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The P_2O_5 content of feldspars from the Yashan granites,Jiangxi Province, South China

Chinese Science Bulletin 1999年第13期44卷 1245-1248页

作者： HUANG Xiaolong, WANG Rucheng , LIU Changshi, YIN Lin, CHEN Xiaoming and CHEN PeirongState Key Laboratory of Mineral Deposit Research , Department of Earth Sciences , Nanjing University, Nanjing 210093 , China Corresponding author State Key Laboratory of Mineral Depit Research Department of Earth Scienc Nanjing University Nanjing China

The P2O5 contents of feldspars in the Yashan F-rich and P-rich granite yield a maximum value of 0.93% （in albite） and a maximum average value of 0.65% （hereinafter weight percent）（in K-feldspar）, and is generally between 0.10% and 0.35%. Most of the distribution coefficient Dp[Ab/Kf] values are greater than 1 （1.13—28.9）. The study shows that phosphorus could preferably enter the albite structure mainly by PAISi2 substitution relative to K-feldspar.

关键词： phosphorus content feldspars PAISi2 substitution.

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Potential of Some Granites from Foumban (West Region of Cameroon) as Fluxing Materials for Ceramics

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Journal of Minerals and Materials Characterization and Engineering 2020年第5期8卷 353-363页

作者： Njimbouombouo Mouliom Soualiou Etone Macka Alexandre Dodo Ondoua Abondo Ebengue Yannick Che Randy Nangah Njoya André Mouncherou Oumar Farouk Ndigui Billong University of Yaounde I Yaounde Cameroon

This study focuses on the mineralogical, geochemical and petrographic characterization of three granite rock samples (LTP, LTS and LTMB) from Foumban, West Region of Cameroon. Fusibility tests were carried out on the samples containing the highest amount of alkali to assess the potential of these materials as fluxing admixture for ceramics. The results show that the granite consists of alkaline feldspars, notably orthoclase and microcline of perthitic micro-texture, plagioclases (in particular albite) and also mafic minerals such as amphibole and pyroxene. The quantity of alkali in the samples is quite high (16.83% for LTS, 17.08% for LTMB and 18.87% for LTP) compared to standard data. Fusibility tests carried out on the samples having the highest alkali content (LTMB and LTP) showed that the vitreous phase appears between 1050°C and 1100°C in these samples when they were heated. The Fe2O3 and TiO2 content of LTMB (3.01% and 1.49% respectively) led to a brown colour of its fired product. Therefore, based on their composition, these materials can be used as feldspathic fluxes for the formulation of ceramic products.

关键词： feldspars Granite Characterization Fusibility Ceramics Foumban Cameroon

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Features of the Mineral Composition of the Quaternary Sediments of the Development Areas of the Erosion Processes on the Territory of the Tunkinsk’s Depression

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Journal of Geological Resource and Engineering 2019年第4期7卷 113-122页

作者： S.I.Shtel’makh L.A.Pavlova T.G.Ryashchenko Institute of the Earth’s Crust SB RAS128 Lermontov St.Irkutsk 664033Russia Institute of Geochemistry Named after A.P.Vinogradov SB RAS1A Favorskiy St.Irkutsk 664033Russia

The article considers the some features of the Quaternary sediments mineral composition of the development areas of the erosion processes on the territory of the Tunkinsk’s *** objectives of our research are to determine the entering forms of Na,Mg,Al,Si,P,S,K,Ca,Ti,Cr,Mn,Fe,Zn,Cu,Zr,and Ba in the composition of the investigated *** mineral composition was studied by the method of an electron probe X-ray spectral microanalysis(XRM)using wave spectrometers,and the method of X-ray diffraction *** localization centers of Cr,Cu,Zn,Zr,and Ba were established in the mineral composition of the studied *** content of BaO(14.42 wt%)was detected in alkali K-feldspar in the clay sediments of modern alluvial complex(aQ4).Crystallochemical formulas of different minerals were obtained.

关键词： Electron probe X-ray spectral microanalysis mineral composition Quaternary sediments feldspars ore minerals

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