Extensional shear zones, granitic melts, and linkage of overstepping normal faults bounding the Shuswap metamorphic core complex, British Columbia

Research Article| March 01, 2006 Extensional shear zones, granitic melts, and linkage of overstepping normal faults bounding the Shuswap metamorphic core complex, British Columbia Bradford J. Johnson Bradford J. Johnson 1385 Carlo Drive, Goleta, California 93117, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Bradford J. Johnson 1385 Carlo Drive, Goleta, California 93117, USA Publisher: Geological Society of America Received: 28 Jan 2005 Revision Received: 16 Jul 2005 Accepted: 22 Jul 2005 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (2006) 118 (3-4): 366–382. https://doi.org/10.1130/B25800.1 Article history Received: 28 Jan 2005 Revision Received: 16 Jul 2005 Accepted: 22 Jul 2005 First Online: 08 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 Bradford J. Johnson; Extensional shear zones, granitic melts, and linkage of overstepping normal faults bounding the Shuswap metamorphic core complex, British Columbia. GSA Bulletin 2006;; 118 (3-4): 366–382. doi: https://doi.org/10.1130/B25800.1 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 An investigation of a normal-fault system in the southern Canadian Cordillera documents extensional shear zones exhumed from the middle crust, including the root of a transfer zone between overstepping fault segments in which shearing was enhanced by leucogranitic melts. The western margin of the Shuswap metamorphic core complex is delimited by west-dipping, ductile-brittle normal faults of the Eocene Okanagan Valley fault system. Migmatites with gently dipping mylonitic fabrics have been exhumed in the footwalls of the Okanagan–Eagle River and Adams–North Thompson fault segments. The mylonitic fabrics formed in upper amphibolite facies, continued to evolve in greenschist facies, and display asymmetric features that consistently indicate westward movement of the hanging wall. The Shuswap Lake transfer zone is a 45-km-wide left stepover between the two fault segments where a domed mylonitic shear zone has been exhumed and cut by high-angle brittle faults. Mylonites in the transfer zone display the same sense of shear as the mylonites that are associated with the overstepping fault segments. All of these mylonites are interpreted as having formed in a mid-crustal shear zone in which the fault system was rooted. The mylonites in the transfer zone are distinct, however, in that they formed in leucogranite (the Pukeashun granite). Structural relationships imply that the leucogranitic melts were emplaced during extensional shearing and that their distribution may have been influenced by preexisting structures in both the footwall and the hanging wall of the system. The melts in turn controlled the evolution of the transfer zone, facilitating the processes of heterogeneous extension, footwall doming, and differential exhumation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.