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| Title: | Tracing along-strike structural continuity of the Neoproterozoic Allaqi-Heiani Suture, southern Egypt using principal component analysis (PCA), fast Fourier transform (FFT) and redundant wavelet transform (RWT) of ASTER data |
| Author (s): | Ren, Dianwei Abdel Salam, Mohamed G. |
| Department/Lab Affiliations: | Geological Sciences & Engineering |
| Keywords: | FFT Neoproterozoic Allaqi Suture PCA RWT redundant wavelet transform |
| Subject Terms: | ASTER (Computer file) Fourier transformations. Principal components analysis. |
| Issue Date: | 2006 |
| Publisher: | Elsevier |
| Citation: | Ren, Dianwei and Mohamed G. Abdelsalam. “Tracing Along-strike Structural Continuity of the Neoproterozoic Allaqi-Heiani Suture, Southern Egypt Using Principal Component Analysis (PCA), Fast Fourier Transform (FFT) and Redundant Wavelet Transform (RWT) of ASTER Data.” Journal of African Earth Sciences, vol. 44, no. 2, 2006, pp. 181-195. |
| Abstract: | We have used the visible and near infrared (VNIR) and short wave infrared (SWIR) bands of the advanced space-borne thermal emission and reflectance radiometer (ASTER) to trace along-strike structures in the ophiolite-decorated Neoproterozoic Allaqi-Heiani Suture in southern Egypt. The suture is E-trending in the west, changes to N-trending in its central part, and E-trending further east. The western part of the suture is defined by a fold and thrust belt dominated by an autochthon in the south followed by a southern, central and northern allochthons that were emplaced top-to-the-south. Tracing along-strike structures in the Allaqi-Heiani Suture has been a challenging task due to structural complexity and change of structural style. Principal component analysis (PCA), fast Fourier transform (FFT), and redundant wavelet transform (RWT) are used to identify ophiolite components such as talc carbonate schist, gabbro, and serpentinite as well as Neoproterozoic ductile structures to trace along-strike continuation in the Allaqi-Heiani Suture. (1) The PCA is performed on the 9 × 9 covariance matrix of the ASTER VNIR and SWIR bands. PC5 is selected because the ophiolite components and the Neoproterozoic ductile structures are best emphasized. (2) The FFT is performed on PC5 to reduce noises and mosaicking boundaries of the ASTER scenes. (3) The RWT is performed to enhance the contrast between ophiolite components and the surrounding rock types. This work helped in tracing structures along the Allaqi-Heiani Suture and revealed structural features that have not been identified before: (1) Some folds associated with the S-verging fold and thrust belts are periclinal folds that might be associated with nappe emplacement. (2) Truncation of structures associated with the S-verging fold and thrust belts occurs along NNW-trending sinistral strike-slip shear zones that swing at their extreme ends to become parallel to the truncated structures. (3) Presence of N-trending folds close to the NNW-trending sinistral strike-slip shear zones. (4) Presence of N- and NE-trending brittle faults younger than the Neoproterozoic ductile structures. Nappes identified in the west are traced into the central part of the suture allowing for subsequent modification by younger structures. The difference in structural styles along the suture might be due to development of frontal and lateral ramps along the traces of the orogen front. This was followed by superimposition of E–W shortening to produce N-trending folds that are localized close to the lateral ramps. Subsequently, N- and NE-trending brittle faults were developed and deformed early Neoproterozoic ductile structures. |
| Type: | Article - Journal text |
| In Title: | Journal of African Earth Sciences |
| Copyright Notice: | Pre-print: author can archive with restrictions;Restriction: This does not include Cell Press; Post-print: author can archive; This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. FULL COPYRIGHT INFORMATION: |
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| title | Tracing along-strike structural continuity of the Neoproterozoic Allaqi-Heiani Suture, southern Egypt using principal component analysis (PCA), fast Fourier transform (FFT) and redundant wavelet transform (RWT) of ASTER data |
| contributor.author | Ren, Dianwei |
| contributor.author | Abdel Salam, Mohamed G. |
| contributor.deptlab | Geological Sciences & Engineering |
| contributor.sponsor | Jet Propulsion Lab |
| contributor.sponsor | National Aeronautics and Space Administration |
| contributor.sponsor | National Science Foundation |
| subject | FFT |
| subject | Neoproterozoic Allaqi Suture |
| subject | PCA |
| subject | RWT |
| subject | redundant wavelet transform |
| subject.LCSH | ASTER (Computer file) |
| subject.LCSH | Fourier transformations. |
| subject.LCSH | Principal components analysis. |
| date.issued | 2006 |
| publisher | Elsevier |
| identifier.citation | Ren, Dianwei and Mohamed G. Abdelsalam. “Tracing Along-strike Structural Continuity of the Neoproterozoic Allaqi-Heiani Suture, Southern Egypt Using Principal Component Analysis (PCA), Fast Fourier Transform (FFT) and Redundant Wavelet Transform (RWT) of ASTER Data.” Journal of African Earth Sciences, vol. 44, no. 2, 2006, pp. 181-195. |
| identifier.pub.URI | |
| description.abstract | We have used the visible and near infrared (VNIR) and short wave infrared (SWIR) bands of the advanced space-borne thermal emission and reflectance radiometer (ASTER) to trace along-strike structures in the ophiolite-decorated Neoproterozoic Allaqi-Heiani Suture in southern Egypt. The suture is E-trending in the west, changes to N-trending in its central part, and E-trending further east. The western part of the suture is defined by a fold and thrust belt dominated by an autochthon in the south followed by a southern, central and northern allochthons that were emplaced top-to-the-south. Tracing along-strike structures in the Allaqi-Heiani Suture has been a challenging task due to structural complexity and change of structural style. Principal component analysis (PCA), fast Fourier transform (FFT), and redundant wavelet transform (RWT) are used to identify ophiolite components such as talc carbonate schist, gabbro, and serpentinite as well as Neoproterozoic ductile structures to trace along-strike continuation in the Allaqi-Heiani Suture. (1) The PCA is performed on the 9 × 9 covariance matrix of the ASTER VNIR and SWIR bands. PC5 is selected because the ophiolite components and the Neoproterozoic ductile structures are best emphasized. (2) The FFT is performed on PC5 to reduce noises and mosaicking boundaries of the ASTER scenes. (3) The RWT is performed to enhance the contrast between ophiolite components and the surrounding rock types. This work helped in tracing structures along the Allaqi-Heiani Suture and revealed structural features that have not been identified before: (1) Some folds associated with the S-verging fold and thrust belts are periclinal folds that might be associated with nappe emplacement. (2) Truncation of structures associated with the S-verging fold and thrust belts occurs along NNW-trending sinistral strike-slip shear zones that swing at their extreme ends to become parallel to the truncated structures. (3) Presence of N-trending folds close to the NNW-trending sinistral strike-slip shear zones. (4) Presence of N- and NE-trending brittle faults younger than the Neoproterozoic ductile structures. Nappes identified in the west are traced into the central part of the suture allowing for subsequent modification by younger structures. The difference in structural styles along the suture might be due to development of frontal and lateral ramps along the traces of the orogen front. This was followed by superimposition of E–W shortening to produce N-trending folds that are localized close to the lateral ramps. Subsequently, N- and NE-trending brittle faults were developed and deformed early Neoproterozoic ductile structures. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Postprint |
| rights | Pre-print: author can archive with restrictions;Restriction: This does not include Cell Press; Post-print: author can archive; |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights.URI | |
| relation.isPartOf | Journal of African Earth Sciences |
| date.available | 2008-07-25T19:02:47Z |
| identifier.persist.URI |