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Raman Spectroscopy as a Tool to Measure Silanol as Evidence of Water-Rock Interactions for Astrobiological
Yasumoto Tsukada1,2, Stephen A Bowden1
1School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom of Great Britain and Northern Ireland.
Astrobiology
|April 15, 2025
Summary
Raman spectroscopy detected silanol (Si-OH) in most quartz samples, indicating past water presence. This method may also detect carbonaceous materials, suggesting potential habitability and life indicators.
Area of Science:
- Geochemistry and Astrobiology
- Mineralogy and Spectroscopy
Background:
- Silica minerals are crucial for astrobiological exploration due to their precipitation from water.
- Opaline minerals with intracrystalline water are known indicators of past water, but other silica phases also hold evidence.
- Water can be incorporated into crystalline quartz as silanol (Si-OH) hydroxyl groups within the crystal lattice.
Purpose of the Study:
- To investigate the presence and distribution of silanol in various quartz samples using Raman spectroscopy.
- To assess the potential of Raman spectroscopy for detecting both water and carbonaceous materials as indicators of habitability.
Main Methods:
- Analysis of Raman spectra from diverse silica gemstones and rocks.
- Quantification of silanol presence using the Silprop parameter.
- Detection of co-occurring silanol and carbonaceous materials.
Main Results:
- Silanol was detected in 52 out of 71 analyzed quartz samples.
- Microcrystalline quartz and pseudomorphic silica samples showed higher silanol levels compared to macrocrystalline quartz.
- Co-detection of quartz-hosted silanol and carbonaceous materials was observed.
Conclusions:
- Silanol is a common structural defect in quartz, serving as an indicator of past water-rock interaction.
- Raman spectroscopy is effective for identifying silanol in quartz and has potential for detecting biosignatures.
- The co-detection of silanol and carbonaceous matter highlights Raman's utility in assessing past habitability and potential life.
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