Topic
Silicate minerals
About: Silicate minerals is a research topic. Over the lifetime, 1794 publications have been published within this topic receiving 67064 citations.
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TL;DR: In this paper, Mesozoic granites associated with rare earth element (REE)-rich weathered crust deposits in southernmost Jiangxi Province indicate that they have high-K to shoshonite compositions and belong to ilmenite-series I-type granites.
Abstract: Studies of Mesozoic granites associated with rare earth element (REE)-rich weathered crust deposits in southernmost Jiangxi Province indicate that they have high-K to shoshonite compositions and belong to ilmenite-series I-type granites. Of the studied rocks at 59–292 ppm of bulk REE content, the highest are seen in the biotite granites of Dingnan (358, 429 ppm) and mafic biotite granite of the Wuliting Granite (344 ppm) near the Dajishan tungsten mine, both areas where weathered-crust REE deposits occur. REE-bearing accessory minerals in these granites are mainly zircon, apatite and allanite, and REE-fluorocarbonates are common. REE enrichment occurs in the rims of apatite crystals, and in fluorocarbonates that occur along grain boundaries of and cracks in major silicate minerals, and in fluorocarbonates that replaced altered biotite. It is therefore thought that a major part of the REE content of these granites was concentrated during deuteric activity, rather than during magmatic crystallization. The crack-filling REE-fluorocarbonates could subsequently have been easily leached out and deposited in weathered crust developed during a long period of exposure.
45 citations
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TL;DR: In this paper, the authors discuss the properties of coffinite, a uranous silicate mineral, which is newly discovered at the time of this report's publication, and discuss its properties.
Abstract: Report discussing the properties of coffinite, a uranous silicate mineral. Coffinite was newly discovered at the time of this report's publication.
45 citations
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TL;DR: In this paper, the site preferences of individual transition metal ions in the olivine, orthopyroxene and clinopyroxenes structures have been predicted from the mean metal-oxygen distances, site distortion, cation size and crystal field criteria.
45 citations
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TL;DR: The relationship between subglacial chemical weathering processes and the Sr isotope composition of runoff from Robertson Glacier, Alberta, Canada, is investigated in this paper, where the provenance of solute in meltwaters is found to vary systematically with solute concentration and, by inference, subglastic water residence time.
45 citations