Sulfides in phosphorites of Africain Island: Morphological peculiarities and origin |
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| Authors: | A. I. Gorshkov G. N. Baturin O. Yu. Bogdanova L. O. Magazina |
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| Affiliation: | (1) Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, 109017 Moscow, Russia;(2) Shirshov Institute of Oceanology, Russian Academy of Sciences, Nakhimovskii pr. 36, 117851 Moscow, Russia |
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| Abstract: | The investigation of phosphorites from Africain Island situated in the Indian Ocean revealed that they contain iron sulfides in the form of framboids consisting of separate crystallites, as well as fine-dispersed colloidal particles of micrometer and submicrometer size. Crystallites consist of pyrite, whereas colloidal matter consists of troilite, which is initially formed as hydrogel inside voids. During the subsequent interaction of gelatinous troilite with sulfur, pyrite crystals are formed. The growth of crystals inside a 10987ted microvoid space in the rock leads to their dense hexagonal and tetragonal packing. |
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