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Crustal structure of the Midcontinent rift system: Results from GLIMPCE deep seismic reflection profiles

1988; Geological Society of America; Volume: 16; Issue: 1 Linguagem: Inglês

10.1130/0091-7613(1988)016 2.3.co;2

1943-2682

John C. Behrend, A. G. Green, William F. Cannon, D. R. Hutchinson, M. W. Lee, B. Milkereit, W.F. Agena, Carl Spencer,

Seismic Imaging and Inversion Techniques

Research Article| January 01, 1988 Crustal structure of the Midcontinent rift system: Results from GLIMPCE deep seismic reflection profiles J. C. Behrend; J. C. Behrend 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar A. G. Green; A. G. Green 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar W. F. Cannon; W. F. Cannon 3U.S. Geological Survey, National Center, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar D. R. Hutchinson; D. R. Hutchinson 4U.S. Geological Survey, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar M. W. Lee; M. W. Lee 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar B. Milkereit; B. Milkereit 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar W. F. Agena; W. F. Agena 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar C. Spencer C. Spencer 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information J. C. Behrend 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 A. G. Green 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada W. F. Cannon 3U.S. Geological Survey, National Center, Reston, Virginia 22092 D. R. Hutchinson 4U.S. Geological Survey, Woods Hole, Massachusetts 02543 M. W. Lee 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 B. Milkereit 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada W. F. Agena 1U.S. Geological Survey, M.S. 903, Federal Center, Denver, Colorado 80225 C. Spencer 2Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0E8, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (1): 81–85. https://doi.org/10.1130/0091-7613(1988)016 2.3.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 J. C. Behrend, A. G. Green, W. F. Cannon, D. R. Hutchinson, M. W. Lee, B. Milkereit, W. F. Agena, C. Spencer; Crustal structure of the Midcontinent rift system: Results from GLIMPCE deep seismic reflection profiles. Geology 1988;; 16 (1): 81–85. doi: https://doi.org/10.1130/0091-7613(1988)016 2.3.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 Interpretation of Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE) seismic reflection profiles indicates that the Midcontinent (Keweenawan,1100 Ma) rift system of volcanic rocks and postvolcanic and interbedded sedimentary rocks extends to depths as great as 32 km (about 10.5-s reflection time) along profiles crossing western, central, and eastern Lake Superior and the northern end of Lake Michigan. This area may overlie the greatest thickness of intracratonic rift deposits on Earth. Times to Moho reflections vary along strike from 11.5 to 14 s (about 37-46 km depth) in the west, to 17 s (about 55 km) in the center, and 13 to 15 s (about 42-49 km) in the eastern end of Lake Superior. The prerift crust, however, was thinned 25-30 km beneath the central rift (compared with its flanks), providing evidence for crustal extension by factors of about 3-4. The Midcontinent rift system differs from Phanerozoic rifts in having total crustal thicknesses equal to or greater than the surrounding (presumably unextended) regions. This content is PDF only. Please click on the PDF icon to access. 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.