Synthesis of the structural evolution and associated gold mineralization of the Cadillac Fault, Abitibi, Canada

Bedeaux, Pierre; Pilote, Pierre; Rafini, Silvain

doi:10.1016/j.oregeorev.2016.11.029

Cited by 50 publications

(45 citation statements)

References 79 publications

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“…In the Lapa area, schistosity is E-W oriented, dipping steeply to the north, parallel to bedding. A three-step evolution includes the thrusting of the greenstone belt onto the Pontiac Subprovince, a late extensional episode contemporaneous with the formation of the Timiskaming basins (2677-2673 Ma), followed by late dextral shearing with gold mineralization around 2665 Ma (Bedeaux, Pilote, Daigneault, & Rafini, 2017;Robert, 1989).…”

Section: The Lapa Gold Depositmentioning

confidence: 99%

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

et al. 2017

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Antimony‐rich gold deposits represent a subclass of orogenic hydrothermal systems. The study of the Lapa gold deposit in the Abitibi greenstone belt shows that antimony occurs during two different stages: (1) as early prograde Sb–Ni disseminated sulphides in talc schists, associated with CO2‐bearing fluids, and (2) as a late native antimony association, associated with methane‐bearing fluids indicating a reducing environment. Methane could be related to the serpentinization of the ultramafic rocks of the Piché Group hosting the Lapa deposit. Several deposits display the same methane antimony association along fault zones.

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Section: The Lapa Gold Depositmentioning

confidence: 99%

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

et al. 2017

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“…The a-b plane of the Late Diorite plugs (Fig. 6d) defines a planar orientation subparallel to S 2 (77°→ 004°) developed in the Jacola and Val-d'Or Formations, which has reported dips ranging from 70°to 90°, and dip-azimuth ranges from N-S to NNE-SSW (Claoué-Long et al 1990;Morasse et al 1995;Scott et al 2002;Bedeaux et al 2017).…”

Section: Synthesismentioning

confidence: 96%

“…The city of Val-d'Or is located at 48.098709°, − 77.796768°and UTM Zone 18U steep northerly dipping high-strain suture between the two subprovinces and is one of the greatest gold belts on Earth with a current Resource of about 130 million ounces of gold (Rafini 2014). The geology of the Val-d'Or district has been described in detail by previous workers and their articles contain a more complete discussion of the regional geology (Robert 1989;Desrochers and Hubert 1996;Scott et al 2002;Olivo et al 2006;Bedeaux et al 2017). This section only summarizes the geology relevant to the discussion of the deposit-scale controls of Sigma-Lamaque gold mineralization.…”

Section: Geological Settingmentioning

confidence: 99%

“…The level of ductile strain, reflected in the S 2 intensity, increases southward towards the Cadillac tectonic zone (Robert 1989). The main schistosity in the study area is labeled as S 2 and follows the convention adopted in the literature published prior to Bedeaux et al (2017).…”

Section: Structural Architecture At Multiple Scalesmentioning

confidence: 99%

“…However, the literature indicates that S 2 has an approximate dip-azimuth range of 000°to 015°and a dip range of 70°to 90° (Morasse et al 1995;Scott et al 2002;Bedeaux et al 2017), making it axial planar to the La Motte Anticline. & The bedding readings in the Val-d'Or Formation vary, dipping steeply south as well as being overturned and dipping north; this is consistent with an overturned southern limb of the La Motte Anticline (Fig.…”

Section: Regional-scale Observationsmentioning

confidence: 99%

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Deposit-scale structural architecture of the Sigma-Lamaque gold deposit, Canada—insights from a newly proposed 3D method for assessing structural controls from drill hole data

Cowan

2020

Miner Deposita

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Deposit-scale structural analysis is a practical method of structurally analyzing 3D drilling data. This interpretation method uses readily available distributed 3D data at the most relevant scale for mining and exploration. This method does not depend on collecting traditional structural data from core, such as orientation of planar and linear data, but relies on the premise that grade distributions sampled from drilling provide insight into the structural control of the deposit, with the interpretation of structural geometry done using a computer 3D viewer. This method is applied to the well-studied Archean Sigma-Lamaque gold deposit, which features late-orogenic vein mineralization, and which is controlled by three orders of structural features. The first-order control is the easterly plunging pipe-like conduit parallel to F 2 fold plunge defined by the intersection of bedding (S 0 ) and foliation (S 2 ) (~1.5 km radius × 3 km down-plunge). The second-order controls, nested within the first-order, are the younger subvertical Late Diorite plugs that intruded vertically into the host rocks along the established S 2 foliation anisotropy (1250:400:150 m dimension for Main Plug). The third-order control, laterally limited by first-and second-order structural controls, is the well-documented goldbearing vein sets (1-10 m thick and up to 1.5 km in extent) that developed in the Late Diorites and in the older folded volcanogenic stratigraphy and diorites. It is proposed that the first-order control defined by the moderately plunging F 2 fold is the main fluid pathway resulting from structural permeability formed during earlier folding. The second-order Late Diorite plugs and other competent lithological units, which intersected and fractured during late-stage D 2 compression, served as chemically reactive sites causing gold to precipitate along this first-order pathway. It is predicted that intrusions that do not intersect the first-order structural conduits are less likely to be mineralized. Greenfield orogenicgold exploration requires that the first-order controls are identified, and the geometry of hydrothermal alteration is best understood in the context of the structural architecture of the host rocks.

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Expanding the size of multi-parameter metasomatic footprints in gold exploration: utilization of mafic dykes in the Canadian Malartic district, Québec, Canada

et al. 2018

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Synthesis of the structural evolution and associated gold mineralization of the Cadillac Fault, Abitibi, Canada

Cited by 50 publications

References 79 publications

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

Native antimony emplaced by methane‐rich hydrothermal fluid in an orogenic fault‐zone

Deposit-scale structural architecture of the Sigma-Lamaque gold deposit, Canada—insights from a newly proposed 3D method for assessing structural controls from drill hole data

Expanding the size of multi-parameter metasomatic footprints in gold exploration: utilization of mafic dykes in the Canadian Malartic district, Québec, Canada

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