Fracture mapping of lineaments and recognizing their tectonic significance using SPOT-5 satellite data: A case study from the Bajestan area, Lut Block, east of Iran

Ahmadirouhani, Reyhaneh; Rahimi, Behnam; Karimpour, Mohammad Hassan; Shafaroudi, Azadeh Malekzadeh; Najafi, Sadegh Afshar; Pour, Amin Beiranvand

doi:10.1016/j.jafrearsci.2017.07.027

Cited by 23 publications

(6 citation statements)

References 46 publications

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“…In this sense, the mapping of structures directly in the field is conducive to the correct discrimination of the different fabric elements, either planar or linear, in addition to their measurement (either by using analog compasses or mobile devices) and visualization. When regional surveys are undertaken using analog compasses or mobile devices, the visualization of the data directly in the outcrop is fundamental for differentiating structural domains, validating tectonic drag directions, paleocurrent directions and structural trends, among others (Potter and Pettijohn, 1963;Nemec, 1988;Hatcher, 1995;Gabrielsen and Braathen, 2014;Abdunaser, 2015;Ahmadirouhani et al, 2017;Han et al, 2018;Rajasekhar et al, 2018). Considering that it is vital to know the arrangement of geological structures in an area by outcrop or station, the methodological implementation of the modified stereographic network approach presented herein constitutes a practical and innovative solution for the graphical representation of structural data when mapping in areas with broken, canyoned, or difficult to access topography, where there is no signal for the use of mobile devices to generate stereograms directly using apps.…”

Section: Discussionmentioning

confidence: 99%

Graphical representation of structural data in the field: A methodological proposal for application in deformed areas

Isaza¹,

Cárdenas²,

Cetina³

et al. 2021

Bol.geol.

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The description of the fabric elements represented by the linear and planar structures present at different scales is a key component of fieldwork. A scheme is proposed for the systematic registration of planes and lineations, coded as S (planar surfaces), F (folds), and L (lineations), among others, that allows for the orderly storage of the measurements taken. This scheme includes information related to the kinematics, the kinematic indicators, and the certainty or reliability ascribed to the assigned movement. In the fieldwork, the graphic representation of the structural measures in modified projection nets includes concentric circles for each dip. Direct drawing of the outcrop data is undertaken, dispensing with the use of tracing or transparent paper. The stereograms resulting from the graphic representation in the modified Wulff stereographic projection net, and the modified Schmidt equal-area net, can be complemented by rose diagrams for visualization of the spatial ordering. During field campaigns in the outcrops, it is essential to visualize the spatial orientation of the data in the diagrams to determine the main structural trends, the vergence, the kinematic nature of faults and shear zones, paleo-stress tensors, and to differentiate structural domains, among others. This information supports the reconstruction of geological and tectonic history and the establishment of relationships between the different geological processes.

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Section: Discussionmentioning

confidence: 99%

Graphical representation of structural data in the field: A methodological proposal for application in deformed areas

Isaza¹,

Cárdenas²,

Cetina³

et al. 2021

Bol.geol.

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“…Principal Component Analysis (PCA) is an efficient technique broadly used for geological mapping (Adiri et al, 2018(Adiri et al, , 2016Amer et al, 2012;Gad & Kusky, 2007;Pour & Hashim, 2011, 2012Si Mhamdi et al, 2016. This method consists of defining the new bands (Principal Components (PCs)) which sum up the information contained in several bands in a multispectral space (Ahmad Irouhani et al, 2017;Dembele & Xiufen Ye, 2017;El Alaoui El Moujahid et al, 2016;Estornell et al, 2013;Franchi et al, 2016). Sometimes the information filed in 5 or 6 bands is condensed into two or three components by this analysis (Si Mhamdi et al, 2017).…”

Section: The Principal Component Analysismentioning

confidence: 99%

Mapeo de redes de fracturas mediante imágenes Landsat-8 OLI en la zona minera de Jbel Tijekht en el Anti-Atlas oriental de Marruecos

Saidi¹,

Mhamdi

Essalhi³

et al. 2020

estudgeol

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El Jbel Tijekht es una de las estructuras geológicas más importantes de la cordillera de Ougnat-Ouzina en el Anti-Atlas Oriental. Este macizo en forma de media luna fue afectado por una red de fracturas que es visible a diferentes escalas. Es particularmente rico en vetas mineralizadas de barita y está asociado con otros minerales (por ejemplo, pirita, calcopirita, esfalerita y galena). Para estudiar los sistemas de fracturas en la zona minera de Jbel Tijekht, optamos por una combinación de teledetección e investigación de campo que se convirtió en una importante herramienta para la cartografía de las fracturas y la exploración de minerales. Este trabajo presenta un enfoque metodológico para detectar los lineamientos estructurales. Para ello, se aplicaron diversas técnicas a la imagen del Landsat 8 para mejorar la visibilidad de las estructuras lineales. Tras correcciones radiométricas y atmosféricas, los colores compuestos y los filtros direccionales aplicados al componente principal (PC1) se pudo establecer un mapa de lineamientos para Jbel Tijekht. La validación y corrección de estos lineamientos se basan en documentos preexistentes combinados con observaciones de campo. El análisis estadístico del mapa de lineamientos permite la identificación de al menos tres sistemas de fractura direccional con orientaciones promedio NS, NE-SW y ENE-WSW. Los sistemas NS y NE-SW muestran una alta densidad en la mayor parte del área de estudio. Estos resultados claramente se superponen a diferentes estructuras tectónicas y a las vetas existentes. Esto permitió establecer un vínculo geológico entre la litología, los sistemas de fracturas y la mineralización. La densidad de fracturas puede atribuirse a las últimas fases de fragilidad del orógeno varisco, lo que refleja la reología de las unidades de roca; la alta densidad de fractura se observa en las rocas competentes como las areniscas de Tabanit. Estas zonas constituyen un área favorable para los depósitos de mineralización.

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“…There have been a large number of studies that have demonstrated the potential of SWIR and thermal remote sensing data to map the highest grade alteration associated and thus mineral prospectivity associated with epithermal deposits [1,[8][9][10][11][12][13][14][15][16][17][59][60][61]. A significant limitation has been the spatial resolution of the only widely available multi-spectral thermal wave range sensor, ASTER, which with a 90 × 90 m 2 pixel covers an area of 8100 m 2 .…”

Section: Utility Of High Spatial and Spectral Remote Sensing Based Hymentioning

confidence: 99%

“…The identification of these geomorphological features in the field is hampered by the large spatial scale, inaccessible terrain and most significantly because of erosion and tectonism which significantly reduces the amount and clarity of surface expressions of these features [6,7]. Remote sensing methodologies offer the potential of accurately mapping the diagnostic mineralogical assemblages of the alteration minerals associated with epithermal deposits at landscape scales [8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Prospectivity Mapping for Epithermal Deposits of Western Milos Using a Fuzzy Multi Criteria Evaluation Approach Parameterized by Airborne Hyperspectral Remote Sensing Data

et al. 2019

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A Mineral prospectivity mapping (MPM) approach using a GIS-based weighted linear combination implementation of a Multi-Criteria Evaluation approach utilising a fuzzy Analytical Hierarchy Process to elucidate expert knowledge has been implemented to analyse the spatial distribution of epithermal deposits on the Island of Milos, Greece and model their association with exploration evidence data with the aim of providing insights into the controls on ore deposition. An integrated field and Digital Airborne Imaging Spectrometer (DAIS) hyperspectral and thermal multispectral airborne remote sensing dataset supported by field mapping and laboratory analyses, has been utilised to resolve hydrothermal alteration and parameterise the MPM. This study has highlighted the intimate spatial relationship between topographic highs and locations with high grade silicified alteration at a number of locations. The ability of high spatial resolution multispectral Thermal InfraRed (TIR) remote sensing imagery, integrated with topographic data, to resolve these silicified topographic highs provides an additional tool in the exploration of epithermal deposits. The spatial relationships between silicified lithocaps, high-grade altered rocks, faulting and topographic highs were utilised in the development of the MPM model. A close association between the modelled results and the hydrothermal alteration mapped in the field supports the accuracy of this MPM approach.

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Fracture mapping of lineaments and recognizing their tectonic significance using SPOT-5 satellite data: A case study from the Bajestan area, Lut Block, east of Iran

Cited by 23 publications

References 46 publications

Graphical representation of structural data in the field: A methodological proposal for application in deformed areas

Graphical representation of structural data in the field: A methodological proposal for application in deformed areas

Mapeo de redes de fracturas mediante imágenes Landsat-8 OLI en la zona minera de Jbel Tijekht en el Anti-Atlas oriental de Marruecos

Prospectivity Mapping for Epithermal Deposits of Western Milos Using a Fuzzy Multi Criteria Evaluation Approach Parameterized by Airborne Hyperspectral Remote Sensing Data

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