Figure 8. Relationship between Rock-Eval hydrogen index and Tmax values in Pliocene-Pleistocene sediments from Site 977 in the Eastern Alboran Basin. Thermal alteration pathways of organic matter Types I, II, and III are indicated by solid lines. Dashed lines indicate approximate vitrinite reflectance values (not measured) that define the "oil window." Organic matter in Pleistocene sediments is immature with respect to petroleum generation, whereas it is overmature in Pliocene sediments.

Figure 8. Relationship between Rock-Eval hydrogen index and T_max values in Pliocene-Pleistocene sediments from Site 977 in the Eastern Alboran Basin. Thermal alteration pathways of organic matter Types I, II, and III are indicated by solid lines. Dashed lines indicate approximate vitrinite reflectance values (not measured) that define the "oil window." Organic matter in Pleistocene sediments is immature with respect to petroleum generation, whereas it is overmature in Pliocene sediments.