THERMAL DECOMPOSITION OF FERRIAN CHAMOSITE: AN INFRARED EMISSION SPECTROSCOPIC STUDY
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dc.contributor.author | Kloprogge J.T. | |
dc.contributor.author | Frost R.L. | |
dc.date.accessioned | 2021-01-25T02:42:44Z | |
dc.date.available | 2021-01-25T02:42:44Z | |
dc.date.issued | 2000 | |
dc.identifier | https://elibrary.ru/item.asp?id=984764 | |
dc.identifier.citation | Contributions to Mineralogy and Petrology, 2000, 138, 1, 0059-0067 | |
dc.identifier.issn | 0010-7999 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/23736 | |
dc.description.abstract | The thermal behaviour of ripidolite, an iron-rich chlorite, has been studied in situ by infrared emission spectroscopy up to 800 °C. The more di,trioctahedral nature due to significant amounts of Fe3+ is reflected, in addition to the two bands around 3420 and 3560 cm-1, by an extra band around 3345 cm-1. This extra band is absent in pure dioctahedral chlorites without Fe3+. These bands have been assigned to (AlAl)O-OH, (SiAl)O-OH and (SiSi)O-OH stretching modes with increasing frequencies. The bands disappear upon dehydroxylation around 650 °C. A similar behaviour is observed for the corresponding libration modes around 716, 759 and 802 cm-1. The stretching and bending modes of the inner-OH of the octahedral sheet in the 2:1 clay-like layer are observed around 3645, 943 and 904 cm-1. Although the bands decrease in intensity, they remain present up to 800 °C as dehydroxylation of the octahedral sheet is not yet complete at this temperature. The presence of two bending modes is explained as being due to a differentiation between Mg-OH and Fe-OH modes. At 650 °C a new sharp band is observed around 502 cm-1 assigned to a (Fe,Mg)-O-Al bending mode caused by the formation of a spinel-like interlayer phase after dehydroxylation. | |
dc.title | THERMAL DECOMPOSITION OF FERRIAN CHAMOSITE: AN INFRARED EMISSION SPECTROSCOPIC STUDY | |
dc.type | Статья |
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