A study of amber and copal samples using FT-Raman spectroscopy.

Area of Science:

• Geochemistry
• Organic geochemistry
• Paleontology

Background:

• Fossil resins provide insights into ancient ecosystems and chemical processes.
• Characterizing fossil resins aids in understanding their origin and diagenesis.
• Fourier Transform Raman (FT-Raman) spectroscopy is a valuable tool for analyzing organic materials.

Purpose of the Study:

• To analyze the chemical composition of fossil resins from diverse geographical locations using FT-Raman spectroscopy.
• To investigate the relationship between spectral profiles, geographical origin, and chemical composition (diterpenoid vs. triterpenoid).
• To determine if FT-Raman spectra can distinguish the source or maturation level of fossil resins.

Main Methods:

• Collection of FT-Raman spectra from fossil resin samples of various origins.
• Comparison of spectral profiles to identify characteristic chemical components (diterpenoids, triterpenoids).
• Correlation of spectral data with geographical origin and inferred maturation levels.

Main Results:

• Most fossil resins exhibited spectral profiles consistent with modern resins containing diterpenoid components, primarily labdane skeletons.
• A fossil resin sample from Borneo showed a distinct spectral profile, indicating the presence of triterpenoid components.
• Differences in spectral profiles among diterpenoid-containing fossil resins were attributed to varying maturation levels, not geographical origin.

Conclusions:

• FT-Raman spectroscopy can differentiate fossil resins based on their chemical composition (diterpenoid vs. triterpenoid).
• The maturation level is a key factor influencing the spectral characteristics of diterpenoid fossil resins.
• While source cannot be definitively identified, maturation data can help narrow down potential geographical origins.