168 Laurentia Without Borders: Pre-Pangea Intercontinental Connections

The ancient core of North America is surrounded by Neoproterozoic to early Paleozoic rifts, indicating former juxtaposition with several other cratons. This session will explore these former connections and their paleogeographic, tectonic, and paleoenvironmental implications.

Tuesday, 21 October 2025
8:00 AM - 12:00 PM
HBGCC, 217C

Participants

• Chair Ian Dalziel
• Chair Staci Loewy
• Chair Patricia Dickerson
• Chair Joshua Malone

Presentations

• 8:05 AM
  Long-lived Proterozoic Triad of Western Laurentia, Australia and Antarctica within Nuna and Rodinia
  John Goodge, University of Minnesota Duluth, Duluth, MN
  412400 (Technical Sessions)
• 8:25 AM
  The Thermal Legacy of Pannotia Amalgamation
  J. Brendan Murphy, St. Francis Xavier U, Antigonish, NS and R. Nance, Ohio University, Geological Sciences, Stratford, CT
  412120 (Technical Sessions)
• 8:45 AM
  Coats Land, a Piece of West Texas in Antarctica
  Staci Loewy, The University of Texas at Austin, Austin, Tx and Ian Dalziel, The University of Texas at Austin, Austin, TX
  414367 (Technical Sessions)
• 9:00 AM
  The Ellsworth-Coats Land (Antarctic) Promontory of Laurentia
  Ian Dalziel, University of Texas at Austin, Austin, Texas and Staci Loewy, University of Texas at Austin, Austin, Texas and Patricia Dickerson, University of Texas at Austin, Austin, Texas and Joshua Malone, University of Texas at Austin, Austin, Texas
  412145 (Technical Sessions)
• 9:15 AM
  What’s under the ice? Implications for Precambrian Antarctic terrane architecture from Pb isotope geochemistry of Proterozoic granite till clasts from the Transantarctic Mountains
  Richard Gaschnig, University of Massachusetts Lowell, Lowell, MA and John Goodge, University of Minnesota Duluth, Dept. of Earth & Env. Sciences, Duluth, MN and Shelby Rader, Indiana University, Bloomington, IN
  412197 (Technical Sessions)
• 9:45 AM
  Peripatetic Laurentian Terranes: Relations of Cuyania and the Ellsworth-Whitmore Mountains Block to the Laurentian 'Mainland'
  Patricia Dickerson, University of Texas at Austin, Austin, Texas and Ian Dalziel, University of Texas at Austin, Austin, Texas and Staci Loewy, University of Texas at Austin, Austin, Texas and Joshua Malone, University of Texas at Austin, Austin, Texas
  414945 (Technical Sessions)
• 10:00 AM
  A Mesoproterozoic Tectonic and Metallogenic link between Laurentia and Southeastern Australia: New Evidence from Tasmania’s Rocky Cape Group
  Sheree Armistead, University of Tasmania, Hobart, Tasmania and Sebastien Meffre, University of Tasmania, Hobart, Tasmania and Ralph Bottrill, Mineral Resources Tasmania, Hobart and Andrew Cross, Geoscience Australia, Canberra and David Huston, Australian National University, Canberra and Grace Cumming, Mineral Resources Tasmania, Hobart
  413824 (Technical Sessions)
• 10:15 AM
  New insights on the Gaskiers timing, volcanic rifted margin setting and orbitally forced cyclicity of the mid-Ediacaran Wonoka canyons of South Australia
  Nicholas Christie-Blick, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY and Sarah Giles, Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY and Nicholas Direen, Mitre Geophysics, Fremantle, WA
  411934 (Technical Sessions)
• 10:30 AM
  A 3.82 Ga granodioritic gneiss with Hadean xenocrystic zircon grains in the Bridger Range, Montana: Remnants of Earth's early crust
  Rebekah Kennedy, Montana State University, Bozeman, MT and Devon Orme, Montana State University, Bozeman, MT and Michelle Foley, University of Arizona, Tucson, AZ and Daniel Alberts, The University of Arizona, Tucson, AZ and Martin Senger, University of Arizona, Tucson, AZ and Mauricio Ibanez-Mejia, University of Arizona, Geosciences, Tucson, AZ and George Gehrels, Univ ArizonaDept Geosciences, Tucson, AZ
  412812 (Technical Sessions)