Fabric analysis using the intercept method

Launeau, Patrick; Robin, Pierre-Yves F.

doi:10.1016/s0040-1951(96)00091-1

Cited by 200 publications

(158 citation statements)

References 12 publications

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“…This method known as Mean Intercept Length (MIL) has been popularized in earth sciences by Launeau and Robin (1996) to deliver average grain size, aspect ratio and azimuth information from binary images in thin sections. It has been recently extended to grey level intercepts (MIL g ) in order Fig.…”

Section: Grey Level Intercepts For Texture Analysismentioning

confidence: 99%

“…Each analysis along a scanning direction α results in a grey level intercept distribution with a mean value that is directly related to the average grain size in the given direction (Launeau and Robin, 1996). A convenient representation of the results is a rose of intercepts based on percentiles of directional distributions (Lebichot et al, 2005).…”

Section: Grey Level Intercepts For Texture Analysismentioning

confidence: 99%

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Particle texture analysis using polarized light imaging and grey level intercepts

Pirard

Lebichot

Krier

2007

International Journal of Mineral Processing

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The usual characterization of particulate ore material with image analysis includes modal analysis and liberation analysis. Both methods include stereological corrections based on intercept length distributions within each phase of interest. The first principle of stereology relies on a simple assumption of uniform random sectioning, whereas the liberation models require all particles to have similar textural properties. However, for the sake of adequate prediction of ore behavior in industrial processes it is becoming more and more important to be able to describe particle populations in terms of texture classes.Among the texture analysis techniques, this paper focuses on mean intercept length (MIL). It brings two important improvements: the first one is to improve grain boundary imaging by using images of bireflectant minerals under plane polarized illumination, the second one is to consider intercept analysis on grey level images instead of binary ones. The method is illustrated on a selection of critical hematite textures found within banded iron formations.

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Section: Grey Level Intercepts For Texture Analysismentioning

confidence: 99%

Section: Grey Level Intercepts For Texture Analysismentioning

confidence: 99%

Particle texture analysis using polarized light imaging and grey level intercepts

Pirard

Lebichot

Krier

2007

International Journal of Mineral Processing

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“…Também foram aplicados os métodos do tensor de inércia (Launeau & Cruden 1998) e dos Interceptos (Launeau et al 1990, Launeau & Robin 1996. Para os cálculos dos parâmetros de orientação e forma foram utilizados os programas Rf/Phi versão 1.0 (Mulchrone & Lisle 1999e Mulchrone & Meere 2001, baseado na técnica de Peach & Lisle (1979), RFPSHIM (Brandon 1996) fundamentado em Shimamoto & Ikeda (1976), Intercepts v. 2003(Launeau & Robin 2003a) e SPO v. 2003(Launeau e Robin 2003b.…”

Section: Sérgio Wilians De Oliveira Rodrigues and Frederico Meira Faleirosunclassified

“…(Launeau & Robin 1996), originalmente desenvolvido para quantificação de tramas de rochas ígneas, analisa camadas de objetos (fases) como uma população de linhas. A partir da seleção de fase a ser analisada, por exemplo um intervalo específico de tons de cinza em uma imagem, é feita uma contagem dos interceptos.…”

Section: Tensor De Inérciaunclassified

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Avaliação de métodos de quantificação da deformação finita por meio de simulações computacionais de deformação progressiva

Rodrigues

Faleiros

2007

RBG

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Magma flow pattern in dykes of the Azores revealed by anisotropy of magnetic susceptibility

2015

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The localization of magma melting areas at the lithosphere bottom in extensional volcanic domains is poorly understood. Large polygenetic volcanoes of long duration and their associated magma chambers suggest that melting at depth may be focused at specific points within the mantle. To validate the hypothesis that the magma feeding a mafic crust, comes from permanent localized crustal reservoirs, it is necessary to map the fossilized magma flow within the crustal planar intrusions. Using the AMS, we obtain magmatic flow vectors from 34 alkaline basaltic dykes from São Jorge, São Miguel and Santa Maria islands in the Azores Archipelago, a hot-spot related triple junction. The dykes contain titanomagnetite showing a wide spectrum of solid solution ranging from Ti-rich to Ti-poor compositions with vestiges of maghemitization. Most of the dykes exhibit a normal magnetic fabric. The orientation of the magnetic lineation k 1 axis is more variable than that of the k3 axis, which is generally well grouped. The dykes of São Jorge and São Miguel show a predominance of subhorizontal magmatic flows. In Santa Maria the deduced flow pattern is less systematic changing from subhorizontal in the southern part of the island to oblique in north. These results suggest that the ascent of magma beneath the islands of Azores is predominantly over localized melting sources and then collected within shallow magma chambers. According to this concept, dykes in the upper levels of the crust propagate laterally away from these magma chambers thus feeding the lava flows observed at the surface.

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Fabric analysis using the intercept method

Cited by 200 publications

References 12 publications

Particle texture analysis using polarized light imaging and grey level intercepts

Particle texture analysis using polarized light imaging and grey level intercepts

Avaliação de métodos de quantificação da deformação finita por meio de simulações computacionais de deformação progressiva

Magma flow pattern in dykes of the Azores revealed by anisotropy of magnetic susceptibility

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