Abstract
Research Article| June 01, 1987 Gravity patterns and Precambrian structure in the North American Central Plains M. D. Thomas; M. D. Thomas 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Search for other works by this author on: GSW Google Scholar V. L. Sharpton; V. L. Sharpton 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Search for other works by this author on: GSW Google Scholar R.A.F. Grieve R.A.F. Grieve 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information M. D. Thomas 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada V. L. Sharpton 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada R.A.F. Grieve 1Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1987) 15 (6): 489–492. https://doi.org/10.1130/0091-7613(1987)15<489:GPAPSI>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. D. Thomas, V. L. Sharpton, R.A.F. Grieve; Gravity patterns and Precambrian structure in the North American Central Plains. Geology 1987;; 15 (6): 489–492. doi: https://doi.org/10.1130/0091-7613(1987)15<489:GPAPSI>2.0.CO;2 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 SocietyGeology Search Advanced Search Abstract Bouguer gravity patterns revealed in horizontal gradient images are used to locate and examine the tectonic nature of Precambrian structural boundaries buried beneath the North American Central Plains. The southern boundary of the Superior province west of the midcontinent gravity high (MGH), interpreted as a collisional suture, is relocated as much as 200 km south of previous geophysically defined positions, close to a position defined recently by using drill-hole information; east of the high, this boundary is thought to trace a 900-km arc subparallel to the MGH. The western boundary of the Superior province is regarded as a suture containing significant components of transcurrent faulting. The eastern boundary of the Wyoming province, another suture, is traced northward into the Churchill province, near the northwestern margin of a 1900–1600 Ma magmatic belt. This boundary and Proterozoic terrane to the east are transected by previously unrecognized faults hundreds of kilometres long. Gravity patterns also suggest that the North American Central Plains conductivity anomaly may not be a continuous, suture-related conductor. First Page Preview Close Modal 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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