Paleomagnetic evidence for tectonic rotation of the Oregon Coast Range

Research Article| October 01, 1977 Paleomagnetic evidence for tectonic rotation of the Oregon Coast Range Robert W. Simpson; Robert W. Simpson 1Geophysics Department, Stanford University, Stanford, California 94305 Search for other works by this author on: GSW Google Scholar Allan Cox Allan Cox 1Geophysics Department, Stanford University, Stanford, California 94305 Search for other works by this author on: GSW Google Scholar Author and Article Information Robert W. Simpson 1Geophysics Department, Stanford University, Stanford, California 94305 Allan Cox 1Geophysics Department, Stanford University, Stanford, California 94305 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1977) 5 (10): 585–589. https://doi.org/10.1130/0091-7613(1977)5<585:PEFTRO>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 Email Permissions Search Site Citation Robert W. Simpson, Allan Cox; Paleomagnetic evidence for tectonic rotation of the Oregon Coast Range. Geology 1977;; 5 (10): 585–589. doi: https://doi.org/10.1130/0091-7613(1977)5<585:PEFTRO>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 Paleomagnetic directions from lower, middle, and upper Eocene sedimentary and volcanic rocks in the Oregon Coast Range point 50° to 70° east of the expected Eocene field direction. This discrepancy is attributed to the tectonic rotation of a block at least 225 km in length extending from just north of the Klamath Mountains to north of Newport, Oregon. Two models are developed for the tectonic evolution of the Pacific Northwest. In the first, the coastal block is rotated seaward about a pivot point near its southern end in order to restore it to its Eocene position. In the second, it is assumed that the coastal block extends all the way to the Olympic Peninsula. Rotating the block back about a pivot near its northern end moves the southern end and the Klamath Mountains eastward across Oregon and restores the Klamath metamorphic belts to a position against the line of Cretaceous batholiths in northwestern Nevada. 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.