A structural study of western Anticosti Island, St. Lawrence platform, Quebec: a fracture analysis that integrates surface and subsurface structural data

Research Article| March 01, 2010 A structural study of western Anticosti Island, St. Lawrence platform, Québec: a fracture analysis that integrates surface and subsurface structural data Esther Bordet; Esther Bordet Institut National de la Recherche Scientifique Centre - Eau Terre Environnement, 490 de la Couronne, Québec, QC G1K 9A9 1Current address: The University of British Columbia, Department of Earth & Ocean Sciences, Mineral Deposit Research Unit, 6339 Stores Road, Vancouver, BC V6T 1Z4,ebordet@eos.ubc.ca Search for other works by this author on: GSW Google Scholar Michel Malo; Michel Malo Institut National de la Recherche Scientifique Centre - Eau Terre Environnement, 490 de la Couronne, Room 4340, Québec, QC G1K 9A9 Search for other works by this author on: GSW Google Scholar Donna Kirkwood Donna Kirkwood Geological Survey of Canada Québec, 490 de la Couronne, Room 3307, Québec, QC G1K 9A9 Search for other works by this author on: GSW Google Scholar Author and Article Information Esther Bordet 1Current address: The University of British Columbia, Department of Earth & Ocean Sciences, Mineral Deposit Research Unit, 6339 Stores Road, Vancouver, BC V6T 1Z4,ebordet@eos.ubc.ca Institut National de la Recherche Scientifique Centre - Eau Terre Environnement, 490 de la Couronne, Québec, QC G1K 9A9 Michel Malo Institut National de la Recherche Scientifique Centre - Eau Terre Environnement, 490 de la Couronne, Room 4340, Québec, QC G1K 9A9 Donna Kirkwood Geological Survey of Canada Québec, 490 de la Couronne, Room 3307, Québec, QC G1K 9A9 Publisher: Canadian Society of Petroleum Geologists Accepted: 18 Feb 2010 First Online: 02 Mar 2017 Online ISSN: 2368-0261 Print ISSN: 0007-4802 © The Society of Canadian Petroleum Geologists Bulletin of Canadian Petroleum Geology (2010) 58 (1): 36–55. https://doi.org/10.2113/gscpgbull.58.1.36 Article history Accepted: 18 Feb 2010 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Esther Bordet, Michel Malo, Donna Kirkwood; A structural study of western Anticosti Island, St. Lawrence platform, Québec: a fracture analysis that integrates surface and subsurface structural data. Bulletin of Canadian Petroleum Geology 2010;; 58 (1): 36–55. doi: https://doi.org/10.2113/gscpgbull.58.1.36 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of Canadian Petroleum Geology Search Advanced Search Abstract Field data from fracture sets, folds and faults affecting generally flat lying Lower Ordovician to Lower Silurian strata on western Anticosti Island, Québec, are integrated with remote sensing and seismic reflection data. Spatial and temporal relationships among different structural features observed on the Island and in the Gulf of St. Lawrence are assessed with the aim of understanding the role of these structural features for petroleum migration through the Anticosti Platform. The tectonic impact of Appalachian orogenic events on Anticosti Platform is considered, together with Jurassic and Quaternary tectonics.Four fracture sets are identified in Lower Silurian rocks: 1) a NS-EW orthogonal fracture system (Sets I and II); 2) a N40–70 set (Set III); 3) and a N135–165 set (Set IV). Some irregular, randomly oriented fractures are also observed. The orthogonal system may be related to Early Acadian events, which may have induced extensional stresses within the Platform during Late Silurian-Early Devonian time. Normal faults observed in the Lower Silurian succession may be related to this extensional event. The N135–165 and N40–70 sets may have developed either during the Middle Devonian Acadian orogeny or later in the Jurassic. The irregular fractures could have formed during the final stages of fracture development in response to erosion of the Lower Silurian and younger succession, or in response to isostatic rebound following glaciation.Shuttle Radar Digital Elevation Model lineaments are consistent either with observed fracture set orientations, or subsurface Taconian fault orientations. We infer some Taconian faults and Silurian fracture zones were reactivated, probably during the opening of the Atlantic Ocean, as indicated by the intrusion of two Jurassic dikes.In the subsurface of the Island, major SW-dipping normal faults and extensional fractures affect the Lower to Upper Ordovician succession most. These probably formed in response to an extensional stress field in front of the Taconian deformation front during Late Ordovician time.WSW-trending typically open folds occur on southern Anticosti Island in Chicotte Formation and in the Gulf of St. Lawrence. They involve Lower Silurian to Devonian rocks, and may have formed in a compressive regional setting during the Middle Devonian Acadian orogeny.Thermal maturation and petroleum generation on Anticosti Platform are controlled mainly by the burial history. However, the structures described in this study, in particular Taconian and Early Acadian fractures and faults systems, may have played an important role in petroleum migration and in potential reservoir development. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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