Abstract
Research Article| May 01, 1978 Penokean deformation and associated metamorphism in the western Marquette Range, northern Michigan JOHN S. KLASNER JOHN S. KLASNER 1Department of Geology, Western Illinois University, Macomb, Illinois 61455 Search for other works by this author on: GSW Google Scholar Author and Article Information JOHN S. KLASNER 1Department of Geology, Western Illinois University, Macomb, Illinois 61455 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1978) 89 (5): 711–722. https://doi.org/10.1130/0016-7606(1978)89<711:PDAAMI>2.0.CO;2 Article history First Online: 01 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 JOHN S. KLASNER; Penokean deformation and associated metamorphism in the western Marquette Range, northern Michigan. GSA Bulletin 1978;; 89 (5): 711–722. doi: https://doi.org/10.1130/0016-7606(1978)89<711:PDAAMI>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 SocietyGSA Bulletin Search Advanced Search Abstract Geologic studies of Precambrian rocks in northern Michigan indicate that the Penokean orogeny, which occurred about 1.9 b.y. ago, consisted of four stages of deformation, three of which occurred during a prolonged period of regional metamorphism. The first two stages of deformation were possibly caused by gravity sliding northward off an ancestral Penokean range located in central Wisconsin. The deformation probably started while the sediments were still soft, and it produced a pervasive west-northwest–trending foliation in the middle Precambrian rocks. The third and fourth stages of deformation were caused by uplift of rigid blocks of lower Precambrian basement rocks; this uplift produced prominent grabens such as the Marquette and Republic troughs. Metamorphism began very early in the deformational sequence, peaked during the third stage of deformation, and ended in a period of retrograde metamorphism. 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.
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