Anomalous Paleomagnetic Pole from Isotopically Dated Cambro-Ordovician Intrusives in Colorado

Abstract

Research Article| June 01, 1971 Anomalous Paleomagnetic Pole from Isotopically Dated Cambro-Ordovician Intrusives in Colorado EDWIN E LARSON; EDWIN E LARSON Department of Geological Sciences, University of Colorado, Boulder, Colorado 80302 Search for other works by this author on: GSW Google Scholar FELIX E MUTSCHLER FELIX E MUTSCHLER Department of Geology, Eastern Washington State College, Cheney, Washington 99004 Search for other works by this author on: GSW Google Scholar Author and Article Information EDWIN E LARSON Department of Geological Sciences, University of Colorado, Boulder, Colorado 80302 FELIX E MUTSCHLER Department of Geology, Eastern Washington State College, Cheney, Washington 99004 Publisher: Geological Society of America Received: 07 Oct 1970 Revision Received: 31 Dec 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1971, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1971) 82 (6): 1657–1666. https://doi.org/10.1130/0016-7606(1971)82[1657:APPFID]2.0.CO;2 Article history Received: 07 Oct 1970 Revision Received: 31 Dec 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation EDWIN E LARSON, FELIX E MUTSCHLER; Anomalous Paleomagnetic Pole from Isotopically Dated Cambro-Ordovician Intrusives in Colorado. GSA Bulletin 1971;; 82 (6): 1657–1666. doi: https://doi.org/10.1130/0016-7606(1971)82[1657:APPFID]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 Paleomagnetic data from isotopically dated Cambrian and Ordovician plutons in central Colorado indicate a Cambrian-Ordovician paleopole close to the late Paleozoic pole position.Samples were partially demagnetized by both ac and thermal techniques. Magnetic directions were essentially the same regardless of treatment. Polished section and Curie temperature analysis indicate that the principal magnetic phase is low-titanium titanomagnetite. In many samples, titanomagnetite is the only magnetic iron oxide; in some samples, hematite occurs additionally. However, those samples containing hematite show the same remanent directions as those containing only titanomagnetite. All of our studies indicate that the magnetization is thermoremanent magnetization (TRM) acquired during the Cambrian and Ordovician.Our results suggest that either little polar wandering occurred between the early and late Paleozoic or, if substantial wandering did occur, by late Paleozoic time the paleopole has returned to a position that was nearly coincident with that of the early Paleozoic. 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.