By R. C. Selley
Following on from the 1st 2 books within the sequence, Sedimentary Basins of the area, which coated chinese language Sedimentary Basins (Volume 1) and South Pacific Sedimentary Basins (Volume 2), comes quantity three, on African Basins.Africa covers a bigger land quarter than the us, Europe, India and the ASEAN countries prepare. it's wealthy in common assets, together with oil, gasoline, coal and approximately each metalliferous mineral. but Africa continues to be one of many least explored continents.This e-book brings jointly in a single quantity, concise reports of basins formerly documented in an enormous array of diffuse literature. It additionally comprises a number of the first targeted debts of numerous basins that have by no means ahead of been defined in such intensity. those comprise the onshore Owambo, Iullemmeden, and Sudanese rift basins, and the offshore basins of southern Africa.The contributions are via authors, and groups of authors, with nice wisdom and adventure of the basins that they describe.The 13 chapters are prepared in three components protecting North Africa, critical Africa and Southern Africa and the e-book is illustrated by way of maps, cross-sections, stratigraphic sections and seismic traces. every one bankruptcy features a accomplished bibliography and the publication concludes with an issue index.For educational geologists studying the geology of Africa, and for business geologists looking common assets inside of African sedimentary rocks, this e-book is a useful resource of data.
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Extra resources for African Basins
These subcropping formations and basement are productive petroleum reservoirs within the Sirte basin. gressively younger formations moving westwards, and eastwards (Fig. 2). This reflects the truncation of the Tibesti-Sirte arch, prior to its collapse. The Precambrian basement includes a wide range of igneous and metamorphic rocks, that include granites and volcanics. When uplifted, weathered, and fractured these can serve as petroleum reservoirs, as in the Augila field (Williams, 1968, 1972). Another important rock type beneath the unconformity may be loosely termed quartzite.
0 I 500km J I ~ i i 0 I 500km I I I I I Fig. 7. Left: Structure contour map of the Sirte basin, drawn on the Sirte unconformity (approximate base mid-Cretaceous), from Goudarzi and Smith (1978), see also Goudarzi (1980). Right: Map of the Sirte basin to show the major tectonic features, and the locations of the cross-sections in Figs. 8 and 10. Abbreviations: Ho Gr: Hon graben, Ze/Ta Tr: Zella/Tagrifet trough, Da-Ho PI: Dahra-Hofra platform, Ra-Sa PI" Raguba-Samah platform, Ze-De PI" Zelten-Defa platform, Ja PI: Jahama platform, Ag/Br Tr: Agedabia/Brega trough, Am/Gi H: Amal/Gialo High, Ma/Ha Tr: Marada/Hagfa trough.
As discussed at length in Chapter 1, the Sahara is covered by a discontinuous blanket of unfossiliferous braided alluvial sands. Dates obtained from fauna in rare intervening shales show that the barren fluvial sands range in age from Precambrian to Recent. This makes it very difficult, if not impossible, when trying to produce a subcrop map of the floor of the Sirte basin. There has been a tendency for oil companies to generate a new formation name every time they encounter barren fluvial sands in a newly discovered oil fields.
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