Kerogen isolated from core samples

Table III. EPR Parameters of Kerogens Isolated from Core Samples in Proximity of Dibase Sill, Site 368, Leg 41...

Table II Carbon, sulfur, nitrogen and iron elemental data of kerogens (containing pyrite) isolated from Nflrdlinger Ries core samples. H/C, N/C and SQrg/Corg are atomic ratios.

Ishiwatari, R. (1977). Organic geochemistry of a 200-meter core sample from Lake Biwa. III. Isolation and characterization of kerogen and humic acid. Proc. Japan Acad. 53, Ser. B, 47-50. 

Figure 5a and Table la contain data for a set of samples taken from a 1500 m thick section of the Monterey shales. The kerogens were isolated (HCl, HCl/HF removal of carbonates and silicates and dilute nitric acid to remove the pyrite) for some of the core samples, but the total rock was used for the Rock Eval T ax determination to estimate maturation levels. The was measured for the extracted bitumen of each sample. The increase in T ax with depth is correlated with maturation indicating that burial of the samples increased their maturation. Two trends are indicated by the values one starts at +15.6 and increases to +17.7%o, and the second from +19.0 to +21.3%o. The data indicate that the bitumen produced at higher level of maturation is enriched with the heavier isotope. The elemental analysis of the bitumen shows that the shallowest (1400 m) sample has —11% S, whereas the deepest at 2490 m... 

The samples were obtained from the working cores of the DSDP repository. The samples were freeze-dried, powdered in a glass mortar and pestle, composited, heated, and treated in the same manner for extraction, kerogen isolation, thin-layer chromatography (TLC) of the extracts, and analysis by gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) as reported earlier (Simoneit et al, 1981 Fig. 1). 

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