| Инд. авторы: | Gilinskaya L.G., Zanin Y.N. |
| Заглавие: | Geochemistry of organic matter in natural apatites of phosphorites according to EPR spectra of free radicals |
| Библ. ссылка: | Gilinskaya L.G., Zanin Y.N. Geochemistry of organic matter in natural apatites of phosphorites according to EPR spectra of free radicals // Geochemistry International. - 2012. - Vol.50. - Iss. 12. - P.1007-1025. - ISSN 0016-7029. - EISSN 1531-8397. |
| Внешние системы: | DOI: 10.1134/S0016702912120026; SCOPUS: 2-s2.0-84870590718; |
| Реферат: | eng: The following organic radicals were identified by EPR spectroscopy in apatite from marine phosphorites (granular, nodular, shelly, and microcrystalline), supergene phosphorites (from ocean islands only), and modern and fossil biological materials (human dental enamel, fossil shark teeth, and pathogenic cardioliths): ĊH3, ĊH2-R, HOĊHR,(CH3)2-ĊR,3̇org, PO32-, P(OR)3, and perinapht{eth}enyl. Each textural and petrographic type of apatite corresponds to a specific model of organic radicals, which correlates with the type of organic matter (sapropelic, humic, guano, or collagen). The latter is controlled by the conditions of mineral formation, including climatic ones, and postdiagenetic (catagenetic) processes. A relationship was established between the EPR spectra of observed organic radicals and the valence state and structural position of impurity ions: (1) vanadium: V4+ (VO2+) in the Ca2+ II site or V5+ (VO4)3- → (PO4)3- and (2) uranium: U4+(UO2) in the Ca2+ II site or U6+ chemisorbed on the surface as UO22+ © 2012 Pleiades Publishing, Ltd. |
| Ключевые слова: | vanadium; uranium; texture; supergene process; phosphorite; petrography; paleoclimate; organic matter; geochemistry; free radical; electron spin resonance; apatite; Electron spin resonance spectroscopy; Vanadium compounds; Vanadium; Uranium; Phosphate deposits; Chondrichthyes; Manures; Free radicals; Chemisorption; Biological materials; Biogeochemistry; Apatite; Vanadyl complexes; Paleoclimates; Organic radicals; Natural apatites; EPR spectra; vanadyl complexes; paleoclimate; organic radicals; natural apatite from phosphorites; EPR spectra; Organic compounds; |
| Издано: | 2012 |
| Физ. характеристика: | с.1007-1025 |