 |
| Titel |
Sedimentary provenance of Maastrichtian oil shales, Central Eastern Desert, Egypt |
| VerfasserIn |
Douaa Fathy, Michael Wagreich, Ramadan S. Mohamed, Rafat Zaki |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137537
|
| Publikation (Nr.) |
 EGU/EGU2017-283.pdf |
|
|
|
|
|
| Zusammenfassung |
| Maastrichtian oil shales are distributed within the Central Eastern Desert in Egypt. In this
study elemental geochemical data have been applied to investigate the probable provenance
of the sedimentary detrital material of the Maastrichtian oil shale beds within the Duwi and
the Dakhla formations. The Maastrichtian oil shales are characterized by the enrichment in
Ca, P, Mo, Ni, Zn, U, Cr and Sr versus post-Archean Australian shales (PAAS). The
chondrite-normalized patterns of the Maastrichtian oil shale samples are showing LREE
enrichment, HREE depletion, slightly negative Eu anomaly, no obvious Ce anomaly and
typical shale-like PAAS-normalized patterns. The total REE well correlated with Si, Al,
Fe, K and Ti, suggesting that the REE of the Maastrichtian oil shales are derived
from terrigenous source. Chemical weathering indices such as Chemical Index of
Alteration (CIA), Chemical Proxy of Alteration (CPA) and Plagioclase Index of
Alteration (PIA) indicate moderate to strong chemical weathering. We suggest that the
Maastrichtian oil shale is mainly derived from first cycle rocks especially intermediate rocks
without any significant inputs from recycled or mature sources. The proposed data
illustrated the impact of the parent material composition on evolution of oil shale
chemistry. Furthermore, the paleo-tectonic setting of the detrital source rocks for the
Maastrichtian oil shale is probably related to Proterozoic continental island arcs |
|
|
|
|
|
|