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Nanophase REE phosphate crystallization induced by vivianite oxidation: mechanistic insights and mineralogical implications. [PDF]
RSC AdvMaddin M +4 more
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Phosphate-Solubilizing Microbiota of Compost Elicited with Different Silicon Oxide Nanostructures to Increase Their Mineralization and Solubilization Properties. [PDF]
MicroorganismsGuevara-Santana MDP +7 more
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Lithology and Mineral Resources, 2001
The uranium concentration in phosphorites on continents and modern seafloor varies from 0.nto n· 102ppm (average 75 ppm). The average uranium concentration is 4–48 ppm in Precambrian and Cambrian deposits, 20–90 ppm in Paleozoic and Jurassic deposits, 40–130 ppm in Late Cretaceous–Paleogene deposits, 30–130 ppm in Neogene deposits, and 30–110 ppm in ...
G. N. Baturin, A. V. Kochenov
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The uranium concentration in phosphorites on continents and modern seafloor varies from 0.nto n· 102ppm (average 75 ppm). The average uranium concentration is 4–48 ppm in Precambrian and Cambrian deposits, 20–90 ppm in Paleozoic and Jurassic deposits, 40–130 ppm in Late Cretaceous–Paleogene deposits, 30–130 ppm in Neogene deposits, and 30–110 ppm in ...
G. N. Baturin, A. V. Kochenov
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Nomenclature descriptive des phosphorites. Descriptive nomenclature of phosphorites
Sciences Géologiques. Bulletin, 1989Cette note rappelle, précise et complète la nomenclature des phosphorites proposée en 1978 à la première réunion du projet 156 «Phosphorites » du Programme International de Corrélation Géologique. Elle détaille d'abord la structure de la terminologie préconisée en indiquant l'influence sur le nom de la roche des proportions relatives des composants ...
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Thermal transformations in phosphorites
Journal of Thermal Analysis, 1997Abstract The thermal transformations in phosphorites during flash calcination were investigated by FT-IR spectroscopy, X-ray diffraction and chemical analyses. During flash calcination changes occur, both in the composition of the phosphorite and in the crystallochemistry of the fluor-carbonate-apatite (francolite).
R. Knubovets +3 more
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Annual Review of Earth and Planetary Sciences, 1981
Marine phosphorites have been studied for more than a hundred years, both because of their commercial value as fertilizer and because of their importance to sedimentary petrology. Phosphorus is, of course, one of the basic plant nutrients and is intimately involved in biospheric processes ; however, its role in biogenic and chemogenic sedimentation is ...
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Marine phosphorites have been studied for more than a hundred years, both because of their commercial value as fertilizer and because of their importance to sedimentary petrology. Phosphorus is, of course, one of the basic plant nutrients and is intimately involved in biospheric processes ; however, its role in biogenic and chemogenic sedimentation is ...
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Uranium in supergene phosphorites
Geochemistry International, 2007The distribution of uranium was studied in supergene phosphorites from the zones of the weathering of sedimentary and endogenous rocks, as well as in nonmarine coprolitic phosphorites and, to a lesser extent, phosphorites from ocean islands. These phosphorites show a diversity of the composition of their carbonate-apatite and structural characteristics.
Yu. N. Zanin, A. G. Zamirailova
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1980
During the Xth International Congress on Sedimentology, a symposium on marine phosphorites was held in Jerusalem, Israel, 9-14 July 1978. This volume contains the papers delivered at this meeting and represents the main interests inspiring the study of phosphorites at the end of the seventies.
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During the Xth International Congress on Sedimentology, a symposium on marine phosphorites was held in Jerusalem, Israel, 9-14 July 1978. This volume contains the papers delivered at this meeting and represents the main interests inspiring the study of phosphorites at the end of the seventies.
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Economic Geology, 1966
Contemporaneous or prior existence of calcium carbonate as a necessary condition for formation of phosphorites is an unwarranted assumption (Pevear, ibid., p. 251-266).
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Contemporaneous or prior existence of calcium carbonate as a necessary condition for formation of phosphorites is an unwarranted assumption (Pevear, ibid., p. 251-266).
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