV and CO chondrite parent bodies.
• Secondary silicates in CV and CO chondrites are inferred to be fumarolic-like incrustations.
• These incrustations precipitated from hydrothermal vapors interacting with wallrocks.

Conclusions:

• Terrestrial volcanic environments can serve as analogs for understanding early solar system processes.
• Hydrothermal vapor interactions are key to the formation of secondary minerals in carbonaceous chondrites.
• The origin of these vapors is linked to devolatilization of chondritic material or cooling nebular gases.