搜索结果: 1-9 共查到“地质学 Tourmaline”相关记录9条 . 查询时间(0.109 秒)
Nomenclature of the tourmaline-supergroup minerals
Tourmaline mineral chemistry nomenclature substitutions order-disorder
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2013/12/6
A nomenclature for tourmaline-supergroup minerals is based on chemical systematics using the generalized tourmaline structural formula: XY3Z6(T6O18)(BO3)3V3W, where the most common ions(or vacancy) at...
Tetrahedral boron in naturally occurring tourmaline
Tetrahedral boron naturally occurring tourmaline
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2012/4/1
Evidence for boron in both trigonal and tetrahedral coordination has been found in B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectra ofnatural, inclusion-free speci-mens of alumin...
Intrusive chemical characterization of tourmaline: M鰏sbauer study of Fe valance and site occupancy
M鰏sbauer study site occupancy Fe valance Intrusive chemical characterization of tourmaline
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2012/3/31
Our recent paper noted that ?#8734;some of the existing [M?ssbauer] studies (e.g., Fuchs et al. 1995) should be discounted due to th
fact that peak widths are less than the theoretical minimum impose...
Chemistry and genetic implications of tourmaline and Li-F-Cs micas from the Valdeflores area (Cáceres, Spain)
Valdeflores area tourmaline-rich rocks Li-F-Cs
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2012/3/30
Pervasivemetasomatismthatinvolvedtheformationoftourmaline-richrocksandin?ux
ofLi,F,andCsintoOrdovicianpsammo-peliticmetasedimentsoccurredintheValde?ores
area(Ca!ceres,Spain).NumerousLi-andSn-bearing...
Rossmanite [](LiAl2)Al6(Si6O18)(BO3)3(OH)4, a new alkali-deficient tourmaline: Description and crystal structure
Rossmanite [](LiAl2)Al6(Si6O18)(BO3)3(OH)4 alkali-deficient tourmaline crystal structure
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2012/4/1
Rossmanite is a new tourmaline species from near Rozˇna´, western Moravia, Czech Republic. It forms pale pink columnar crystals about 25 mm long and 5 mm thick, elon-gated along c with striation...
Inclusive chemical characterization of tourmaline: Mossbauer study of Fe valence and site occupancy
Inclusive chemical characterization Mossbauer Fe site occupancy
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2012/4/1
We report here the results of a series of inclusive chemical characterizations, including all elements except oxygen, for a suite of 54 tourmaline samples. A combination of analytical techniques was u...
Transmission electron microscopy of muscovite alteration of tourmaline
Transmission electron microscopy muscovite alteration tourmaline
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2012/3/31
Partially sericitized tourmaline from a pegmatite was investigated using high-resolution transmission electron microscopy (HRTEM). Fine-grained muscovite crystals form exten-sive narrow veinlets prefe...
Fe-tourmaline synthesis under different T and FO2 conditions
Fe-tourmaline synthesis Mo╯sbauer spectrometry
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2012/3/31
Mo╯sbauer spectrometry of natural samples of tourmaline shows the presence of Fe21 and Fe31 either in the Y (9b) or the Z (18c) sites, with intervalent iron delocalized between these sites. To underst...
Evolution of compositional polarity and zoning in tourmaline during prograde metamorphism of sedimentary rocks in the Swiss Central Alps
Evolution polarity zoning tourmaline metamorphism sedimentary rocks Swiss Central Alps
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2012/4/6
Thecompositional evolution oftourmaline from diageneticto lower amphibolite-facies conditions wasinvestigated in two metasedimentary units (redbed and black shale for-mations)alongatraverse across the...