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Polycyclic aromatics in the Chang'E 5 lunar soils.
Guangcai Zhong1, Xin Yi1, Shutao Gao1
1State Key Laboratory of Advanced Environmental Technology (SKLAET), Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China.
Nature Communications
|April 16, 2025
Summary
Researchers found significant amounts of polycyclic aromatic compounds in lunar soil from the Chang
Area of Science:
- Astrogeology
- Organic Geochemistry
- Planetary Science
Background:
- Polycyclic aromatic compounds (PACs) are common in space but difficult to find on the Moon.
- Previous studies have not extensively analyzed PACs in lunar samples.
Purpose of the Study:
- To investigate the presence, concentration, and characteristics of PACs in lunar soil.
- To determine the origin and formation mechanisms of lunar PACs.
Main Methods:
- Analysis of Chang'E-5 lunar soil samples.
- Measurement of PAC concentrations and structural properties.
- Stable carbon isotope analysis (δ13C) of PACs.
Main Results:
- PAC concentrations in Chang'E-5 soil range from 5.0-9.2 µg/g (average 7.4 ± 1.4 µg/g).
- Lunar PACs exhibit highly condensed aromatic structures, distinct from terrestrial sources.
- Lunar PACs show 13C enrichment compared to meteorites, suggesting a de novo formation process.
Conclusions:
- Meteorite impacts are likely sources of lunar PACs.
- A de novo formation mechanism converts non-aromatic organic matter into PACs during impacts.
- PACs contribute to stable carbon accretion in lunar regolith due to their resistance to degradation.
