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Research Article| November 01, 2011 Fracturing of the Panamanian Isthmus during initial collision with South America David W. Farris; David W. Farris 1Florida State University, Department of Earth, Ocean, and Atmospheric Sciences, Tallahassee, Florida 32306, USA Search for other works by this author on: GSW Google Scholar Carlos Jaramillo; Carlos Jaramillo 2Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA Search for other works by this author on: GSW Google Scholar German Bayona; German Bayona 2Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA3Corporación Geológica ARES, Calle 44A N. 53-96 Bogotá, Colombia Search for other works by this author on: GSW Google Scholar Sergio A. Restrepo-Moreno; Sergio A. Restrepo-Moreno 2Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA4University of Florida, Department of Geological Sciences, Gainesville, Florida 32611, USA Search for other works by this author on: GSW Google Scholar Camilo Montes; Camilo Montes 2Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA3Corporación Geológica ARES, Calle 44A N. 53-96 Bogotá, Colombia Search for other works by this author on: GSW Google Scholar Agustin Cardona; Agustin Cardona 2Smithsonian Tropical Research Institute, Unit 0948, APO AA 34002-0948, USA3Corporación Geológica ARES, Calle 44A N. 53-96 Bogotá, Colombia Search for other works by this author on: GSW Google Scholar Andres Mora; Andres Mora 5Instituto Colombiano del Petroleo, Ecopetrol, Bucaramanga, Colombia Search for other works by this author on: GSW Google Scholar Robert J. Speakman; Robert J. Speakman 6Smithsonian Institution, Museum Conservation Institute, Washington, D.C. 20012, USA Search for other works by this author on: GSW Google Scholar Michael D. Glascock; Michael D. Glascock 7University of Missouri, Archaeometry Laboratory, Columbia, Missouri 65211, USA Search for other works by this author on: GSW Google Scholar Victor Valencia Victor Valencia 8University of Arizona, Department of Geosciences, Tucson, Arizona 85721, USA Search for other works by this author on: GSW Google Scholar Geology (2011) 39 (11): 1007–1010. https://doi.org/10.1130/G32237.1 Article history received: 08 Mar 2011 rev-recd: 19 May 2011 accepted: 24 May 2011 first online: 09 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 David W. Farris, Carlos Jaramillo, German Bayona, Sergio A. Restrepo-Moreno, Camilo Montes, Agustin Cardona, Andres Mora, Robert J. Speakman, Michael D. Glascock, Victor Valencia; Fracturing of the Panamanian Isthmus during initial collision with South America. Geology 2011;; 39 (11): 1007–1010. doi: https://doi.org/10.1130/G32237.1 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 SocietyGeology Search Advanced Search Abstract Tectonic collision between South America and Panama began at 23–25 Ma. The collision is significant because it ultimately led to development of the Panamanian Isthmus, which in turn had wide-ranging oceanic, climatic, biologic, and tectonic implications. Within the Panama Canal Zone, volcanic activity transitioned from hydrous mantle-wedge−derived arc magmatism to localized extensional arc magmatism at 24 Ma, and overall marks a permanent change in arc evolution. We interpret the arc geochemical change to result from fracturing of the Panama block during initial collision with South America. Fracturing of the Panama block led to localized crustal extension, normal faulting, sedimentary basin formation, and extensional magmatism in the Canal Basin and Bocas del Toro. Synchronous with this change, both Panama and inboard South America experienced a broad episode of exhumation indicated by (U-Th)/He and fission-track thermochronology coupled with changing geographic patterns of sedimentary deposition in the Colombian Eastern Cordillera and Llanos Basin. Such observations allow for construction of a new tectonic model of the South America–Panama collision, northern Andes uplift and Panama orocline formation. Finally, synchroneity of Panama arc chemical changes and linked uplift indicates that onset of collision and Isthmus formation began earlier than commonly assumed. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.