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Thiophenes on Mars: Biotic or Abiotic Origin?
Jacob Heinz1, Dirk Schulze-Makuch1,2,3,4
1Center for Astronomy and Astrophysics (ZAA), Astrobiology Research Group, Technische Universität Berlin, Berlin, Germany.
Astrobiology
|February 25, 2020
Summary
Organic compounds, including thiophenes, have been discovered on Mars, suggesting indigenous presence. Their origin could be biological or abiotic, requiring further investigation for biomarker potential.
Area of Science:
- Astrobiology
- Geochemistry
- Planetary Science
Background:
- Organic compounds on Mars have been a long-standing question.
- The Curiosity rover detected various organic matter classes in Martian sediments.
- Thiophenes, organic compounds found on Earth in geological and biological contexts, were identified.
Purpose of the Study:
- To explore potential biotic and abiotic pathways for thiophene generation and degradation on Mars.
- To discuss the significance of thiophenes as potential Martian biomarkers.
- To investigate correlations between thiophene abundance and sulfate-bearing minerals.
Main Methods:
- Review of existing data on Martian organic compounds.
- Analysis of conceivable biotic and abiotic formation pathways for thiophenes.
- Discussion of biomarker potential and mineral correlations.
Main Results:
- Thiophenes found on Mars may originate from either biological or non-biological processes.
- Sulfur incorporation into organic matter during diagenesis is a plausible abiotic pathway.
- A potential correlation exists between thiophene and sulfate mineral abundances.
Conclusions:
- Martian thiophenes present a complex origin, potentially serving as biomarkers.
- Future research should focus on differentiating biotic from abiotic origins.
- Further in-situ and laboratory studies are crucial for understanding Martian organic chemistry.
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