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
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Published:2021-05-19
Issue:5
Volume:12
Page:1143-1164
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ISSN:1869-9529
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Container-title:Solid Earth
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language:en
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Short-container-title:Solid Earth
Author:
Cheraghi Saeid, Malehmir AlirezaORCID, Naghizadeh Mostafa, Snyder DavidORCID, Mathieu Lucie, Bedeaux Pierre
Abstract
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 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.
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Earth-Surface Processes,Geochemistry and Petrology,Geology,Geophysics,Soil Science
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