Fig. 4
From: Nanoscale geochemical and geomechanical characterization of organic matter in shale
Compositional trends in the maturation of individual macerals. a Average localized infrared (IR) spectra from three or more different solid bitumen particles in untreated and artificially matured New Albany Shale samples, with solid bitumen reflectance (BRo) ranging from 0.25% to 1.17%. b Average localized IR spectra from different locations in 1–2 inertinite particles in samples with BRo of 0.25 and 0.90%. c Average localized IR spectra from different locations in 1–2 Tasmanites particles in samples with BRo of 0.25 and 0.65%. d Pseudo van Krevelen diagram, constructed by plotting the IR proxy for H/C and O/C atomic ratios of Tasmanites, solid bitumen, and inertinite at different maturities. Solid bitumen reflectance values are indicated adjacent to calculated IR ratios (T, Tasmanites; B, solid bitumen; and I, inertinite)
