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A new method for quantitative petrography based on image processing of chemical element maps: Part I. Mineral mapping applied to compacted bentonites
-
Dimitri Prêt
,
Stephane Sammartino
Veröffentlicht/Copyright:
2. April 2015
Abstract
Most natural rocks or engineered materials display a multi-scale heterogeneity ranging from the nanometer to the centimeter. Their spatial textural heterogeneity can be approached from chemical element maps acquired using various techniques (SEM, EPMA, SXAM, synchrotron μ-XRF, TEM), depending on the chosen magnification. Chemical map processing that yields quantitative petrographic information is improved here according to newly developed mineral thresholding methods that accommodate mixtures and solid solutions. The complex case of an MX80 compacted bentonite is used as a test case. The 14 major chemical elements of this sample were mapped using an electron probe microanalyzer, and chemical map processing yielded a quantitative map of the 18 mineral species of bentonite with a spatial resolution of a few micrometers. The textural heterogeneity of the solid part of the sample is thus visualized and quantified on an area ranging between 0.1-1 cm2. The method also provides a complete modal analysis of the sample. The methodology is expected to have broad applications in Earth and materials sciences.
Keywords: Chemical map; mineral map; software; modal analysis; image analysis; texture; microstructure; electron microprobe
Received: 2009-10-23
Accepted: 2010-6-7
Published Online: 2015-4-2
Published in Print: 2010-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
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- A new method for quantitative petrography based on image processing of chemical element maps: Part I. Mineral mapping applied to compacted bentonites
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- The determination of sulfate and sulfide species in hydrous silicate glasses using Raman spectroscopy
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Schlagwörter für diesen Artikel
Chemical map;
mineral map;
software;
modal analysis;
image analysis;
texture;
microstructure;
electron microprobe
Artikel in diesem Heft
- Ti-Al zoning of experimentally grown titanite in the system CaO-Al2O3-TiO2-SiO2-NaCl-H2O-(F): Evidence for small-scale fluid heterogeneity
- A new method for quantitative petrography based on image processing of chemical element maps: Part I. Mineral mapping applied to compacted bentonites
- A new method for quantitative petrography based on image processing of chemical element maps: Part II. Semi-quantitative porosity maps superimposed on mineral maps
- Enhancement of solid-state reaction rates by non-hydrostatic stress effects on polycrystalline diffusion kinetics
- (H3O)Fe(SO4)2 formed by dehydrating rhomboclase and its potential existence on Mars
- Crystal chemistry and low-temperature behavior of datolite: A single-crystal X-ray diffraction study
- Density and seismic velocities of chromitite body in oceanic mantle peridotite
- Packing schemes of cavities in selected clathrasils and zeolites and the analogous packings of atoms in crystal structures
- Temperature dependence of IR absorption of OH species in clinopyroxene
- Thermal behavior of vibrational phonons and hydroxyls of muscovite in dehydroxylation: In situ high-temperature infrared spectroscopic investigations
- Kinetics of Fe-oxidation/deprotonation process in Fe-rich phlogopite under isothermal conditions
- On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K
- High-pressure melting of wüstite
- Primary Nb-Ta minerals in the Szklary pegmatite, Poland: New insights into controls of crystal chemistry and crystallization sequences
- Evolution of the interlayer space of hydrated montmorillonite as a function of temperature
- Morphology of pyrite in particulate matter from shallow submarine hydrothermal vents
- Influence of the fluid composition on diamond dissolution forms in carbonate melts
- Far infrared spectroscopy of carbonate minerals
- Assessment of the diamond-trap method for studying high-pressure fluids and melts and an improved freezing stage design for laser ablation ICP-MS analysis
- Françoisite-(Ce), a new mineral species from La Creusaz uranium deposit (Valais, Switzerland) and from Radium Ridge (Flinders Ranges, South Australia): Description and genesis
- Crystal chemistry and origin of grandidierite, ominelite, boralsilite, and werdingite from the Bory Granulite Massif, Czech Republic
- Lead-tellurium oxysalts from Otto Mountain near Baker, California: III. Thorneite, Pb6(Te26+O10)(CO3)Cl2(H2O), the first mineral with edge-sharing octahedral tellurate dimers
- Lead-tellurium oxysalts from Otto Mountain near Baker, California: IV. Markcooperite, Pb(UO2)Te6+O6, the first natural uranyl tellurate
- Lead-tellurium oxysalts from Otto Mountain near Baker, California: V. Timroseite, Pb2Cu52+(Te6+O6)2(OH)2, and paratimroseite, Pb2Cu42+(Te6+O6)2(H2O)2, two new tellurates with Te-Cu polyhedral sheets
- Lead-tellurium oxysalts from Otto Mountain near Baker, California: VI. Telluroperite, Pb3Te4+O4Cl2, the Te analog of perite and nadorite
- The determination of sulfate and sulfide species in hydrous silicate glasses using Raman spectroscopy
- The structure of crystals, glasses, and melts along the CaO-Al2O3 join: Results from Raman, Al L- and K-edge X-ray absorption, and 27Al NMR spectroscopy
- Ordering of iron vacancies in monoclinic jarosites
