High Mg-glauconite in the Campanian Duwi Formation of Abu Tartur Plateau, Egypt and its implications

Banerjee, Santanu; Farouk, Sherif; Nagm, Emad; Choudhury, Tathagata Roy; Meena, Sher Singh

doi:10.1016/j.jafrearsci.2019.05.001

Cited by 22 publications

(7 citation statements)

References 57 publications

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“…In this study, for the first time, we investigated glauconite as an inhibitor for urea release. Glauconite is potassium phyllosilicate (clay mineral) with a dioctahedral structure [29][30][31][32] distributed in ancient marine sediments [33][34][35][36][37][38]. Due to the high content of K 2 O (up to 8-9%), glauconite can serve as an independent unconventional potash fertilizer [39][40][41][42][43][44][45] that has a prolonged effect [46].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

et al. 2019

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We investigated the mechanochemical synthesis of complex slow release fertilizers (SRF) derived from glauconite. We studied the effectiveness of the mechanical intercalation of urea into glauconite using planetary and ring mills. The potassium-nitric complex SRFs were synthesized via a mechanochemical method mixing glauconite with urea in a 3:1 ratio. The obtained composites were analyzed using X-ray diffraction analysis, scanning electron microscopy, X-ray fluorescence analysis, and infrared spectroscopy. The results show that as duration of mechanochemical activation increases, the mineralogical, chemical, and structural characteristics of composites change. Essential modifications associated with a decrease in absorbed urea and the formation of microcrystallites were observed when the planetary milling time increased from 5 to 10 min and the ring milling from 15 to 30 min. Complete intercalation of urea into glauconite was achieved by 20 min grinding in a planetary mill or 60 min in a ring mill. Urea intercalation in glauconite occurs much faster when using a planetary mill compared to a ring mill.

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Section: Introductionmentioning

confidence: 99%

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

et al. 2019

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“…The high value of the (001) peak is consistent with 'nascent' to 'slightly evolved' glauconite [45]. The subdued (002) and (004) reflections distinguish the glauconitic minerals in Giral samples from illite and indicate the high octahedral iron [43,[46][47][48]. The minor peak at 7.07 Å in air-dried and glycolated samples, which disappears after heating at 550 • C, mark the presence of kaolinite [47,48].…”

Section: Mineralogy and Micro-textural Study Of Glauconitementioning

confidence: 83%

“…The basal (001) reflection of glauconite appears within 10 Å and 14 Å. The ordered glauconite has a 10 Å basal spacing while the smectite minerals exhibit 14 Å basal spacing [1,[12][13][14][15]43]. The basal reflection of the (001) plane at 11.89 Å in air-dried Giral samples expands upon glycolation, indicating considerable smectite interstratification within glauconite [44].…”

Section: Mineralogy and Micro-textural Study Of Glauconitementioning

confidence: 98%

Paleoenvironmental Conditions during the Paleocene–Eocene Transition Imprinted within the Glauconitic Giral Member of the Barmer Basin, India

et al. 2021

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The roughly 6 m thick limestone–green shale alternation within the lignite-bearing Giral Member of the Barmer Basin corresponds to a marine flooding event immediately after the Paleocene–Eocene transition. A detailed characterization of the glauconite using Electron Probe Micro Analyzer (EPMA), X-Ray Diffraction (XRD), Mössbauer and Field Emission Gun-Scanning Electron Microscope (FEG-SEM) reveals its origin in the backdrop of prevailing warm climatic conditions. The glauconite pellets vary from fine silt-sized to coarse sand-sized pellets, often reaching ~60% of the rock by volume. Mineralogical investigation reveals a ‘nascent’ to ‘slightly evolved’ character of the marginal marine-originated glauconite showing considerable interstratification. The chemical composition of the glauconite is unusual with a high Al2O3 (>10 wt%) and moderately high Fe2O3(total) contents (>15 wt%). While the K2O content of these glauconites is low, the interlayer sites are atypically rich in Na2O, frequently occupying ~33% of the total interlayer sites. The Mössbauer spectrum indicates 10% of the total iron is in ferrous form. High tetrahedral Al3+ of these glauconites suggests a high-alumina substrate that transformed to glauconite by octahedral Al-for-Fe substitution followed by the addition of K into the interlayer structure. The unusually high Na2O suggests the possibility of a soda-rich pore water formed by the dissolution of alkaline volcanic minerals. The Giral glauconite formation could have been a part of the major contributors in the Fe-sequestration cycle in the Early Eocene shelves. Warm climate during the Early Eocene time favored the glauconitization because of the enhanced supply of Fe, Al, and Si and proliferation of an oxygen-depleted depositional environment.

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“…Phosphorite is a common associate of glauconite in the Paleogene (Glenn and Arthur 1990;Kouwenhoven et al 1997;Kechiched et al 2018;Metwally and Mahfouz 2018;Banerjee et al 2019). Conditions favourable for the precipitation of phosphorite and glauconite broadly overlap, requiring depletion in clastic supply and oxygen-depleted seawater.…”

Section: Factors Promoting Phosphorite Deposition During the Paleogenmentioning

confidence: 99%

“…The biostratigraphically constrained sections in the Paleogene provide an opportunity to explore whether the occurrence of glauconite depended on subtle changes in palaeo-oceanographic conditions corresponding to warm climatic intervals. Phosphorite is a common associate of the Late Cretaceous glauconites, particularly Tethyan deposits (Banerjee et al 2019). Lignite, phosphorite, and ironstone deposits of commercial importance are well known in the Paleogene sedimentary succession.…”

Section: Introductionmentioning

confidence: 99%

The formation of authigenic deposits during Paleogene warm climatic intervals: a review

et al. 2020

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Although Paleogene warm climatic intervals have received considerable attention for atmospheric and oceanographic changes, the authigenic mineralization associated with these time spans remains overlooked. An extensive review of the literature reveals a close correspondence between the high abundance of glauconite and warm climatic intervals during the Paleogene period. The abundance of phosphorite, ironstone, lignite and black shale deposits reveals similar trends. Although investigated thoroughly, the origin of these authigenic deposits is never understood in the background of Paleogene warming climatic intervals. A combination of factors like warm seawater, hypoxic shelf, low rate of sedimentation, and enhanced rate of continental weathering facilitated the glauconitization. The last factor caused the excess supply of nutrients, including Fe, Si, K, Mg and Al through the rivers, the cations needed for the formation of glauconite. The excessive inflow of nutrient-rich freshwater into the shallow seas further ensured high organic productivity and stratification in shallow shelves, causing hypoxia. The consequent rapid rise in sea-level during the warm periods created extensive low-relief shallow marine shelves starved in sediments. Oxygen-deficiency in the shallow marine environment facilitated the fixation of Fe into the glauconite structure. The inflow of nutrient-rich water during the warm climatic intervals facilitated the formation of phosphorite, ironstone, and organic-matter-rich sedimentary deposits as well. Although global factors primarily controlled the formation of these authigenic deposits, local factors played significant roles in some of the deposits. Therefore, phosphorites formed in marine conditions with open circulation within the tropical zone. While lush growth of rainforest covers in the tropical belt facilitated the formation of coastal lignite.

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High Mg-glauconite in the Campanian Duwi Formation of Abu Tartur Plateau, Egypt and its implications

Cited by 22 publications

References 57 publications

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Mechanochemical Preparation of Slow Release Fertilizer Based on Glauconite–Urea Complexes

Paleoenvironmental Conditions during the Paleocene–Eocene Transition Imprinted within the Glauconitic Giral Member of the Barmer Basin, India

The formation of authigenic deposits during Paleogene warm climatic intervals: a review

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