4.7 Article

Wyoming on the run-Toward final Paleoproterozoic assembly of Laurentia

Journal

GEOLOGY
Volume 44, Issue 10, Pages 863-866

Publisher

GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G38042.1

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Funding

  1. National Science Foundation [EAR-1019595, EAR-1019739]
  2. LIPs-Supercontinent Reconstruction Project (CAMIRO) [08E03]
  3. LIPs-Supercontinent Reconstruction Project (NSERC CRDPJ) [419503-11]
  4. Division Of Earth Sciences
  5. Directorate For Geosciences [1019595] Funding Source: National Science Foundation

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Paleoproterozoic suture zones mark the formation of supercontinent Nuna and provide a record of North America's assembly. Conspicuously young ages (ca. 1.715 Ga) associated with deformation in southeast Wyoming craton argue for a more protracted consolidation of Laurentia, long after peak metamorphism in the Trans-Hudson orogen. Using paleomagnetic data from the newly dated 1899 +/- 5 Ma Sourdough mafic dike swarm (Wyoming craton), we compare the relative positions of Wyoming, Superior, and Slave cratons before, during, and after peak metamorphism in the Trans-Hudson orogen. With these constraints, we refine a collisional model for Laurentia that incorporates Wyoming craton after Superior and Slave cratons united, redefining the Paleoproterozoic sutures that bind southern Laurentia.

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