Hydrochloric Acidic Processing of Titanite Ore to Produce a Synthetic Analogue of Korobitsynite
Л. Г. ГерасимоваА. И. НиколаевЕ. С. ЩукинаМ. В. МасловаGalina O. KalashnikovaGleb O. SamburovG. Yu. Ivanyuk
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Abstract:
The modal composition of (apatite)-nepheline-titanite ore and its geological setting within apatite deposits of the Khibiny Massif allow selective mining of titanite ore and its hydrochloric acidic processing. The reaction of titanite with concentrated hydrochloric acid produces hydrated titanosilicate precipitate (TSP) which, in turn, can be a precursor in titanosilicate synthesis. It is particularly noteworthy that a synthetic analogue of korobitsynite, Na5(Ti3Nb)[Si4O12]2O2(OH)2·7H2O, was synthesized by means of TSP alteration by alkaline hydrothermal solution at 200 °C within three days. The titanosilicate obtained this way has comparatively weak cation-exchange properties regarding Cs+ and Sr2+ cations and considerable photocatalytic activity occurring under visible light, which allows the use of a synthetic korobitsynite analogue (SKR) for production of self-cleaning, sterilizing, and anti-fouling building materials.Keywords:
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This paper reports on geochronological U–Pb studies of baddeleyite from nepheline syenite of the Korgere–Daba alkaline massif, which is the largest massif within the Sangilen Highlands (Tyva). The established age of rocks, 295 ± 1 Ma, indicates that, in the Early Permian, undersaturation by silica magmatism occurred in the region in addition to the alkaline-granite magmatism (Ulug–Tanzek, etc.). This age furthermore points to the need to make corrections in the conceptions of a petrophysical type for the Devonian Sangilen complex, which is traditionally distinguished in this region. Until now, the Korgere–Daba massif has been considered in this regard.
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Titanite 是为因为它的相对高的 U， Th 和 Pb 的同位素的标明日期满足的 U-Pb 的一种理想的矿物质。这里，我们为用 193 nm ArF 激光脱离系统和 Agilent 7500a Q-ICP-MS titanite 标明日期的 U-Pb 开发了一种技术。titanite (BLR-1 和 OLT-1 ) 和锆石的标准(91500 并且 GJ-1 ) 被标明日期使用单个点和线光栅扫描分析方法。为了检查矩阵，效果， titanite (BLR-1 ) 和锆石(91500 ) 标准作为外部标准被分析。OLT-1 titanite 的加权的吝啬的 206Pb/238U 年龄是 1015
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Abstract Titanite can be found in rocks of wide compositional range, is reactive, growing or regrowing during metamorphic and hydrothermal events, and is generally amenable to U–Pb geochronology. Experimental evidence suggest that titanite has a closure temperature for Pb ranging from 550 to 650°C, and thus titanite dates are commonly interpreted as cooling ages. However, this view has been challenged in recent years by evidence from natural titanite which suggests the closure temperature may be significantly higher (up to 800°C). Here, we investigate titanite in an enclave of migmatitic gneiss included within a granite intrusion. The titanite crystals exhibit textural features characteristic of fluid‐mediated mass transfer processes on length scales of <100 µm. These textural features are associated with variation in both Pb concentrations and distinct U–Pb isotopic compositions. Zr‐in‐titanite thermometry indicates that modification of the titanite occurred at temperatures in excess of 840°C, in the presence of a high‐ T silicate melt. The Pb concentration gradients preserved in these titanite crystals are used to determine the diffusivity of Pb in titanite under high‐ T conditions. We estimate diffusivities ranging from 2 × 10 −22 to 5 × 10 −25 m 2 /s. These results are significantly lower than experimental data predict yet are consistent with other empirical data on natural titanites, suggesting that Pb diffusivity is similar to that of Sr. Thus our data challenge the wide‐held assumption that U–Pb titanite dates only reflect cooling ages.
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