Mechanism of Late Campanian–Early Maastrichtian oil shale deposition and its sequence stratigraphy implications inferred from the palynological and geochemical analysis

Organic Petrographic and Geochemical Evaluation of the Black Shale of the Duwi Formation, El Sebaiya, Nile Valley, Egypt

“…These particles have spherical lobes that could be relicts of algal cells (Figure 11 (8)(9)(10). Sheet-like particles lacking fluorescence but having cellular structure occurred in relatively large abundance (34%) (Figure 11 (4,5) and Figure 12 (13)). The sheets were observed in the kerogen extracts (Figure 12 (2)).…”

“…The sheets were observed in the kerogen extracts (Figure 12 (2)). Bituminite (9%) also occurred in significant amounts and was concentrated especially around alginite fragments (Figure 11 (4,5,10)). It showed light brown color in white light and yellow color in fluorescence mode.…”

“…The kerogen type is mixed II/III, which is also in accordance with the organic geochemical analysis (Table 5). cence color (Figure 12 (3)(4)(5)(6)). The examination of kerogen extract in t showed the dominance of flaky AOM and dinoflagellates (Figure 12 (1 conditions ranged from dysoxic to suboxic [67].…”

“…In Egypt, the above time interval is economically important as it contains the main episodes that led to the formation of the black shale and phosphorites of the Duwi Formation [4]. Phosphatic accumulations are associated with organic-rich strata and cherts, and indicate high productive surface waters [1,4].…”

“…In Egypt, the above time interval is economically important as it contains the main episodes that led to the formation of the black shale and phosphorites of the Duwi Formation [4]. Phosphatic accumulations are associated with organic-rich strata and cherts, and indicate high productive surface waters [1,4]. The province holds the greatest accumulation of phosphorites in geological history, possibly in excess of 70 billion metric tons; the phosphate resources in Egypt alone exceed 3 billion metric tons [5].…”