Full analysis of feldspar texture and crystal structure by combining X-ray and electron techniques
-
Tonči Balić-Žunić
Abstract
Feldspar crystals typically show a range of exsolution and polysynthetic twinning textures that can present problems for their full characterization, but at the same time give important information about their genesis. We present an integrated procedure for the micro-texture analysis, twin law identification plus crystal structure refinement of all components in a feldspar intergrowth. This procedure was applied to perthitic intergrowths in feldspars from two different pegmatites in the Larvik plutonic complex in the southern part of the Oslo region, Norway. It revealed that the two starting high-temperature (HT) feldspars had similar global chemical compositions but underwent significantly different cooling histories, with cooling times probably differing by over an order of magnitude. Powder X-ray diffraction with Rietveld refinement was used for a preliminary identification of the mineral components and concluding quantitative phase analysis. Electron microprobe analysis was used to bracket the chemical compositions of the constituents. Electron backscatter diffraction was used to reveal the texture of the samples, twin laws and spatial distribution and crystallographic orientation of the crystal domains. Single-grain X-ray diffraction recorded by an area detector was applied for a simultaneous integration of reflection intensities for all crystallographic domains with different orientations and severe diffraction overlaps. The crystal structures were refined using the program JANA2006 that allows a simultaneous calculation for structurally different components. Combined results of various methods helped improve accuracy and resolve ambiguities that arise from the application of a single technique. The approach is widely applicable to the study of mineral intergrowths and bridges an existing gap in the routinely accessible data on the structural characteristics of rock constituents.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- H/D isotope effects in brucite at low temperatures
- Coupled H and Nb, Cr, and V trace element behavior in synthetic rutile at 600 °C, 400 MPa and possible geological application
- Dissolution-reprecipitation vs. solid-state diffusion: Mechanism of mineral transformations in sylvanite, (AuAg)2Te4, under hydrothermal conditions
- Compression and structure of brucite to 31 GPa from synchrotron X-ray diffraction and infrared spectroscopy studies
- Full analysis of feldspar texture and crystal structure by combining X-ray and electron techniques
- Correlating planar microstructures in shocked zircon from the Vredefort Dome at multiple scales: Crystallographic modeling, external and internal imaging, and EBSD structural analysis
- A spectroscopic and carbon-isotope study of mixed-habit diamonds: Impurity characteristics and growth environment
- Thermal infrared and Raman microspectroscopy of moganite-bearing rocks
- Mineralogical characterization and formation of Fe-Si oxyhydroxide deposits from modern seafloor hydrothermal vents
- Cathodoluminescence properties of quartz eyes from porphyry-type deposits: Implications for the origin of quartz
- Microbeam X-ray analysis of Ce3+/Ce4+ in Ti-rich minerals: A case study with titanite (sphene) with implications for multivalent trace element substitution in minerals
- Aluminum ordering and clustering in Al-rich synthetic phlogopite: The influence of fluorine investigated by {19F/1H} 29Si CPMAS NMR spectroscopy
- DFT+U investigation of the catalytic properties of ferruginous clay
- A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 °C: Applications to zeolites
- Nanopores in hematite (α-Fe2O3) nanocrystals observed by electron tomography
- Berthierine-like mineral formation and stability during the interaction of kaolinite with metallic iron at 90 °C under anoxic and oxic conditions
- An X-ray diffraction study of the pressure-induced hydration in cordierite at 4–5 GPa
- Natural occurrence of keatite precipitates in UHP clinopyroxene from the Kokchetav Massif: A TEM investigation
- High-pressure Raman spectroscopy, vibrational mode calculation, and heat capacity calculation of calcium ferrite-type MgAl2O4 and CaAl2O4
- First-principles study on the high-pressure phase transition and elasticity of KAlSi3O8 hollandite
- Zircon growth and recrystallization during progressive metamorphism, Barrovian zones, Scotland
- Saltonseaite, K3NaMn2+Cl6, the Mn analogue of rinneite from the Salton Sea, California
- Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.
- Quadratite, AgCdAsS3: Chemical composition, crystal structure, and OD character
- Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part I. Crystal structure of hereroite, [Pb32O20(O,⃞)](AsO4)2[(Si,As,V,Mo)O4]2Cl10
- Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part II. Crystal structure of vladkrivovichevite, [Pb32O18][Pb4Mn2O]Cl14(BO3)8·2H2O
- Amorphous materials: Properties, structure, and durability: Acceleration and inhibition effects of phosphate on phase transformation of amorphous calcium carbonate into vaterite
- Letter: Implications of equilibrium and disequilibrium among crystal phases in the Bishop Tuff
- Letter: Actinides in Geology, Energy, and the Environment: Chemistry and radiation effects of davidite
Articles in the same Issue
- H/D isotope effects in brucite at low temperatures
- Coupled H and Nb, Cr, and V trace element behavior in synthetic rutile at 600 °C, 400 MPa and possible geological application
- Dissolution-reprecipitation vs. solid-state diffusion: Mechanism of mineral transformations in sylvanite, (AuAg)2Te4, under hydrothermal conditions
- Compression and structure of brucite to 31 GPa from synchrotron X-ray diffraction and infrared spectroscopy studies
- Full analysis of feldspar texture and crystal structure by combining X-ray and electron techniques
- Correlating planar microstructures in shocked zircon from the Vredefort Dome at multiple scales: Crystallographic modeling, external and internal imaging, and EBSD structural analysis
- A spectroscopic and carbon-isotope study of mixed-habit diamonds: Impurity characteristics and growth environment
- Thermal infrared and Raman microspectroscopy of moganite-bearing rocks
- Mineralogical characterization and formation of Fe-Si oxyhydroxide deposits from modern seafloor hydrothermal vents
- Cathodoluminescence properties of quartz eyes from porphyry-type deposits: Implications for the origin of quartz
- Microbeam X-ray analysis of Ce3+/Ce4+ in Ti-rich minerals: A case study with titanite (sphene) with implications for multivalent trace element substitution in minerals
- Aluminum ordering and clustering in Al-rich synthetic phlogopite: The influence of fluorine investigated by {19F/1H} 29Si CPMAS NMR spectroscopy
- DFT+U investigation of the catalytic properties of ferruginous clay
- A thermodynamic model for silica and aluminum in alkaline solutions with high ionic strength at elevated temperatures up to 100 °C: Applications to zeolites
- Nanopores in hematite (α-Fe2O3) nanocrystals observed by electron tomography
- Berthierine-like mineral formation and stability during the interaction of kaolinite with metallic iron at 90 °C under anoxic and oxic conditions
- An X-ray diffraction study of the pressure-induced hydration in cordierite at 4–5 GPa
- Natural occurrence of keatite precipitates in UHP clinopyroxene from the Kokchetav Massif: A TEM investigation
- High-pressure Raman spectroscopy, vibrational mode calculation, and heat capacity calculation of calcium ferrite-type MgAl2O4 and CaAl2O4
- First-principles study on the high-pressure phase transition and elasticity of KAlSi3O8 hollandite
- Zircon growth and recrystallization during progressive metamorphism, Barrovian zones, Scotland
- Saltonseaite, K3NaMn2+Cl6, the Mn analogue of rinneite from the Salton Sea, California
- Rongibbsite, Pb2(Si4Al)O11(OH), a new zeolitic aluminosilicate mineral with an interrupted framework from Maricopa County, Arizona, U.S.A.
- Quadratite, AgCdAsS3: Chemical composition, crystal structure, and OD character
- Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part I. Crystal structure of hereroite, [Pb32O20(O,⃞)](AsO4)2[(Si,As,V,Mo)O4]2Cl10
- Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part II. Crystal structure of vladkrivovichevite, [Pb32O18][Pb4Mn2O]Cl14(BO3)8·2H2O
- Amorphous materials: Properties, structure, and durability: Acceleration and inhibition effects of phosphate on phase transformation of amorphous calcium carbonate into vaterite
- Letter: Implications of equilibrium and disequilibrium among crystal phases in the Bishop Tuff
- Letter: Actinides in Geology, Energy, and the Environment: Chemistry and radiation effects of davidite
