A regional stratigraphic correlation for the upper Campanian phosphorites and associated rocks in Egypt and Jordan

Ahmad, Fayez; Farouk, Sherif; El-Moghny, Mohamed W. Abd

doi:10.1016/j.pgeola.2014.06.002

Cited by 34 publications

(17 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Abed and Ashour () provided a Maastrichtian age for the AHP Formation, based on the first appearance of the planktic foraminifera Gansserina gansseri within the sediment overlying the AHP Formation. Ahmad et al () reported the occurrence of calcareous nannofossil bioevents of Eiffellithus eximius and Reinhardtites anthophorus assigned a late Campanian age for the AHP Formation, which is confirmed by the 87 Sr/ 86 Sr ratios. The age assignment of the AHP Formation is late Campanian according to 87 Sr/ 86 Sr ratios from 0.707677 to 0.707714.…”

Section: Discussionmentioning

confidence: 91%

“…The base of this sequence is not exposed in the study section. In Jordan, the ASL/AHP formational boundary coincident with a sequence boundary characterized by a sharp vertical facies changes and paleoenvironments either in Jordan and Egypt (Ahmad et al, ). Sequence 1 can be divided into TST1 topped by MFS1 and HST1 as follows:…”

Section: Discussionmentioning

confidence: 99%

“…In Jordan (Figure ), the upper Cretaceous–lower Paleogene can be classified into the Ajlun Group (Cenomanian–Coniacian) composed of siliciclastic/carbonates and the Belqa Group (upper Coniacian–Eocene), dominated by pelagic chalks and marl with chert (Farouk, Marzouk, & Ahmad, ). The Campanian Amman Silicified Limestone (ASL) Formation is the oldest exposed rock unit in the studied area, with thickness ranging from 30 to 65 m. It consists of massively bedded limestone with grey‐brown to black chert with a thin phosphatic bed at the base (Ahmad et al, ; Farouk, Ahmad, Powell, & Marzouk, ). The ASL Formation unconformably overlies the Santonian Wadi Umm Ghudran Formation and underlies the upper Campanian Al‐Hisa Phosphorite (AHP) Formation.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The exact age of the Al‐Hisa Phosphorite Formation until now has been ambiguous due to a near absence of index microplanktic fauna as a result of shallower environments and/or lateral facies changes. This led to three different age attributions: late Campanian (Ahmad, Farouk, & Abed El‐Moghny, ; Powell, ; Powell & Mohd, ), late Campanian–Maastrichtian (Abed et al, ; Abed et al, ), and early middle Maastrichtian age (Abed, ; Abed & Ashour, ). In addition, facies analysis, petrography, and geochemical characteristics of the phosphorites and associated rocks and their diagenesis are still lacking in many of these previous studies.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Geochemistry and stable isotopes of the upper Campanian–lower Maastrichtian phosphorite‐bearing sequence, Central Jordan: Implications for their age, origin, and diagenesis

et al. 2019

Self Cite

View full text Add to dashboard Cite

Three major lithofacies have been described in Lajjun area, central Jordan, including the phosphorite and intercalated limestone of the Al-Hisa Phosphorite Formation, as well as the Muwaqqar Chalk Marl Formation. 87 Sr/ 86 Sr isotopic data indicate a late Campanian age for the Al-Hisa Phosphorite Formation, whereas the overlying chalk of the Muwaqqar Formation contains the lowest Maastrichtian planktic foraminiferal zone of Rugoglobigerina hexacamerata (CF8b). The phosphorites are of reworked origin as inferred from the homogeneous texture with lack of any concentric structure in the phosphatic pellets and the presence of bone fragments inside the phosphatic pellets, which are filled with phosphatic mud similar to the matrix of phosphatic pellet. They still reflect the original seawater rare-earth pattern, as indicated from the similarity in their rare-earth element (REE) concentration and patterns with seawater. Positive correlations between P 2 O 5 and Fe 2 O 3 , TiO 2 and K 2 O, relatively high rare-earth contents, and similarity in (Nd/Yb) SN ratio to the modern shallow seawater suggest a continental marginal depositional environment for the limestone and chalk facies. δ 13 C values are lower and more variable compared with the estimated global range of upper Campanian-lowerMaastrichtian δ 13 C values in shelf and oceanic basins. This indicates a diagenetic effect on the δ 13 C isotopes and suggests that a significant proportion of carbonate ions could have been resulted from the organic carbon oxidation. Three third-order depositional sequences matching with the global and regional sea-level patterns are identified in the studied section based on vertical facies changes. The basal transgressive surface of each sequence is constantly characterized by a phosphatic horizon.

show abstract

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Geologic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemistry and stable isotopes of the upper Campanian–lower Maastrichtian phosphorite‐bearing sequence, Central Jordan: Implications for their age, origin, and diagenesis

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“… Ahmad et al (2014). consider the regional stratigraphy of Campanian phosphorites in Egypt;Farrant et al (2014) present new evidence for the Cretaceous overstep in part of southwest England;Barron and Riding (2014) propose a revision of the Jurassic lithostratigraphy in northeast Scotland;Cope (2015) describes a detailed lithostratigraphy for the Kimmeridge Clay in southern England and Wright (2014) describes a new section through the Corallian Group in Wiltshire, southern England.…”

mentioning

confidence: 99%

Proceedings of the Geologists’ Association (PGA) Volume 126, Issue 1

Rose

2015

Proceedings of the Geologists' Association

View full text Add to dashboard Cite

Sedimentology and stratigraphy sequence of the north of Saudi Arabia: Implications for the evolution of the Neo‐Tethys in the Late Cretaceous

Zhang

Qin

et al. 2020

Geological Journal

View full text Add to dashboard Cite

The Late Cretaceous sediments on the margin of the Arabia Plate contain information of tectonics and eustatic fluctuation of the Neo‐Tethys Ocean. The sedimentary association in the north of Saudi Arabia, combined with that from Jordan, Israel, and Egypt, revealed three fourth‐order sedimentary sequences that occurred in the Late Cretaceous and Palaeogene. The evolution of the sequences indicates that a most extensive transgression occurred in the south of Neo‐Tethys Ocean during that time, which deposited phosphorite and carbonate overlying the Devonian sandstone directly. The occurrence of thin and interbedded lithological layers implies vigorous fluctuation of the sea‐level during the transgression. We argue that the transgression is the results of tectonic activities and eustatic fluctuation, but may be closely controlled by the regional subduction and Neo‐Tethys collision.

show abstract

A regional stratigraphic correlation for the upper Campanian phosphorites and associated rocks in Egypt and Jordan

Cited by 34 publications

References 42 publications

Geochemistry and stable isotopes of the upper Campanian–lower Maastrichtian phosphorite‐bearing sequence, Central Jordan: Implications for their age, origin, and diagenesis

Geochemistry and stable isotopes of the upper Campanian–lower Maastrichtian phosphorite‐bearing sequence, Central Jordan: Implications for their age, origin, and diagenesis

Proceedings of the Geologists’ Association (PGA) Volume 126, Issue 1

Sedimentology and stratigraphy sequence of the north of Saudi Arabia: Implications for the evolution of the Neo‐Tethys in the Late Cretaceous

Contact Info

Product

Resources

About