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
<p>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 volcanically hosted massive sulfide (VMS) deposits and hydrothermal Cu–Au mineralization found there. Major faults...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-05-01
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| Series: | Solid Earth |
| Online Access: | https://se.copernicus.org/articles/12/1143/2021/se-12-1143-2021.pdf |
| _version_ | 1818459266460155904 |
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| author | S. Cheraghi A. Malehmir M. Naghizadeh D. Snyder L. Mathieu P. Bedeaux |
| author_facet | S. Cheraghi A. Malehmir M. Naghizadeh D. Snyder L. Mathieu P. Bedeaux |
| author_sort | S. Cheraghi |
| collection | DOAJ |
| description | <p>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 volcanically 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 a known metal
endowment in the area. Common-offset DMO corrections and common-offset
pre-stack time migrations (PSTMs) were considered. Irregularities of the
trace midpoint distribution resulting from the crooked geometry of both
profiles and their relative contribution to the DMO and PSTM methods 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
northern seismic reflection section, the key geological structures
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.</p> |
| first_indexed | 2024-12-14T23:11:37Z |
| format | Article |
| id | doaj.art-82c344fba2a1487c97fecef72ba96518 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-14T23:11:37Z |
| publishDate | 2021-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-82c344fba2a1487c97fecef72ba965182022-12-21T22:44:11ZengCopernicus PublicationsSolid Earth1869-95101869-95292021-05-01121143116410.5194/se-12-1143-2021Seismic imaging across fault systems in the Abitibi greenstone belt – an analysis of pre- and post-stack migration approaches in the Chibougamau area, Quebec, CanadaS. Cheraghi0A. Malehmir1M. Naghizadeh2D. Snyder3L. Mathieu4P. Bedeaux5Mineral Exploration Research Centre, Harquail School of Earth Sciences, Goodman School of Mines, Laurentian University, Sudbury, Ontario, CanadaDepartment of Earth Science, Uppsala University, Uppsala, SwedenMineral Exploration Research Centre, Harquail School of Earth Sciences, Goodman School of Mines, Laurentian University, Sudbury, Ontario, CanadaMineral Exploration Research Centre, Harquail School of Earth Sciences, Goodman School of Mines, Laurentian University, Sudbury, Ontario, CanadaCentre d'études sur les ressources minérales (CERM), Département des Sciences appliquées, Université du Québec à Chicoutimi (UQAC), Chicoutimi, Québec, CanadaCentre d'études sur les ressources minérales (CERM), Département des Sciences appliquées, Université du Québec à Chicoutimi (UQAC), Chicoutimi, Québec, Canada<p>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 volcanically 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 a known metal endowment in the area. Common-offset DMO corrections and common-offset pre-stack time migrations (PSTMs) were considered. Irregularities of the trace midpoint distribution resulting from the crooked geometry of both profiles and their relative contribution to the DMO and PSTM methods 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 northern seismic reflection section, the key geological structures 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.</p>https://se.copernicus.org/articles/12/1143/2021/se-12-1143-2021.pdf |
| spellingShingle | S. Cheraghi A. Malehmir M. Naghizadeh D. Snyder L. Mathieu P. Bedeaux 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 Solid Earth |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| url | https://se.copernicus.org/articles/12/1143/2021/se-12-1143-2021.pdf |
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