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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Sep 2020

30 Sep 2020

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This preprint is currently under review for the journal SE.

Seismic imaging across fault systems in the Abitibi greenstone belt – An analysis of pre- and post-stack migration approaches in the Chibougamau area, Quebec, Canada

Saeid Cheraghi1, Alireza Malehmir2, Mostafa Naghizadeh1, David Snyder1, Lucie Mathieu3, and Pierre Bedeaux3 Saeid Cheraghi et al.
  • 1Mineral Exploration Research Centre, Harquail School of Earth Sciences, Goodman School of Mines, Laurentian University, Sudbury, Ontario
  • 2Department of Earth Science, Uppsala University, Uppsala, Sweden
  • 3Centre d'études sur les ressources minérales (CERM), Département des Sciences appliquées, Université du Québec à Chicoutimi (UQAC), Chicoutimi, Québec

Abstract. Two high-resolution seismic reflection profiles acquired north and south of Chibougamau, located in the northeast of the Abitibi subprovince of Canada help understand historic volcanic-hosted massive sulfide (VMS) deposits and hydrothermal Cu-Au mineralization found there. Major faults crossed by the profiles include the Barlow fault in the north and the Doda fault and the Guercheville fault in the south, all targets of this study that seeks to determine spatial relationships with known metal endowment in the area. Common-offset DMO corrections and common-offset pre-stack time migrations (PSTM) were considered. Irregularities of the trace midpoint distribution resulting from the crooked geometry of both profiles and their relative contribution to DMO and PSTM method and seismic illumination were assessed in the context of the complex subsurface architecture of the area. To scrutinize this contribution, seismic images were generated for offset ranges of 0–9 km using increments of 3 km. Migration of out-of-plane reflections used cross-dip element analysis to accurately estimate the fault dip. The seismic imaging shows the thickening of the upper crustal rocks near the fault zones along both profiles. In the north seismic reflection section, key geological structure identified include the Barlow fault and two diffraction sets imaged within the fault zone that represent potential targets for future exploration. The south seismic reflection section shows rather a complicated geometry of two fault systems. The Guercheville fault observed as a subhorizontal reflector connects to a steeply dipping reflector. The Doda fault dips subvertical in the shallow crust but as a steeply dipping reflection set at depth. Nearby gold showings suggest that these faults may help channel and concentrate mineralizing fluids.

Saeid Cheraghi et al.

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Saeid Cheraghi et al.

Saeid Cheraghi et al.


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Publications Copernicus
Short summary
2D high-resolution seismic profiles are acquired in north and south of the Chibougamau area, Quebec, Canada located at north-east of the Abitibi Greenstone belt. The Chibougamau area mostly includes volcanic rocks and both profiles cross over several fault zones. The seismic method is acquired to image subsurface down to depth of 12 km. The main target of this study is to image major faults and geological formation in connection to those faults to investigate metal endowment in the area.
2D high-resolution seismic profiles are acquired in north and south of the Chibougamau area,...