Distribution of polymorphs of aluminum hydroxides in the allophane-gibbsite rocks of the Volga region |
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| Authors: | V F Saltykov |
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| Institution: | (1) Geological Faculty, Saratov State University, ul. Astrakhanskaya 83, Saratov, 410012, Russia |
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| Abstract: | Distribution of polymorphs of aluminum hydroxides within an ore lode of allophone-gibbsite rocks of the Volga region has been studied and compared with the results of experimental research on the behavior of aluminum in diluted solutions. The XRD study of morphology and crystallinity of gibbsite confirmed trends noted by Ershova et al. (1979) for the lateritic-sedimentary bauxite series. In these rocks, bayerite and nordstrandite are typically secondary minerals with respect to gibbsite. In the rocks studied, bayerite and nordstrandite form at the early diagenetic stage that leads to decrease of gibbsite crystallinity. The crystallization model of minerals during the formation of the allophone-gibbsite rocks of the Volga region is proposed. |
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