Distribution and segregation of trace elements during the growth of ore mineral crystals in hydrothermal systems: geochemical and mineralogical implications |
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| Authors: | VL Tauson SV Lipko NV Smagunov RG Kravtsova KYu Arsent’ev |
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| Institution: | 1. A.P. Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, ul. Favorskogo 1a, Irkutsk, 664033, Russia;2. Limnological Institute, Siberian Branch of Russian Academy of Sciences, ul. Ulan-Batorskaya 3, Irkutsk, 664033, Russia |
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| Abstract: | The interfacial crystal layer of poorly soluble mineral grown under hydrothermal conditions is modified chemically into a surficial nonautonomous phase (SNAP) and, in this capacity, takes part in growth process, doing several important functions. This paper considers some of them related to geochemistry and mineralogy. The new interpretation is given to the following phenomena: (1) selection of components during crystal growth in multiphase associations; (2) stability of multiphase parageneses having a common chemical component; (3) dual character of the distribution coefficients due to different properties of the crystal volume and SNAP; (4) formation of nano- and microinclusions of unusual composition different from the basic mineral phase; (5) spatial ordering of nano- and microparticles during their directed aggregation at the growing crystal face; (6) accumulation of valuable components (primarily noble metals), incompatible in most of mineral matrixes, in the surficial layer; and (7) effect of “hidden” metal content, associated with the presence of noble metals in the SNAP or of nano- and microinclusions formed during the SNAP evolution. |
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| Keywords: | crystal growth trace elements surface element distribution segregation microinclusions aggregation noble metals structural impurities surface-bound impurities |
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