Petrography and geochemistry of lower Paleozoic sandstones, East Sinai, Egypt: Implications for provenance and tectonic setting

Akarish, Adel I. M.; El-Gohary, Amr M.

doi:10.1016/j.jafrearsci.2008.04.002

Cited by 61 publications

(17 citation statements)

References 37 publications

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“…However the correlation values for Fe 2 O 3 , and Na 2 O, with Al 2 O 3 are negative suggesting their non association with phyllosilicates which implies probably other source of input (Figures 10 and 11). The correlation values with K 2 O (R 2 = 0.08) (Figure 12) are also positive suggesting the input of aluminosilicate and feldspar (Akarish & El Gohary, 2008). Negative correlation is shown by SiO 2 due to most of the silica being sequestered in quartz as indicated by Osman (1996) (Figure 13).…”

Section: Major Element Geochemistrymentioning

confidence: 85%

“…The very low values of K 2 O/Al 2 O 3 (0.01-0.07) suggest probably sedimentary recycling or increase in the degree of source area weathering (Bauluz et al, 2000). This can be backed-up by the increase in the value of Al 2 O 3 and Fe 2 O 3 (See Table 5) which is an indication of weathering and alteration (Akarish & El Gohary, 2008). (Dabard, 1990), this is also statistically suggested by the strong positive correlation between TiO 2 (%) and Al 2 O 3 (%) (Figure 9).…”

Section: Major Element Geochemistrymentioning

confidence: 98%

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Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Ikhane¹,

Akintola²,

Bankole³

et al. 2014

JGG

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The petrography, as well as the major, trace and rare earth element compositions of ten (10) sandstone samples of Maastrichtian Afowo Formation exposed near Igbile, Southwestern Nigeria, have been investigated to determine their provenance, source area weathering conditions, paleoclimate and tectonic setting using petrographic analysis and Inductively Coupled Plasma -Mass Spectrometry (ICP-MS).Results of the petrographic analysis revealed that quartz is the most dominant detrital mineral with (86%) followed by weathered plagioclase feldspar (5.10%) and rock fragments (10.9%). The quartz grain is sub-angular to sub-rounded in shape and the sandstones were classified as quartz arenites, sublitharenites and subarkoses based on framework composition of quartz, feldspar and rock fragment plots. This suggests a recycled orogen source for the sandstones and deposition in a humid climate, evidenced by the weathered feldspars. Eleven (11) major, seventeen (17) trace and fourteen (14) rare earth elements were obtained from the geochemical analysis. The major elements values range in concentration from 0.01%-81.39% with SiO 2 being the dominant oxide followed by Al 2 O 3 and Fe 2 O 3 constituting over 95% of the major oxides; K 2 O, TiO 2 , Na 2 O, CaO, MgO and P 2 O 5 made up the remaining 5%. The average ratio of SiO 2 /Al 2 O 3 valued 4.31 for the sandstone is appreciably high indicating that it has been heavily weathered. The trace elements range in concentration from 0.2 ppm-1651.2 ppm with Zr being the most dominant element an indication of orogenic recycling. The rare earth elements range in concentration from 0.01 ppm-163.7 ppm with Ce having the highest concentration, depicting that the sandstones were deposited in an oxidizing environment. Also, the trace element relationship illustrated from the spider plot shows chemical coherence and uniformity of the sandstones. The chondrite normalized rare earth elements (REE) plot shows enrichment in the Light REE over the heavy REE for the sediment with strong negative Eu anomaly values between (0.57-0.69) suggesting a felsic provenance derived from upper continental crust for the sandstones.

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Section: Major Element Geochemistrymentioning

confidence: 85%

Section: Major Element Geochemistrymentioning

confidence: 98%

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Ikhane¹,

Akintola²,

Bankole³

et al. 2014

JGG

View full text Add to dashboard Cite

show abstract

“…Therefore, such elemental enrichment and depletion can be used as a guide for estimating the intensity of chemical weathering for the siliciclastic source materials (Ghosh & Sarkar, ; Lee, ; Moradi et al, ; Pundaree et al, ). The concentrations of those chemical elements are generally controlled by weathering duration, diagenetic processes, original composition of the parent material, average tectonic uplift of the source region, and climatic variations (Akarish & El‐Gohary, ; Buggle, Glaser, Hambach, Gerasimenko, & Markovic, ; Ghosh & Sarkar, ; Hofmann, Li, Chen, MacKenzie, & Hinman, ; Moosavirad, Janardhana, Sethumadhav, Moghadam, & Shankara, ; Nagarajan et al, ).…”

Section: Discussionmentioning

confidence: 99%

Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering

et al. 2017

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Upper Cretaceous oil shales accumulated in intracratonic sedimentary basins along the Central Eastern Desert. Comprehensive geochemical analyses have been applied on 3 Maastrichtian oil shale horizons from the Duwi and Dakhla formations (El‐Beida and El‐Nakheil mines). We provide significant clues for chemical weathering, sediment recycling, petrogenesis, and tectonic setting of oil shales' source material. The mineralogical composition of the studied oil shales is generally characterized by carbonates, phyllosilicates, quartz, fluorapatite, and sulphides. The geochemistry is characterized by high Ca, P, Ni, U, and Cr values compared to standard post‐Archean Australian shales (PAAS). Their chondrite‐normalized patterns are distinguished by LREE enrichment, HREE depletion, negative Eu anomaly, and typical shale‐like PAAS‐normalized REE patterns. Furthermore, the total REE content is positively correlated with Si, K, Na, Fe, Al, Ti, and Mn, indicating that the REE of the investigated oil shales originated from terrigenous sources. Diverse proxies (e.g., CIA, CPA, and PIA) and the A–CN–K ternary diagram suppose that the source rock succession of the oil shales experienced moderate to intensive chemical weathering. Various geochemical parameters suggest that the oil shales were predominately derived from intermediate, with a minor contribution from felsic, igneous source rocks without any remarkable recycling signals. The average values of (Gd/Yb)N (1.39), Eu/Eu* (0.76), Th/U (0.29), and discrimination diagrams reveal that the oil shales were derived from Neoproterozoic island arc parent rocks. The geochemical results for oil shale provenance are in accordance with the composition and the palaeotectonic history of the igneous rocks in the Central Eastern Desert of Egypt.

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“…The presence of mixed altered and fresh feldspars may reflect immature sediments interfingered with submature phases. This would favour a weathered crystalline granitic source terrain (Akarish and El-Gohary 2008). The presence of plutonic (granite) and sedimentary (carbonate shell, quartzose siltstone and chert) rock fragments, suggesting that the Gebel El Rusas sandstones were derived mainly from relatively low lying granitoid and supplemented by recycled sands from associated platform or passive margin basins (Akarish and El-Gohary 2008).…”

Section: Provenancementioning

confidence: 99%

Petrography and geochemistry of the Middle Miocene Gebel El Rusas sandstones, Eastern Desert, Egypt: Implications for provenance and tectonic setting

Zaid

2017

J Earth Syst Sci

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Petrography and bulk rock geochemistry of the Middle Miocene sandstones of the lower and upper members of Gebel El Rusas Formation along the Egyptian Red Sea Coastal plain, have been investigated to determine the provenance, tectonic setting, and weathering condition of this formation. The Lower Member is formed mainly of sandstones and conglomerates with clay interbeds. The Upper Member is more calcareous and formed mainly of sandstones and limestones with marls and clays intercalations. Petrographically, the Lower Member sandstones are mostly immature and classified as arkoses with an average framework composition of Q 66 F 29 R 5 , and the Upper Member sandstones are partly submature (more quartzose, less feldspathic) and classified as subarkoses with an average framework composition of Q 80 F 17 R 3. The Gebel El Rusas sandstones are enriched in Sr, Ba, Zr and Rb and depleted in Co and U, as compared to UCC. The chemical index of alteration (CIA) values suggest moderate weathering conditions. The geochemistry results revealed that the Gebel El Rusas sandstones were derived from felsic-granitic source rocks and deposited in a passive margin of a synrift basin. The inferred tectonic setting for Middle Miocene Gebel El Rusas sandstones in the study area is consistent with the regional geology of the Eastern Desert of Egypt during Middle Miocene.

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Petrography and geochemistry of lower Paleozoic sandstones, East Sinai, Egypt: Implications for provenance and tectonic setting

Cited by 61 publications

References 37 publications

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Provenance Studies of Sandstone Facies Exposed Near Igbile Southwestern Nigeria: Petrographic and Geochemical Approach

Geochemical fingerprinting of Maastrichtian oil shales from the Central Eastern Desert, Egypt: Implications for provenance, tectonic setting, and source area weathering

Petrography and geochemistry of the Middle Miocene Gebel El Rusas sandstones, Eastern Desert, Egypt: Implications for provenance and tectonic setting

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