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Showing 1 to 12 of 12 for “"Phosphorites"”.
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Sedimentology and diagenesis of Ediacaran phosphorites from South China
Ediacaran phosphorites provide a principal record of the paleoenvironmental and paleoecological conditions of the oceans during Earth's second major oxygenation and the evolution of complex life. Although the fidelity of this record is high, diagenesis and metamorphism frequently alter or overprint …
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Iron minerals in sedimentary phosphorites of the southeastern United States
… minerals associated with these sedimentary phosphorites are related to the geologic setting and degree of weathering of the deposit. Pyrite and marcasite (FeS₂) are the principal iron mineral inclusions in unweathered phosphorites of Florida, North Carolina, and Tennessee, and occur as …
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Petrographic and geochemical evidence for the origin of phosphorites and phosphate rocks from the West Coast of South Africa
The onshore marine phosphorite and aluminium phosphate deposits of Varswater Quarry (near Langebaanweg), Bomgat (near Hoedjiespunt), Kreefte Bay and Konstabelkop were studied to determine the origin of the various deposits.
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Sedimentological study of the western zone of the Lady Annie phosphate deposit, Queensland, Australia
… understanding the spatial relationships between phosphorites and associated non-phosphatic sediments within the same overall palaeoenvironment. Field mapping and measurement of stratigraphic sequences and palaeocurrent data resulted in the recognition of eight major sedimentary lithofacies: a …
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Sedimentological study of the western zone of the Lady Annie phosphate deposit, Queensland, Australia
… understanding the spatial relationships between phosphorites and associated non-phosphatic sediments within the same overall palaeoenvironment. Field mapping and measurement of stratigraphic sequences and palaeocurrent data resulted in the recognition of eight major sedimentary lithofacies: a …
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The petrography and major element geochemistry of the phosphorite nodule deposits on the Agulhas Bank, South Africa
… CO₂ concentration in the apatite phase of the phosphorites. Studies on the major element geochemistry of the various phosphorite classes has shown that the bulk geochemistry of the nodules corresponds to the dominant mineralogy and that variations in the bulk geochemistry of the nodules from …
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ΘΕΡΜΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΤΟΥ ΣΥΣΤΗΜΑΤΟΣ CAHP04.2H20-CA(H2P04)2.H20-SI02 ΚΑΙ ΟΞΙΝΟΘΕΡΜΙΚΗ ΕΠΕΞΕΡΓΑΣΙΑ ΤΩΝ ΦΤΩΧΩΝ ΦΩΣΦΟΡΙΤΩΝ (ΗΠΕΙΡΟΥ)
… PHOSPHATE ROCK PROVED THAT IT IS A POOR PHOSPHORITES WITH MAIN USEFUL ORE THE FLUORAPATITE AND MAIN IMPURITIES QUARTZ, WHICH CAN NOT BE BENEFICIATED SATISFACTORILY FOR FURTHER WET PROCESS TREATMENT. THE UTILIZATION OF THE PHOSPHATE ROCK FOR THE PRODUCTION OF POLYPHOSPHATE FERTILIZERS, BY …
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Microbial Communities Associated with Phosphoclast-bearing Sediments of the Benguela Upwelling Zone
… Calcium phosphate mineral deposits, known as phosphorites, are also the primary source of P for agriculture. Understanding phosphorite formation may improve management of P resources. However, the processes that mediate calcium phosphate mineral precipitation in certain marine pore waters …
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Spatial and temporal variations in the geometry and composition of the Permian Whitehill Formation South Africa
… reported. A binary mixture of organic matter and phosphorites with botryoidal textures is also abundant. The upper medium to light grey calcareous-siliceous silty lenticular shale (F3-F5) contain up to 2.04% TOC, δ¹³Corg of -24.71‰, δ¹⁵N of 4.93‰, C/N ratio of 17.62, average CIA of 74.33, Rb/K …
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Sedimentation on the continental margin off the Orange River and the Namib Desert
… which are overlain by glauconitic conglomeratic phosphorites. Quartz-free algal limestones are found both on the Orange Banks and on the tip of Tripp Seamount. Authigenic pyrite and gypsum were found in two samples of semi-consolidated Neogene clay on the slope off Lüderitz. Pyrite is formed by …
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The lateral and vertical limits of a hypothetical Republic of South Africa continental shelf according with international law and, in particular, Articles 76, 83 and 84 of the United Nations Law of the Sea Convention (1982)
… defined in LOSC, extensive oil and gas reserves phosphorites, manganese nodules and diamonds make up more than 90% of the value of the total. Some of the lesser important resources include sand and gravel, titanium, tin, chromium, and zirconium. Pools of brine contain concentrations of lead, …