3D Reconstruction of geological structures based on remote sensing data: example from Anaran anticline, Lurestan province, Zagros fold and thrust belt, Iran.

M. Snidero and A. Amilibia and O. Gratacos and J. A. Muñoz. ( 2009 )
in: Proc. 29th Gocad Meeting, Nancy

Abstract

The present work describes a methodological workflow for the 3D reconstruction of geological surfaces from remote sensing data and regional-scale maps. The methodology has been oriented and applied to the Anaran anticline in the Zagros Fold and Thrust belt mountain front. A consistent 3D environment has been generated by the combined processing of Aster and Spot images with a high resolution digital elevation model. The spectral resolution of the Aster images has been enhanced by the Optimum Index Factor (OIF) technique while the pansharpening process with the SPOT panchromatic images allowed the improving of the spatial resolution. By means of the 3D digital mapping the structural data have been acquired through analysis of mapped geological traces. Structural analysis of dip-data has allowed us to divide the structure in various cylindrical domains. Structural data has been projected along the structure using measured plunge lines orientation, covering areas with little or no information. Once achieved a satisfactory dataset, the dip-domain methodology has been applied in order to obtain the frame of the reconstruction model. Manual editing allowed constrains the obtained surfaces to the mapped geological limits and to the faults surfaces. With the implementation of the Discrete Smooth Interpolation (DSI) algorithm, the final Asmari and Ilam Fms top surfaces have been reconstructed along Anaran. The faults throw and heave, have been modeled and locally readjusted following the gOcad® structural workflow. The reconstructed surfaces clearly show the geometry in different sectors of the structure, as well as the global geometry of the anticline as a fault propagation fold. Principally the presence of a back thrust affecting the back limb in the southern part of the anticline. The crest collapse normal faults and the outcropping main thrust (Mountain Front Fault), in the central part. The transference zone, affected by significant normal faulting and its relationship with the main thrust, as well as the northern NW-SE dome-like anticline closure.

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BibTeX Reference

@INPROCEEDINGS{SnideroGM2009,
    author = { Snidero, M. and Amilibia, A. and Gratacos, O. and Muñoz, J. A. },
     title = { 3D Reconstruction of geological structures based on remote sensing data: example from Anaran anticline, Lurestan province, Zagros fold and thrust belt, Iran. },
 booktitle = { Proc. 29th Gocad Meeting, Nancy },
      year = { 2009 },
  abstract = { The present work describes a methodological workflow for the 3D reconstruction of geological surfaces from remote sensing data and regional-scale maps. The methodology has been oriented and applied to the Anaran anticline in the Zagros Fold and Thrust belt mountain front. A consistent 3D environment has been generated by the combined processing of Aster and Spot images with a high resolution digital elevation model. The spectral resolution of the Aster images has been enhanced by the Optimum Index Factor (OIF) technique while the pansharpening process with the SPOT panchromatic images allowed the improving of the spatial resolution. By means of the 3D digital mapping the structural data have been acquired through analysis of mapped geological traces. Structural analysis of dip-data has allowed us to divide the structure in various cylindrical domains. Structural data has been projected along the structure using measured plunge lines orientation, covering areas with little or no information. Once achieved a satisfactory dataset, the dip-domain methodology has been applied in order to obtain the frame of the reconstruction model. Manual editing allowed constrains the obtained surfaces to the mapped geological limits and to the faults surfaces. With the implementation of the Discrete Smooth Interpolation (DSI) algorithm, the final Asmari and Ilam Fms top surfaces have been reconstructed along Anaran. The faults throw and heave, have been modeled and locally readjusted following the gOcad® structural workflow. The reconstructed surfaces clearly show the geometry in different sectors of the structure, as well as the global geometry of the anticline as a fault propagation fold. Principally the presence of a back thrust affecting the back limb in the southern part of the anticline. The crest collapse normal faults and the outcropping main thrust (Mountain Front Fault), in the central part. The transference zone, affected by significant normal faulting and its relationship with the main thrust, as well as the northern NW-SE dome-like anticline closure. }
}