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Castonguay S.,Commission geologique du Canada | Dietrich J.,Geological Survey of Canada | Lavoie D.,Commission geologique du Canada | Laliberte J.-Y.,Ministere des Ressources naturelles et de la Faune du Quebec
Bulletin of Canadian Petroleum Geology | Year: 2010

This study presents the results of the reprocessing and geological reinterpretation of a trio of regional seismic reflection lines acquired by the Ministère des Ressources naturelles du Québec in 1978. The three profiles (M-2001, M-2002 and M-2003), which represent 280 km of data, cross the Chambly-Fortierville syncline and provide images of the St. Lawrence Platform and the Appalachian foreland thrust belt of southern Quebec. Profile M-2001, the longest profile, extends across the full width of the southern Quebec Appalachians. Post-stack seismic data processing has improved the quality of the original seismic sections by enhancing coherent reflection events and attenuating reflection noise. Time migration further improved the seismic data. The seismic interpretations provide new information on subsurface geology, including the recognition of complex structural patterns in platform and foreland units, the presence of a triangle zone at the structural front, and the geometry of thrust slices of platform units and Appalachian thrust nappes. The M-2001 line also provides images of the internal Humber Zone, including back-thrust faults on the flanks of Notre Dame Mountains Anticlinorium and mega thrust wedges, possibly involving Grenvillian basement, within the core of the anticlinorium. In southern Quebec, six conventional petroleum plays, plus shale gas potential, are recognized in the St. Lawrence Platform and Appalachian Foreland. From these, the Saint-Flavien field (161 million m3 of past natural gas production) and other potential targets are imaged by the three seismic profiles studied. The reprocessing and reinterpretation of these seismic reflection profiles provide new insights into the structure, geological evolution and petroleum potential of the St. Lawrence Platform and the Appalachian foreland thrust belt of southern Quebec. © 2010 by the Canadian Society of Petroleum Geologists.


Dufrechou G.,INRS - Institute National de la Recherche Scientifique | Harris L.B.,INRS - Institute National de la Recherche Scientifique | Corriveau L.,Commission geologique du Canada | Antonoff V.,INRS - Institute National de la Recherche Scientifique
Journal of Applied Geophysics | Year: 2015

The Bondy gneiss complex in the Grenville Province of Southwest Quebec hosts a mineralized iron oxide- and copper-rich hydrothermal system. The northern part of the complex overlies the lithospheric-scale Mont-Laurier lineament and is cut by the regional Mont-Laurier South shear zone interpreted from Bouguer gravity. A sinistral 6. km wide strike-slip corridor defined by several second-order shears (the Mont-Laurier South shear zone) in the complex was identified from geophysical data, including a new high-resolution airborne magnetic survey, and field observations. The spatial association of a metamorphosed alteration system, several pre- to post-metamorphic mineralized zones and mafic intrusions within the Mont-Laurier South shear zone suggests that (i) underlying basement structures controlled hydrothermal fluid migration during the formation of epithermal-IOCG mineralization and associated alteration system before ca. 1.2. Ga high-grade metamorphism and penetrative ductile deformation in the complex; (ii) post-metamorphic reactivation allowed magma ascent and pluton emplacement in the complex and adjacent supracrustal rocks within dilatational sites; and (iii) brittle-ductile shears that postdate high-grade metamorphism provided channel ways for fluid migration associated with magnetite-related mineralization. Although the complex does not host an economic mineral deposit, the role between structures at different levels and the combination of gravity and aeromagnetics at different scales provides an example of an approach for mineral exploration in similar high grade gneiss terrains. © 2015 Elsevier B.V.


Dufrechou G.,INRS - Institute National de la Recherche Scientifique | Harris L.B.,INRS - Institute National de la Recherche Scientifique | Corriveau L.,Commission geologique du Canada
Precambrian Research | Year: 2014

NW-SE trending, transverse lineaments, including the lithospheric-scale Mont-Laurier lineament, are interpreted from regional Bouguer gravity of the Grenville orogen of SW Quebec and adjacent Superior Craton in southeastern Canada. These lineaments, transverse to the ENE trending Grenville orogen, are inferred to correspond to Palaeoproterozoic structures in Archaean basement that have played an important role: (i) in the development of volcano-sedimentary back-arc basins along this segment of the Laurentian margin; (ii) on the geometry of thrust sheets and folds formed during thrusting in the ca. 1.23-1.2. Ga Elzevirian orogeny and incorporation of the basins within the orogen; (iii) on reorientation of early-formed structures in the Central Metasedimentary Belt of Quebec (CMB-Q) during ca. 1.19-1.17. Ga post-Elzevirian orogenic collapse; and (iv) for development of syn-plutonic deformation corridors and shear zones at the onset of the emplacement of the Morin anorthosite-mangerite-charnockite-granite (AMCG) suite. In the CMB-Q, a 100. km wide megakink zone developed during ca. 1.19-1.17. Ga differential, post-Elzevirian orogenic collapse in the upper-most nappe above transverse sinistral shear corridors 10-20. km wide located in an underlying thrust sheet or "lower-deck". Emplacement of 1.17. Ga Chevreuil intrusive suite preferentially occurred within the megakink zone, starting late in the post-Elzevirian collapse and culminating during a switch to local shortening early in (and in part as a consequence of) the emplacement of the voluminous Morin anorthosite and associated AMCG-suite plutons. The Labelle deformation zone separating the CMB-Q and Morin terrane is interpreted as a post-Shawinigan, reverse shear zone that truncates folded lithological layering in the eastern CMB-Q and western Morin terrane that is either subsequently folded above the Mont-Laurier lineament during its further reactivation, or developed as a curved shear zone stepping across the Mont-Laurier lineament. The Grenville Province of SW Quebec therefore provides an example of strain partitioning and distinct deformation responses at different crustal levels during reactivation of basement structures. © 2013 Elsevier B.V.


Tremblay L.,University of Quebec at Montréal | Larocque M.,University of Quebec at Montréal | Anctil F.,Laval University | Rivard C.,Commission geologique du Canada
Journal of Hydrology | Year: 2011

Relatively little is known about the impact of climate change on groundwater. The analysis of large-scale climatic patterns such as the well-known El Niño Southern Oscillation Index could provide a better comprehension of the causes of recharge variations in aquifers and therefore improve the knowledge related to processes behind the variability of groundwater level time series. This topic has been studied to a limited extent in other parts of the world, but no study has yet used this approach across Canada. In this work, correlation and wavelet analyses and wavelet coherence are used to gain a broader understanding of the interannual dynamics of recharge through the use of groundwater level records in three Canadian regions, namely Prince Edward Island (PEI), southern Manitoba in the vicinity of Winnipeg (MB) and Vancouver Island (VI). Cause and effect linkages between four climatic indices (the North Atlantic Oscillation (NAO), the Arctic Oscillation (AO), the Pacific-North American pattern (PNA) and the El Niño Southern Oscillation represented by the Multivariate ENSO Index (MEI)), groundwater level time series, as well as precipitation and temperature time series are investigated. The length of the available historical records of groundwater levels at the three sites is 32 years (1974-2005). The three Canadian regions studied show drastically different patterns of variability evolution for the hydrogeological records. Groundwater level variability on PEI is mostly influenced by the NAO and the AO. The variability of groundwater levels in the MB region is partly explained by PNA. In the VI region, NAO, AO and MEI appear to impact the pattern of groundwater variability. © 2011 Elsevier B.V.


Lamontagne C.,Ministere du Developpement Durable de lEnvironnement | Nastev M.,Commission Geologique du Canada
Canadian Water Resources Journal | Year: 2010

This regional hydrogeological study of the Chateauguay River watershed was undertaken during a four-year period, between 2003 and 2007, and required the involvement of several multidisciplinary groups. The rationale for the study was the lack of knowledge on the state of the groundwater resource, which hindered management efforts in the watershed. The project objective was to define the major aquifer units and the quality and quantity of the groundwater resources. The applied methodology consisted of compiling existing data and generating a digital database, acquiring new eld data, and updating geological maps, followed by determining the hydrodynamic and hydrogeochemical processes, and assessing the sustainability The regional aquifer units are comprised of sedimentary bedrock formations and occasional coarse fluvioglacial sediments. The nature and thickness of the surficial deposits defines the hydrogeological settings and flow regimes. © 2010 Canadian Water Resources Association.


Dietrich J.,Geological Survey of Canada | Lavoie D.,Commission geologique du Canada | Hannigan P.,Geological Survey of Canada | Pinet N.,Commission geologique du Canada | And 3 more authors.
Bulletin of Canadian Petroleum Geology | Year: 2011

The Paleozoic sedimentary successions in eastern Canada occur in four major tectonostratigraphic domains: the Lower-Middle Paleozoic autochthonous St. Lawrence Platform, extending from southern Quebec to western Newfoundland; the deformed Lower Paleozoic Humber Zone of the Appalachian orogen, located south and east of the St. Lawrence Platform; the Middle Paleozoic Gaspé Belt in eastern Quebec and northern New Brunswick; and the Upper Paleozoic Maritimes Basin in the Gulf of St. Lawrence and environs. Discovered oil and gas fields occur in Ordovician strata in the St. Lawrence Platform and external Humber Zone, Devonian strata in the northeastern Gaspé Belt, and Carboniferous strata in the Maritimes Basin. Fifteen conventional petroleum plays are recognized in Paleozoic strata in eastern Canada. Six plays have sufficient exploration data to derive quantitative assessments of petroleum resource potential. The assessed plays include Lower Ordovician and Middle-Upper Ordovician hydrothermal dolomite plays in the St. Lawrence Platform, an Ordovician carbonate thrust-slice play in the external Humber Zone, a Lower Devonian sandstone play in the Gaspé Belt, and Mississippian and Upper Mississippian-Pennsylvanian sandstone plays in the Maritimes Basin. The cumulative median resource potential of the six assessed plays is 403 106m3 (2.5 billion barrels) of in-place oil and 1170 109m3 (41 Tcf) of in-place natural gas. The Maritimes Basin plays account for about 60% and 95% of the total oil and gas resource potential, respectively. The Upper Mississippian-Pennsylvanian sandstone play contains the largest predicted oil and gas fields in the region, with median volume estimates of 22.5 106m3 (141 million barrels) of in-place oil and 74 109m3 (2.6 Tcf) of in-place gas. The assessment study provides important new insights into the petroleum resource endowment of Paleozoic basins in eastern Canada. In particular, the results indicate the Upper Paleozoic Maritimes Basin has a large conventional gas resource potential, much higher than previously estimated. The petroleum resource numbers represent a minimum for the region, because not all of the conventional plays were quantitatively assessed. The resource potential in the Cambrian-Devonian sedimentary successions may be much higher than indicated here.

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