engleski

Comparative methods for characterization of alumino-silicates in stream sediments

Stream sediments are formed by weathering of rocks, which are made up of complex mixture of minerals. As major mineral products of weathering, which are not so easily distinguished, are phyllosilicates. Their identification can give information about type of environment in which weathering occurred, namely was it acid or alkaline. In the present work we show results obtained on several stream sediments from Croatia, Slovenia and Bosnia and Herzegovina, and also on some modeled clays. The most powerful methods used were X-ray diffraction, Mössbauer spectroscopy and 27Al NMR techniques. The advantage of using these methods is that they do not depend on the sediment solubility. Such multidisciplinary investigation can be used in future sediment analysis, which will be necessary due to Decision No. 2455/2001/EC of the European Parliament and of the Council. It could also have application in planetary research, as complementary to proposed study on ocean sediments, simulating weathering conditions on Mars.

stream sediments; weathering; phyllosilicates; X-ray diffraction; Mössbauer spectroscopy; 27Al NMR

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