Revisiting the Appalachian structural front and offshore Anticosti Basin (northern Gulf of St. Lawrence, Canada) by integrating old and new geophysical datasets

Pinet, Nicolas; Keating, Pierre; Lavoie, Denis; Dietrich, Jane S.; Duchesne, Mathieu J.; Brake, V

doi:10.1016/j.marpetgeo.2011.12.004

Cited by 13 publications

(10 citation statements)

References 55 publications

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“…Rocks of the Precambrian basement on the coast north of Anticosti Island, used as an analogue to the Basement thermal unit, are indeed known to have a great variability in heat generation rate, with prospects for uranium mining (Lavallée 2010). Moreover, a magnetic body in the upper Precambrian basement has been identified near well DZ019 (Pinet et al 2012), which can be linked to the higher than expected BHT.…”

Section: D Temperature Distributionmentioning

confidence: 81%

“…The sedimentary basin is 4000 m thick in the south, whereas it is only one kilometer thick to the north (Bédard et al 2014;Castonguay et al 2005;Desrochers et al 2012). Sedimentary succession represents a transition from a passive margin environment to a foreland basin (Chi et al 2010;Desrochers et al 1988;Desrochers et al 2012;Lavoie et al 2005;Long 2007;Pinet et al 2012). The 3D geological model of Bédard et al (2014) divides the sequence into eight sedimentary thermal units, as well as one undifferentiated thermal unit for the entire Precambrian basement of the Grenville Province (Fig.…”

Section: Geological Settingmentioning

confidence: 99%

“…The 3D geological model of Bédard et al (2014) divides the sequence into eight sedimentary thermal units, as well as one undifferentiated thermal unit for the entire Precambrian basement of the Grenville Province (Fig. 2) (Bordet et al 2010;Desrochers et al 1988;Desrochers 2006Desrochers , 2009Desrochers , 2010Desrochers , 2012Lavoie et al 2005;Pinet et al 2012).…”

Section: Geological Settingmentioning

confidence: 99%

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Geothermal resource assessment of remote sedimentary basins with sparse data: lessons learned from Anticosti Island, Canada

et al. 2020

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Anticosti Island is located in the Anticosti sedimentary basin, an Ordovician/Silurian carbonate platform. This platform is mainly composed of limestone and shale with some dolomite and sandstone and reaches up to 5 km depth in the southwest. It overlies a Precambrian basement of the Grenville Province made of magmatic and metamorphic rocks. Like most remote and off-grid regions in Canada, it relies heavily on fossil fuels for energy supplies. An assessment of deep geothermal resources was achieved in this area with the objective of diversifying energy resources to help develop renewable energy for villages deserved by micro-grid systems. Despite sparse and low-quality bottom-hole data (15 wells of 1111 m to 2762 m depth), a 3D temperature model was developed for this sedimentary basin and its underlying Precambrian basement up to 40 km (mantle depth). Quantifying confidence intervals for thermal parameters, namely bottom-hole temperature, thermal conductivity, heat generation rate and mantle heat flux, was paramount to obtain a reliable range of temperature predictions. A high variability of modeled temperature, up to 41% at the base of the sedimentary basin and 70% at mantle depth, remains when trying to constrain input parameters. The lack of equilibrium temperature measurements at depth affects the temperature predictions, both in the sedimentary basin and the Precambrian basement. It is an important issue to solve in further studies. Furthermore, knowledge of the thermal properties of the Precambrian basement of the Grenville Province and its geometry is poor. In addition, there is a wide confidence interval on thermal conductivity of specific lithologies in the Anticosti sedimentary basin. It has a significant impact on temperature predictions at depth and should be improved for studies focusing on electricity production. Despite a wide confidence interval on temperature predictions, geothermal electricity generation from reservoirs at 120 °C or more appears difficult in the current technical and economic context. Electricity generation at a low temperature with an inlet of 70 °C could be achieved at a reservoir depth of 2-4 km, but with a net efficiency of 10-11% (considering a flow rate of 40 l s −1 and a cooling temperature of 5 °C). Direct use of geothermal heat from the deepest part of the sedimentary basin seems to be the most realistic option, provided that sufficiently permeable horizons can be found.

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Section: D Temperature Distributionmentioning

confidence: 81%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Geothermal resource assessment of remote sedimentary basins with sparse data: lessons learned from Anticosti Island, Canada

et al. 2020

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“…Knowledge of the offshore stratigraphy of the Anticosti Basin is based dominantly on geophysical surveys acquired since 1970 (Dietrich et al, 2011;Dumont & Jones, 2013;Lamb, 1976;Pinet et al, 2012;Sanford & Grant, 1990;Sinclair, 1990;Stockmal & Waldron, 1990). Stockmal and Waldron (1990) interpreted a tectonic wedge, of Acadian (Devonian) age Waldron & Stockmal, 1991) at the structural front of the Newfoundland Appalachians using three marine seismic reflection profiles collected by Shell Canada Resources Limited (Lamb, 1976) ( Figure 4d).…”

Section: Methodsmentioning

confidence: 99%

Anticosti foreland basin offshore of western Newfoundland: Concealed record of northern Appalachian orogen development

2019

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The Anticosti Basin, largely hidden beneath the Gulf of St. Lawrence, includes foreland basin successions that record multiple tectonic events associated with the Ordovician to Devonian evolution of the northern Appalachian orogen. Due to the lack of well ties and minimal onshore exposure, geophysical data must be used in mapping the offshore stratigraphy. Outcropping geologic boundaries are tied to magnetic lineaments that parallel stratigraphy. These lineaments are correlated with reflections on seismic profiles in order to interpret the subsurface. Seismic isochron maps for successive basin development episodes display differences in geometry, implying that orogenic loading varied through time. The geometry and subsidence rates recorded by the Middle Ordovician Goose Tickle Group imply that it formed in a pro‐arc setting associated with loading during arc‐continent collision that was most intense in the northern Newfoundland Appalachians. The geometry and subsidence recorded by the overlying Long Point Group imply pro‐arc loading by Taconian allochthons in the Québec segment of the orogen. Diachronous subduction polarity reversal along the margin placed the Long Point Group in a combined retro‐arc and pro‐arc setting, comparable to that experienced by parts of the north Australian margin at the present day. The uppermost Silurian to Lower Devonian Clam Bank Formation and Lower Devonian Red Island Road Formation represent foreland basin successions associated with the later Salinian and Acadian orogenies. Their consistent thickness implies a broad, shallow basin, suggesting that the lithosphere was cooler and stronger than during earlier subsidence, and are consistent with a retro‐arc setting.

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“…), where younger Lower Silurian rocks outcrop, 2.3 km of strata has been removed by erosion (Pinet et al. ). Considering the fact that these Lower Silurian age rocks also covered most of the basin in the region, the amount of strata eroded offshore Sept‐Îles is probably much greater due to the outcrop of the older Trenton Group rocks in this sector.…”

Section: Regional Geologymentioning

confidence: 99%

The Corossol structure: A possible impact crater on the seafloor of the northwestern Gulf of St. Lawrence, Eastern Canada

Lajeunesse

St‐Onge

Locat

et al. 2013

Meteorit & Planetary Scien

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Abstract-We report on a 4.1 (AE0.2) km diameter and 185 m deep circular submarine structure exposed on the seabed in >40 m water depths in the northwestern Gulf of St. Lawrence (Eastern Canada) from the analysis of high-resolution multibeam bathymetric and seismic data. The presence of a circular form characterized by a central uplift and concentric rings resembles the morphology and geometry of complex meteorite impact structures. Also, other origins, such as kimberlites, intrusions, karsts, or diapirs, can be eliminated on geological criteria. A single 4 cm long breccia fragment recovered from the central uplift has numerous glassy droplets of fluorapatite composition, assumed to be impact melts, and a single quartz grain with planar intersection features thought to be shock-induced planar deformation features (PDFs). The absolute age of this possible impact structure is unknown, but its geological setting indicates that it was formed long after the Mid-Ordovician and before regional pre-Quaternary sea-level lowstands. Present results outline the need for further examination to confirm an impact origin and to precisely date the formation of the structure.

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Revisiting the Appalachian structural front and offshore Anticosti Basin (northern Gulf of St. Lawrence, Canada) by integrating old and new geophysical datasets

Cited by 13 publications

References 55 publications

Geothermal resource assessment of remote sedimentary basins with sparse data: lessons learned from Anticosti Island, Canada

Geothermal resource assessment of remote sedimentary basins with sparse data: lessons learned from Anticosti Island, Canada

Anticosti foreland basin offshore of western Newfoundland: Concealed record of northern Appalachian orogen development

The Corossol structure: A possible impact crater on the seafloor of the northwestern Gulf of St. Lawrence, Eastern Canada

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