Figure 4 | Scientific Reports

Figure 4

From: Direct Rubidium-Strontium Dating of Hydrocarbon Charge Using Small Authigenic Illitic Clay Aliquots from the Silurian Bituminous Sandstone in the Tarim Basin, NW China

Figure 4

Representative scanning electron microscope (SEM) images of illitic clays in the Silurian bituminous sandstone13. (A) Flaky ordered I/S particles in YM35-1. I/S particles contain small proportions of expandable smectite layers (interstratified ratio (IR) = 5%); (B) Flaky and filamentous ordered I/S particles in H6. I/S particles contain high proportions of expandable smectite layers (IR = 20%). (C) Honeycomb I/S and filamentous illites (I) in TZ67. I/S particles contain high proportions of expandable smectite layers (IR = 30%); (D) Honeycomb ordered I/S particles in TZ67. I/S particles contain high proportions of expandable smectite layers (IR = 30%).

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