3-D microstructure of olivine in complex geological materials reconstructed by correlative X-ray μ-CT and EBSD analyses

2017 ◽  
Vol 268 (2) ◽  
pp. 193-207 ◽  
Author(s):  
W.-A. KAHL ◽  
N. DILISSEN ◽  
K. HIDAS ◽  
C.J. GARRIDO ◽  
V. LÓPEZ-SÁNCHEZ-VIZCAÍNO ◽  
...  
Keyword(s):  
X Ray ◽  
Geological Materials

X-Ray Fluorescence Minor- and Trace-Element Analyses Silicate Rocks in the Presence of Large Interelement Effects

1977 ◽  
Vol 21 ◽  
pp. 75-88
Author(s):  
B. S. King ◽  
L. F. Espos ◽  
B. P. Fabbi
Keyword(s):  
Matrix Effects ◽  
Dilution Method ◽  
Regression Equations ◽  
X Ray ◽  
Geological Materials ◽  
Accuracy And Precision ◽  
Binder Ratio ◽  
Silicate Rocks ◽  
Good Agreement

An X-ray fluorescence (XRF) method has been devised for the rapid quantitative determination of 16 minor and trace elements in geological materials. This method, a modification of a direct dilution method (1, 2, 3), uses a sample-to-binder ratio of 85:15 for sample preparation. Pellets prepared by this method are durable and do not deteriorate rapidly when exposed to high X-ray irradiation. Interferences and matrix effects are successfully corrected in actual analyses by employment of multiple linear regression equations.Accuracy and precision have been improved over the method previously used in this laboratory. Detection limits have been lowered for Zn, Rb, Y and Zn approximately by the factor of 2. When interelement corrections are made, the XRF values are found to be in good agreement with the preferred chemical values for the 19 international silicate-rock standards.

scholarly journals Application of benchtop micro-XRF to geological materials

2017 ◽  
Vol 81 (4) ◽  
pp. 923-948 ◽  
Author(s):  
Stephanie Flude ◽  
Michael Haschke ◽  
Michael Storey
Keyword(s):  
Quantitative Analysis ◽  
Trace Element Analysis ◽  
Isotopic Analysis ◽  
International Standards ◽  
Simple Type ◽  
Fundamental Parameter ◽  
Internal Reference ◽  
Element Analysis ◽  
X Ray ◽  
Geological Materials

AbstractRecent developments in X-ray optics have allowed the development of a range of commercially available benchtop micro-XRF (μ-XRF) instruments that can produce X-ray spot sizes of 20–30 μm on the sample, allowing major- and trace-element analysis on a range of sample types and sizes with minimal sample preparation. Such instruments offer quantitative analysis using fundamental parameter based 'standardless' quantification algorithms. The accuracy and precision of this quantitative analysis on geological materials, and application of micro-XRF to wider geological problems is assessed using a single benchtop micro-XRF instrument. Quantitative analysis of internal reference materials and international standards shows that such instruments can provide highly reproducible data but that, for many silicate materials, standardless quantification is not accurate.Accuracy can be improved, however, by using a simple type-calibration against a reference material of similar matrix and composition. Qualitative analysis with micro-XRF can simplify and streamline sample characterization and processing for subsequent geochemical and isotopic analysis.

A method for measuring X-ray mass-absorption coefficients of geological materials

1980 ◽  
Vol 28 ◽  
pp. 341-347 ◽  
Author(s):  
J. Sumartojo ◽  
M.W. Paris
Keyword(s):  
Absorption Coefficients ◽  
X Ray ◽  
Geological Materials ◽  
Mass Absorption

Characterization of Natural Slip Materials Geologically Found in the North of the State of Rio de Janeiro, Brazil

2014 ◽  
Vol 798-799 ◽  
pp. 33-38
Author(s):  
Zélia Maria Peixoto Chrispim ◽  
Maria da Gloria Alves ◽  
Luciana Lezira Pereira de Almeida ◽  
Jonas Alexandre ◽  
Afonso Rangel Garcez de Azevedo ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Rio De Janeiro ◽  
Ceramic Industry ◽  
Particle Size Analysis ◽  
The State ◽  
Size Analysis ◽  
X Ray ◽  
Geological Materials ◽  
The North

Slip is a semifluid clayey type of material used in the ceramic industry for coating earthware products, such as bricks and tiles, thus providing distinct surface colors or patterns. In the present work a characterization was conducted to identify the mineralogical as well the chemical and physical properties of geological materials existing in the slip used by industries in the north region of the state of Rio de Janeiro, Brazil. The basic natural materials composing a slip, namely clay and kaolin, are responsible for changes not only the slip plasticity but also in its viscosity and adhesion to the surface of the ceramic piece. The slip characterization was performed in terms of particle size analysis, Atterberg limits and actual grain density. The chemical composition was obtained by X-ray fluorescence and the thermal properties by differential thermal analysis. The results indicated that marked differences exist between slip from distinct origins. A few slip samples failed to present the required properties.

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