GIS-based detection of grain boundaries

Li, Yingkui; Onasch, Charles M.; Guo, Youming

doi:10.1016/j.jsg.2007.12.007

Cited by 39 publications

(51 citation statements)

References 17 publications

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“…Microstructures of samples collected throughout the Calanchiole and Felciaio shear zones were studied using optical and scanning electron microscopy (SEM) in conjunction with quantitative image analysis carried out on digital micrographs and SEM images. An automated grain boundary detection method by geographic information system (GIS) software was employed on the digital images (Li et al, 2008) to perform microstructural analysis (Appendix 1). The Calanchiole and Felciaio shear zones ( Fig.…”

Section: Shear Zones In the Porto Azzurro Pluton Contact Aureolementioning

confidence: 99%

“…According to Li et al (2008), the raster format of the images is converted to vector format and refi ned using editing tools in the GIS environment to obtain a straightforward match between the input images and the fi nal vectorized grain outlines. The grain boundary map of the sample analyzed is then built by GIS data management functions, which automatically generate the shape and several other attributes of the grains.…”

Section: Appendix: Automated Grain Boundary Detection By Gis Softwarementioning

confidence: 99%

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Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Musumeci¹,

Vaselli²

2012

Geosphere

106

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In the northern Tyrrhenian Sea, late Miocene \ud intrusions (Monte Capanne pluton and\ud Porto Azzurro pluton) were emplaced at\ud upper crustal levels (<0.2 GPa) in the thrust\ud systems of Elba Island. The emplacement\ud of intrusive rocks is currently explained\ud in the context of late Miocene extensional\ud tec tonics. New detailed structural data\ud collected along a continuous natural cross\ud section through the contact aureole of the\ud Porto Azzurro pluton (eastern Elba) where\ud strain localization has occurred within two\ud west-dipping decameter-scale carbonate\ud shear zones, namely the Calanchiole and\ud Felciaio shear zones, are reported here.\ud These shear zones, characterized by a lithological\ud difference with calcite and dolomite\ud marbles dominant in the Calanchiole and\ud Felciaio shear zones, respectively, exhibit\ud a similar rheological behavior . They represent\ud two weakened layers in which westdipping\ud mylonitic foliation, sheath folds,\ud boudinage structures, and upright folds\ud developed within the contact aureole .\ud Moreover, in correspondence with the\ud Felciaio shear zone, the inversion of metamorphic\ud facies occurs. Meso- and microstructural\ud data give evidence that most of\ud the deformation and displacement in the\ud shear zones was coeval with contact metamorphism\ud and developed under metamorphic\ud conditions retrograde from pyroxene\ud hornfels to hornblende-hornfels facies.\ud Geometric and kinematic features indicate\ud that both shear zones correspond to ductile\ud thrusts, which led to internal stacking of the\ud contact aureole . Therefore, at Elba Island,\ud emplacement of intrusive rocks coeval with\ud late Miocene crustal shortening gives a new\ud perspective on relations between tectonics\ud and magmatism in the northern Apennines

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Section: Shear Zones In the Porto Azzurro Pluton Contact Aureolementioning

confidence: 99%

Section: Appendix: Automated Grain Boundary Detection By Gis Softwarementioning

confidence: 99%

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Musumeci¹,

Vaselli²

2012

Geosphere

106

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“…One potential technique is the method described by Li et al (2008), which was used to delineate grain 15 boundaries in rock thin sections. In this method, edge detection is based on the abrupt change in pixel values, representing brightness, at the boundary between two grains (or IW polygons).…”

Section: Semi-automated Delineation Methodsmentioning

confidence: 99%

An Estimate of Ice Wedge Volume for a High Arctic Polar Desert Environment, Fosheim Peninsula, Ellesmere Island

Bernard-Grand'Maison¹,

Pollard²

2018

Preprint

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Abstract. Quantifying ground ice volume on a regional scale is necessary to assess the vulnerability of permafrost landscapes to thaw induced disturbance like terrain subsidence and to quantify potential carbon release. Ice wedges (IWs) are a ubiquitous ground ice landform in the Arctic. Their high spatial variability makes generalizing their potential role in landscape change problematic. IWs form polygonal networks visible on satellite imagery from active layer surface troughs. This study focuses 10 on the estimation of IW ice volume for the Fosheim Peninsula, Ellesmere Island, a continuous permafrost area characterized by polar desert conditions and extensive ground ice. We perform basic GIS analyses on high resolution satellite imagery to delineate IW troughs and estimate the associated IW ice volume using a 3D subsurface model. We demonstrate two semiautomated IW trough delineation methods with different strengths to increase time-efficiency of this process, done manually in previous studies. Our methods yield acceptable IW ice volume estimates validating the value of GIS to estimate IW volume 15 on much larger scales. We estimate that IWs are potentially present on 50% of the Fosheim Peninsula (± 3,000 km 2 ) where 3.81 % of the top 5.9 m of permafrost could be IW ice.

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“…A number of papers have proposed using geographic information system (GIS) software to identify grain boundaries and handle the dataset (e.g. Barraud 2006;Li et al 2008). For the moment, most petrographers seem to use a combination of simple thresholding and manual image editing, or crystal outline tracing.…”

Section: Advances In 2d Methodoloogymentioning

confidence: 99%

Igneous Rock Associations 17. Advances in the Textural Quantification of Crystalline Rocks

Higgins

2015

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SUMMARYDuring the last 20 years, textural (microstructural) studies have regained their place in the pantheon of petrographic methods. This has happened by quantifying textures, so that models can be developed and tested -an approach that has proved to be so successful for chemical and isotopic studies. The combination of chemical, isotopic and textural methods, especially if applied to different crystal populations, can be a very powerful tool in the clarification of petrologic histories of rocks. Here, I will discuss some recent advances in the application of textural studies to crystalline rocks. RÉSUMÉAu cours des 20 dernières années, les études de texture (microstructure) ont retrouvé leur place au panthéon des méthodes pétrographiques. Cela a pu se produire grâce à la quantification des textures, permettant ainsi de développer et tester des modèles -une approche qui s'est avérée très béné-fique pour les études chimiques et isotopiques. La combinaison de méthodes chimiques, isotopiques et d'analyse texturale, en particulier si elles sont appliquées à des populations distinctes de cristaux, peut être un outil très puissant permettant de définir l'histoire pétrologique des roches. Dans le présent article, je vais discuter de certaines percées récentes dans l'application d'études texturales de roches cristallines.Traduit par le Traducteur INTRODUCTION Petrography started in the 19 th century with the development of the petrographic microscope ( Fig. 1; Kile 2003). Initial observations were qualitative, except for modal measurements. However, the development of quantitative chemical and isotopic analysis in the 20 th century somewhat eclipsed traditional petrographic studies and has come to dominate petrology. This is understandable: quantitative measurements do enable more rigorous testing of petrologic models. However, petrography started to regain lost ground about 25 years ago, when quantitative materials science methodology was first applied to petrologic problems (e.g. Cashman and Marsh 1988). Many of the best studies now use a combination of geochemical, isotopic and textural approaches (see review in Higgins 2006).As with all analytical methods, the scale of observation, which can also be considered as the analytical volume, is dictated by the methods used and will provide information on different aspects of the petrological evolution of the rock. For instance, a whole rock chemical analysis provides data on a large volume of material whereas microprobe analyses convey information about individual crystals or parts of crystals. In a similar way, some textural analysis methods supply information on whole crystal populations, whereas others can inform us on individual crystals.There are many definitions of rock texture (microstructure), but the simplest is the geometric arrangement of crystals or other structures in a rock. This is a 'crystal map,' in the sense that it is a simplified representation of the actual structure of a rock. Such maps are actually three dimensional, but are commonly measured or r...

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GIS-based detection of grain boundaries

Cited by 39 publications

References 17 publications

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

Neogene deformation and granite emplacement in the metamorphic units of northern Apennines (Italy): Insights from mylonitic marbles in the Porto Azzurro pluton contact aureole (Elba Island)

An Estimate of Ice Wedge Volume for a High Arctic Polar Desert Environment, Fosheim Peninsula, Ellesmere Island

Igneous Rock Associations 17. Advances in the Textural Quantification of Crystalline Rocks

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