Discovery of Devonian scolecodonts from the subsurface Western Desert, Egypt

Shamma, Abdel Ghani A. El; Mostafa, Tarek F.; Makled, Walid A.

doi:10.1080/01916122.2018.1461143

Cited by 3 publications

(3 citation statements)

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“…punctatus that defined the middle Albian strata in northern Egypt (cf. Aboul Ela et al, ; El Shamma, Obied, & Mohammed, ; Gentzis, Carvajal‐Ortiz, Tahoun, Deaf, & Ocubalidet, ; Tahoun, Mostafa, Makled, & Saleh, ). Thus, the highest occurrence of C .…”

Section: Discussionmentioning

confidence: 99%

“…Thus, the highest occurrence of C . densimurus is commonly used over the Egyptian territory to delineate the top limit of the late Albian age, where the transition between the late Albian and early Cenomanian is placed upon such a palyno‐event (El Shamma et al, ; Gentzis et al, ). Within the upper part of the Kharita Formation, the marker species C .…”

Section: Discussionmentioning

confidence: 99%

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Geochemistry and palynology of the upper Albian at the Abu Gharadig Basin, southern Tethys: Constraints on the oceanic anoxic event 1d

et al. 2020

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The mid‐Cretaceous period was a time of abnormal polar temperature warming and consequent global oceanic anoxia that enhanced the widespread accumulation of organic matter‐rich marine sediments. The current contribution focuses on the late Albian oceanic anoxic subevent 1d (OAE 1d) that represents a period of increased perturbation of the global carbon cycle. Palynological and geochemical investigations, including TOC/Rock‐Eval pyrolysis and stable carbon isotope of organic matter (δ13CTOC), were conducted for the upper part of the Kharita Formation from the Abu Gharadig Basin, north Western Desert, Egypt, to (a) confirm the age of this unit, (b) assess the depositional environments and prevalent redox conditions, and (c) confirm the occurrence of the OAE 1d within the sedimentary record in this part of the southern Tethys. Based on the TOC content and Rock‐Eval pyrolysis parameters, the organic matter in the upper Kharita Formation is expected to have a limited hydrocarbon generation potential consisting of gas only. The sedimentation patterns and role of continental weathering and runoff influx were assessed through trace element ratios and relationships. Redox conditions were interpreted based on Stotal–TOC relationship, Stotal–TOC–Fetotal ternary plot, Rock‐Eval S2, trace element proxies and relationships (including Cr vs. V + Ni, V/Cr vs. Stotal, and Stotal/Fe vs. Mn/Stotal). The ratio of TOC/Ptotal was implemented to assess both marine primary productivity and oceanic anoxia during this period. Biostratigraphic constraints showed that the upper part of the Kharita Formation spanned a late Albian age (Cretacaeiporites densimurus Interval Zone). Results showed that the OAE 1d was characterized by organic matter deposition during dysoxic‐suboxic to anoxic redox conditions in a fluvio‐deltaic to shallow marine depositional environment in this part of the Tethys. A low to moderate primary productivity was also prevalent during a fairly high rate of sediment accumulation. Regional correlation of positive δ13CTOC excursion during the OAE 1d throughout the Tethys and Atlantic oceans matched well, in several parts, with the current study interval that confirm the global distribution of the OAE 1d. In this region of the southern Tethys, an overall collapse of water column stratification during the OAE 1d principally related to decreased terrestrial input at low relative sea level, as evidenced from freshwater algae Pediastrum and pteridophyte spore Crybelosporites pannuceus; however, orbital forcing likely induced monsoonal activity at low‐latitudes in the SE, N, and W Tethys.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Geochemistry and palynology of the upper Albian at the Abu Gharadig Basin, southern Tethys: Constraints on the oceanic anoxic event 1d

et al. 2020

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“…Silurian (El-Shamma and Baioumi 2003;El-Shamma et al 2011b;El-Shamma et al 2011a;Moustafa et al 2014). (Hutter 1979;EL Ghazaly and Ali 1985;El-Shamma et al 1998;El-Shamma et al 2011b;El-Shamma et al 2011a;El Shamma et al 2012a;Hosny 2012;Moustafa et al 2014;El-Shamma et al 2018;Makled et al 2020b;Mostafa 2020;Makled et al 2021). (Omara and Schultz 1965;Sultan 1977;EL Ghazaly and Ali 1985;Kora and Schultz 1987;Aboul Ela 1989b;Kora 1993;Zaslavskaya et al 1995;El-Shamma et al 1996;Atway 2003;El-Shamma et al 2011a;El Shamma et al 2012b;Moustafa et al 2014;Makled and Abdo 2017;El-Noamani and Tahoun 2019).…”

Section: Precambrian Palynology (Organic Microfossils)mentioning

confidence: 99%