Precursor and metamorphic condition effects on Raman spectra of poorly ordered carbonaceous matter in chondrites and coals

The relationship between micro-Raman spectral parameters and reflectance of solid bitumen

“…Previous studies have also discussed the influence of factors except maturity on the Raman spectral parameters of solid organic matter, including their precursors (Quirico et al, 2009), fluids (Guedes et al, 2005), measurement conditions (laser wavelength, excitation time), sample preparation (powder sample or polished thin section sample), and models and procedures for curve fitting (Beyssac et al, 2003;Quirico et al, 2005). These factors affect the magnitude of Raman spectral parameters of solid organic matter, accounting for poor agreement among results from different authors.…”

“…In recent decades, numerous papers have reported that the Raman spectral characteristics and related parameters of geological solid organic matter, including coals, carboniferous fossils and carbonaceous materials, can be used as indicators for thermal maturity (i.e., Beyssac et al, 2002;Ferrari and Robertson, 2000;Guedes et al, 2010;Kelemen and Fang, 2001;Kwiecinska et al, 2010;Muirhead et al, 2012;Quirico et al, 2005Quirico et al, , 2009Rahl et al, 2005;Roberts et al, 1995;Schopf et al, 2005;Schopf and Kudryavtsev, 2009;Zeng and Wu, 2007). Detailed studies have focused on coals with different rank (Green et al, 1983;Guedes et al, 2010;Kelemen and Fang, 2001;Marques et al, 2009;Quirico et al, 2005;Sonibare et al, 2010).…”

Organic and volatile elements in the solar system

“…This likely reflects that some differences observed may be related to the organic matter accreted before parent body evolution. As shown by Raman spectrometry on low grade meteorites [91], organic macromolecules accreted on each class of parent body were broadly similar, but there is no common precursor to all the parent bodies. This is consistent with some isotopic observations described in section 4.2.…”

Lichen preservation in amber: morphology, ultrastructure, chemofossils, and taphonomic alteration

“…The most prominent signals in all spectra are typical for amorphous carbon, characterized by two main bands: the graphite (G) band around 1600 cm −1 and the disordered (D) band around 1350 cm −1 (e.g. Tuinstra and Koenig, 1970;Wopenka and Pasteris, 1993;Quirico et al, 2009). The average position of the G bands measured from the cortex was 1573 cm −1 and from the medulla 1584 cm −1 , and the average position of the D bands from the cortex 1373 cm −1 and from the medulla 1388 cm −1 (Table 1, Fig.…”