Plate-tectonics model for Proterozoic continental accretion in the southwestern United States

Research Article| January 01, 1982 Plate-tectonics model for Proterozoic continental accretion in the southwestern United States Kent C. Condie Kent C. Condie 1Department of Geoscience, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801 Search for other works by this author on: GSW Google Scholar Geology (1982) 10 (1): 37–42. https://doi.org/10.1130/0091-7613(1982)10<37:PMFPCA>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Kent C. Condie; Plate-tectonics model for Proterozoic continental accretion in the southwestern United States. Geology 1982;; 10 (1): 37–42. doi: https://doi.org/10.1130/0091-7613(1982)10<37:PMFPCA>2.0.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 Proterozoic crustal provinces in the southwestern United States decrease in age south from the Archean Wyoming province. Supracrustal rocks define three major age provinces from north to south: 1.72 to 1.80, 1.65 to 1.72, and 1.1 to 1.2 b.y. Successions within each province are similar and define two assemblages: a bimodal volcanic assemblage commonly overlain by a quartzite-shale assemblage. Precambrian granitic plutons intrude all three provinces. Geochemical and Sr-isotope data indicate a variably depleted upper mantle source for basalts and a short-lived (<100 m.y.) lower-crustal source for granitic and felsic volcanic magmas.These observations can be explained by a plate-tectonics model involving successive marginal basin closures and Andean-type orogenies associated with southward-migrating arcs. The net result is to accrete ≥ 1,300 km of continental crust to the southwestern margin of North America between 1.8 and 1.1 b.y. ago. This content is PDF only. Please click on the PDF icon to access. 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.