Paleomagnetic evidence for a large rotation of the Yukon block relative to Laurentia: Implications for a low-latitude Sturtian glaciation and the breakup of Rodinia

Research Article| January 01, 2017 Paleomagnetic evidence for a large rotation of the Yukon block relative to Laurentia: Implications for a low-latitude Sturtian glaciation and the breakup of Rodinia Athena E. Eyster; Athena E. Eyster † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA †aeyster@fas.harvard.edu Search for other works by this author on: GSW Google Scholar Roger R. Fu; Roger R. Fu 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Building 54-724, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Justin V. Strauss; Justin V. Strauss 3Department of Earth Sciences, Dartmouth College, HB6105 Fairchild Hall, Hanover, New Hampshire 03755, USA Search for other works by this author on: GSW Google Scholar Benjamin P. Weiss; Benjamin P. Weiss 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Building 54-724, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Charlie F. Roots; Charlie F. Roots 4Natural Resources Canada, c/o Box 2703, K-102, Whitehorse, Yukon Y1A 2C6, Canada §Deceased. Search for other works by this author on: GSW Google Scholar Galen P. Halverson; Galen P. Halverson 5Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montréal, Québec H3A0E8, Canada Search for other works by this author on: GSW Google Scholar David A.D. Evans; David A.D. Evans 6Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06520, USA Search for other works by this author on: GSW Google Scholar Francis A. Macdonald Francis A. Macdonald 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Athena E. Eyster † 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Roger R. Fu 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Building 54-724, Cambridge, Massachusetts 02139, USA Justin V. Strauss 3Department of Earth Sciences, Dartmouth College, HB6105 Fairchild Hall, Hanover, New Hampshire 03755, USA Benjamin P. Weiss 2Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Building 54-724, Cambridge, Massachusetts 02139, USA Charlie F. Roots §Deceased. 4Natural Resources Canada, c/o Box 2703, K-102, Whitehorse, Yukon Y1A 2C6, Canada Galen P. Halverson 5Department of Earth and Planetary Sciences, McGill University, 3450 University Street, Montréal, Québec H3A0E8, Canada David A.D. Evans 6Department of Geology and Geophysics, Yale University, New Haven, Connecticut 06520, USA Francis A. Macdonald 1Department of Earth and Planetary Sciences, Harvard University, 20 Oxford Street, Cambridge, Massachusetts 02138, USA †aeyster@fas.harvard.edu Publisher: Geological Society of America Received: 16 Sep 2015 Revision Received: 21 Jun 2016 Accepted: 10 Aug 2016 First Online: 02 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2016 Geological Society of America GSA Bulletin (2017) 129 (1-2): 38–58. https://doi.org/10.1130/B31425.1 Article history Received: 16 Sep 2015 Revision Received: 21 Jun 2016 Accepted: 10 Aug 2016 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 Athena E. Eyster, Roger R. Fu, Justin V. Strauss, Benjamin P. Weiss, Charlie F. Roots, Galen P. Halverson, David A.D. Evans, Francis A. Macdonald; Paleomagnetic evidence for a large rotation of the Yukon block relative to Laurentia: Implications for a low-latitude Sturtian glaciation and the breakup of Rodinia. GSA Bulletin 2017;; 129 (1-2): 38–58. doi: https://doi.org/10.1130/B31425.1 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 Understanding the tectonic history of the supercontinent Rodinia is crucial for testing proposed links among Neoproterozoic tectonics, supercontinent cycles, climate, and biogeochemistry. The Neoproterozoic Mount Harper volcanics of the Ogilvie Mountains, Yukon, Canada, interfinger with Sturtian-age (ca. 717–660 Ma) glacial deposits that were deposited in narrow, fault-bounded basins related to the breakup of Rodinia. Here, we present new paleomagnetic data from the Mount Harper volcanics and isolate four paleomagnetic directions: a low-temperature direction recording the present geomagnetic field, a mid-temperature direction consistent with a Cretaceous overprint, and two high-temperature directions, one of which is carried by hematite and likely represents a chemical overprint, and the other of which is carried by magnetite and likely is a primary direction. This primary pole passes the fold and conglomerate tests and includes a reversal but is 50° away from the coeval 721–712 Ma Laurentian Franklin large igneous province pole. This difference can be reconciled using a 50° counterclockwise rotation of the Yukon block relative to Laurentia. The prerotation reconstruction of the Yukon block relative to Laurentia aligns Neoproterozoic fault orientations and facies belts between the Wernecke and Mackenzie Mountains, rectifies paleoflow measurements in Mesoproterozoic and Paleoproterozoic strata, and realigns the orientation of the ca. 1260 Ma Bear River dikes with the Mackenzie dike swarm of northern Canada. This reconstruction also facilitates future studies that relate Neoproterozoic sedimentary and structural patterns to the fragmentation of Rodinia. Finally, this low-latitude pole supports the snowball Earth interpretation of the ca. 717 Ma Sturtian glacial deposits. 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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