Yukon-Tanana terrane: A partial acquittal

Abstract

Research Article| April 01, 1990 Yukon-Tanana terrane: A partial acquittal Vicki L. Hansen Vicki L. Hansen 1Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275 Search for other works by this author on: GSW Google Scholar Author and Article Information Vicki L. Hansen 1Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (4): 365–369. https://doi.org/10.1130/0091-7613(1990)018<0365:YTTAPA>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 Vicki L. Hansen; Yukon-Tanana terrane: A partial acquittal. Geology 1990;; 18 (4): 365–369. doi: https://doi.org/10.1130/0091-7613(1990)018<0365:YTTAPA>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 The Yukon-Tanana composite terrane, northern Canada and eastern Alaska, is divisible into two distinct terranes on the basis of metamorphic cooling ages and inferred structural level. The Nisling terrane records Early Cretaceous cooling ages, whereas the Teslin-Taylor Mountain terrane records pre-Late Jurassic cooling. The Nisling terrane, present at the lowest structural levels within the Yukon-Tanana terrane, represents North American continental-margin crust that was partly subducted beneath the accretionary prism of a southwest-dipping (present-day coordinates) early Mesozoic subduction complex, represented by the Teslin-Taylor Mountain and Slide Mountain terranes. The Nisling is exposed as a result of mid-Cretaceous crustal extension subsequent to Jurassic crustal thickening related to Teslin-Taylor Mountain-Slide Mountain emplacement. Although the Nisling and Teslin-Taylor Mountain terranes have many petrologic and tectonic differences, their mutual relations provide a unified view of early to middle Mesozoic tectonics of the western North American margin, a view that dispels the notion that large tracts of the northern Cordillera are "suspect." 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.