FLUORINE MINERALISATION FROM BURNING COAL SPOIL-HEAPS IN THE RUSSIAN URALS
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dc.contributor.author | Sokol E.V. | |
dc.contributor.author | Nigmatulina E.N. | |
dc.contributor.author | Volkova N.I. | |
dc.date.accessioned | 2021-09-23T04:09:44Z | |
dc.date.available | 2021-09-23T04:09:44Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13396726 | |
dc.identifier.citation | Mineralogy and Petrology, 2002, 75, 1-2, 23-40 | |
dc.identifier.issn | 0930-0708 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30495 | |
dc.description.abstract | Anhydrous iron, aluminum and fluorine-rich paralavas were found in the burned spoil-heaps of the Chelyabinsk coal basin, Russia. The rocks contain tridymite, anorthite, ferroan fluorine-bearing cordierite, fluorine-bearing mullite, periclase, fluorapatite, micas of the F-biotite–F-phlogopite series, fluortopaz, fluorite, and sellaite. The fluorine-rich minerals formed as a result of local thermal reactions of sedimentary carbonates and silicates with gaseous fluorine. During coal combustion fluorine concentrates in the annealed ankeritic marls where the increase of F is hundreds of times over its concentration in the initial sedimentary rocks. The formation of MgF2 and CaF2 promotes local melting at relatively low temperatures (T<1000°C) with the residuum consisting of two immiscible liquids. One crystallises as the fluorides, the other as fluorine-substituted analogues of the hydrosilicates, which under the extremely dry conditions, produce minerals containing extremely high F-contents. | |
dc.title | FLUORINE MINERALISATION FROM BURNING COAL SPOIL-HEAPS IN THE RUSSIAN URALS | |
dc.type | Статья |
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