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Member Recognition Issue VOL. 31, NO. 7 | J U LY 2 021 ’Taters versus Sliders: Evidence for a Long-Lived History of Strike-Slip Displacement along the Canadian Arctic Transform System (CATS) EXPAND YOUR LIBRARY with GSA E-books The GSA Store offers hundreds of e-books, most of which are only $9.99. These include: • popular field guides and maps; Special Paper 413 • out-of-print books on prominent topics; and Earth and • discontinued series, such as Engineering How GeologistsMind: Think Geology Case Histories, Reviews in and Learn about the Earth Engineering Geology, and the Decade of North American Geology. Each book is available as a PDF, including plates and supplemental material. Popular topics include ophiolites, the Hell Creek Formation, mass extinctions, and plates and plumes. edited by Cathryn A. Manduca and David W. Mogk Shop now at https://rock.geosociety.org/store/. JULY 2021 | VOLUME 31, NUMBER 7 SCIENCE 4 ’Taters versus Sliders: Evidence for a Long- Lived History of Strike Slip Displacement along the Canadian Arctic Transform System (CATS) GSA TODAY (ISSN 1052-5173 USPS 0456-530) prints news and information for more than 22,000 GSA member readers William C. McClelland et al. and subscribing libraries, with 11 monthly issues (March- April is a combined issue). GSA TODAY is published by The Geological Society of America® Inc. (GSA) with offices at Cover: Geologists studying structures along the Petersen Bay 3300 Penrose Place, Boulder, Colorado, USA, and a mail- fault, a segment of the Canadian Arctic transform system (CATS), ing address of P.O. Box 9140, Boulder, CO 80301-9140, USA. on northern Ellesmere Island. Photo taken by B. McClelland. See GSA provides this and other forums for the presentation of diverse opinions and positions by scientists worldwide, related article, p. 4–11. regardless of race, citizenship, gender, sexual orientation, religion, or political viewpoint. Opinions presented in this publication do not reflect official positions of the Society. © 2021 The Geological Society of America Inc. All rights GSA CONNECTS 2021 reserved. Copyright not claimed on content prepared wholly by U.S. government employees within the scope of their employment. Individual scientists are hereby granted 12 Welcome 14 Join the OTF Community by permission, without fees or request to GSA, to use a single Mentoring a Student figure, table, and/or brief paragraph of text in subsequent work and to make/print unlimited copies of items in GSA 13 Honoring the Best at GSA TODAY for noncommercial use in classrooms to further Connects 2021 15 GeoCareers education and science. 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Uncertainty in Science and Practice 18 Get into the Field with GSA: Managing Editor: Kristen “Kea” Giles, [email protected], [email protected] 2021 Field Award Recipients 40 New and Updated Position Graphics Production: Emily Levine, [email protected] Statements Advertising Manager: Ann Crawford, 19 GSA Expanding Representation +1-800-472-1988 ext. 1053; +1-303-357-1053; in the Geosciences Scholarships 42 Professional Geologist Licensure Fax: +1-303-357-1070; [email protected] Requirements Webinar GSA Online: www.geosociety.org 20 50-Year Member Anniversaries GSA TODAY: www.geosociety.org/gsatoday 43 Top Tips for Authors: How to Printed in the USA using pure soy inks. 21 25-Year Member Anniversaries Nail the Initial Quality Check and Ensure Your Paper Gets to the 22 2021 GSA Fellows Editor Faster 26 Welcome New GSA Members 44 Geoscience Jobs & Opportunities 34 In Memoriam 46 GSA Foundation Update 36 Meet Your Fiscal Year 2022 Officers & Councilors ’Taters versus Sliders: Evidence for a Long- Lived History of Strike-Slip Displacement along the Canadian Arctic Transform System (CATS) William C. McClelland, Dept. of Earth & Environmental Sciences, University of Iowa, Iowa City, Iowa 52242, USA; Justin V. Strauss, Dept. of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA; Maurice Colpron, Yukon Geological Survey, Whitehorse, Yukon Y1A 2C6, Canada; Jane A. Gilotti, Dept. of Earth & Environmental Sciences, University of Iowa, Iowa City, Iowa 52242, USA; Karol Faehnrich, Dept. of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, USA; Shawn J. Malone, Dept. of Geoscience, University of Wisconsin, Green Bay, Wisconsin 54311, USA; George E. Gehrels, Dept. of Geosciences, University of Arizona, Tucson, Arizona 85721, USA; Francis A. Macdonald, Earth Science Dept., University of California, Santa Barbara, California 93106, USA; John S. Oldow, Borealis, 200 E. Troxell Road, Oak Harbor, Washington 98277, USA, and Dept. of Geology, Western Washington University, Bellingham, Washington 98225, USA ABSTRACT the northwestern Alaskan and Canadian followed mafic magmatism associated with Recent field-based studies indicate that the Arctic margins provide the clearest rationale the Franklin Large Igneous Province at 720 northern margin of North America is best for the rotation model (Embry, 1990), which Ma (Macdonald et al., 2010; Cox et al., interpreted as a tectonic boundary that experi- is by far the most commonly expressed 2015). The basin is flanked to the north by enced a long, complex history of strike-slip mechanism (e.g., Hutchinson et al., 2017; Ordovician to Silurian clastic and subduction- displacement. Structures juxtaposing the Miller et al., 2018). In contrast, we explore related mafic and ultramafic rocks and alloch- Pearya and Arctic Alaska terranes with North the implications of a growing set of onshore thonous units of the Pearya terrane (Fig. 1; America are linked and define the Canadian observations that indicate that the northern Trettin, 1998). The Pearya terrane is domi- Arctic transform system (CATS) that accom- Laurentian margin has experienced a pro- nated by two assemblages juxtaposed in modated Paleozoic terrane translation, trun- tracted history of translation. This view is the Ordovician: a displaced peri-Laurentian cation of the Caledonian orogen, and shorten- bolstered by a variety of data that support crustal fragment that records early Neo- ing within the transpressional Ellesmerian models of Paleozoic large-magnitude terrane proterozoic (Tonian) and Ordovician conver- orogen. The structure was reactivated during translation through the Arctic region (Colpron gent margin magmatism (Malone et al., 2017, Mesozoic translational opening of the Canada and Nelson, 2009). Despite early calls for 2019) and a latest Neoproterozoic (Ediacaran) Basin. Land-based evidence supporting trans- large-magnitude sinistral offsets (e.g., Boreal to Ordovician mafic arc complex built on lation along the Canadian Arctic margin is fault of Bally in Kerr et al., 1982; Canadian Tonian basement (Majka et al., 2021). Steeply consistent with transform structures defined transcurrent fault of Hubbard et al., 1987; dipping faults juxtaposed Pearya with the by marine geophysical data, thereby provid- Porcupine fault of Oldow et al., 1989), the Laurentian passive margin by the Devonian ing a robust alternative to the current consen- Canadian Arctic margin generally has not (Trettin, 1998; Malone et al., 2019). Sub- sus model for rotational opening of the been viewed as a viable candidate for trans- sequently, units of both the Pearya terrane Canada Basin. form boundaries to accommodate evolution and Franklinian basin were deformed within of the Arctic region (e.g., Doré et al., 2016). the Devonian–Carboniferous Ellesmerian INTRODUCTION Results of our recent field studies on the fold belt and overlain by Carboniferous and Recent ocean- and land-based studies of northern margin of Laurentia challenge this younger deposits of the Sverdrup basin. the circum-Arctic region bring significant
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