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Active and passive seismic imaging of the central Abitibi greenstone belt, Larder Lake, Ontario
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  • Mostafa Naghizadeh,
  • Richard Stuart Smith,
  • Ross Sherlock,
  • Kate Rubingh,
  • Bruno Lafrance,
  • John A Ayer,
  • Saeid Cheraghi,
  • David B Snyder,
  • Jérôme Vergne,
  • Aurelien Mordret,
  • Daniel Hollis
Mostafa Naghizadeh
Laurentian University

Corresponding Author:[email protected]

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Richard Stuart Smith
Laurentian University
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Ross Sherlock
Laurentian University
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Kate Rubingh
Laurentian University
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Bruno Lafrance
Laurentian University
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John A Ayer
Harquail School of Earth Sciences, Laurentian University
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Saeid Cheraghi
Laurentian University
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David B Snyder
Laurentian University
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Jérôme Vergne
EOST
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Aurelien Mordret
ISTerre - UGA
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Daniel Hollis
Sisprobe
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Abstract

Passive seismic methods are considered as cost-effective and environmental-friendly alternatives to active (reflection) seismic methods. We have acquired co-located active and passive seismic surveys over a metal-endowed Archean granite-greenstone terrane in the Larder Lake area to investigate the reliability of the estimated elastic properties using the passive seismic methods. The passive seismic data was processed using two different data processing approaches, the ambient noise surface wave tomography (ANSWT) and receiver function analysis methods to generate shear-wave velocity and P- to S-wave (P-S) convertibility profiles of the subsurface, respectively. The Cadillac-Larder Lake Fault (CLLF) was imaged as a south-dipping sub-vertical zone of weak reflectivity in the reflection seismic profile. To the north of the CLLF, a package of north-dipping reflections in the upper-crust (at depths of 5-10 km) resides on the boundary of high (on the top) and low (on the bottom) shear-wave velocity zones estimated using the ANSWT method. This package of reflections is most likely caused by overlaying mafic volcanic and underlying felsic intrusive rocks. The P-S convertibility profile imaged the Moho boundary at ~40 km depth as well as a south-dipping slab that penetrates into the mantel which was interpreted to be either caused by the delamination of the lower crust or a possible deeper extension of the Porcupine-Destor Fault. Overall, the reflectivity, shear-wave velocity, and P-S convertibility profiles exhibited a good correlation and provided a detailed image of the subsurface lithological structure to a depth of 10 km.
Feb 2022Published in Journal of Geophysical Research: Solid Earth volume 127 issue 2. 10.1029/2021JB022334