New geologic mapping and SHRIMP U-Pb zircon data in the Peninsular Ranges batholith, Baja California, Mexico: Evidence for a suture?

Research Article| August 01, 1999 New geologic mapping and SHRIMP U-Pb zircon data in the Peninsular Ranges batholith, Baja California, Mexico: Evidence for a suture? Scott E. Johnson; Scott E. Johnson 1Department of Earth and Planetary Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and Departamento de Geología, CICESE, Km 107 Carratera Ensenada-Tijuana, Baja California, México Search for other works by this author on: GSW Google Scholar Marcus C. Tate; Marcus C. Tate 2Department of Earth and Planetary Sciences, Macquarie University, Sydney, New South Wales 2109, Australia Search for other works by this author on: GSW Google Scholar C. Mark Fanning C. Mark Fanning 3Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Scott E. Johnson 1Department of Earth and Planetary Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and Departamento de Geología, CICESE, Km 107 Carratera Ensenada-Tijuana, Baja California, México Marcus C. Tate 2Department of Earth and Planetary Sciences, Macquarie University, Sydney, New South Wales 2109, Australia C. Mark Fanning 3Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (8): 743–746. https://doi.org/10.1130/0091-7613(1999)027<0743:NGMASU>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Scott E. Johnson, Marcus C. Tate, C. Mark Fanning; New geologic mapping and SHRIMP U-Pb zircon data in the Peninsular Ranges batholith, Baja California, Mexico: Evidence for a suture?. Geology 1999;; 27 (8): 743–746. doi: https://doi.org/10.1130/0091-7613(1999)027<0743:NGMASU>2.3.CO;2 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 Geologic and SHRIMP U-Pb zircon studies in the Sierra San Pedro Mártir area of northern Baja California, Mexico, suggest that the western and eastern parts of the Peninsular Ranges batholith originated as separate arcs. They are now juxtaposed along a well-exposed ductile thrust (Main Mártir thrust) marked by an age discontinuity of at least 10 to 15 m.y., and sharp changes in rock type, metamorphic grade, and deformation history. The east-dipping thrust, and adjacent highly deformed rocks, were stitched by 108–97 Ma plutons that were generated in a region of crustal thickening formed during juxtaposition of the two arcs. Lack of chemical, isotopic, and geologic evidence for continentally derived rocks in the western arc may preclude an origin by rifting of the continental margin, or development of the arc on a prism of continentally derived sediments adjacent to the continental margin. Instead, the western arc may have originated as an island arc above a subduction zone outboard of North America. If so, a second, concurrent subduction zone along the North American margin must have driven convergence and suturing of the two arcs, and the Main Mártir thrust may mark a nonterminal suture within a wider convergence-related deformation zone that formed ca. 115–108 Ma. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.