Igniting flare-up events in Cordilleran arcs

Abstract

Research Article| November 01, 2007 Igniting flare-up events in Cordilleran arcs Mihai N. Ducea; Mihai N. Ducea 1University of Arizona, Department of Geosciences, Tucson, Arizona, 85721, USA Search for other works by this author on: GSW Google Scholar Mark D. Barton Mark D. Barton 1University of Arizona, Department of Geosciences, Tucson, Arizona, 85721, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Mihai N. Ducea 1University of Arizona, Department of Geosciences, Tucson, Arizona, 85721, USA Mark D. Barton 1University of Arizona, Department of Geosciences, Tucson, Arizona, 85721, USA Publisher: Geological Society of America Received: 22 Mar 2007 Revision Received: 16 Jun 2007 Accepted: 28 Jun 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2007) 35 (11): 1047–1050. https://doi.org/10.1130/G23898A.1 Article history Received: 22 Mar 2007 Revision Received: 16 Jun 2007 Accepted: 28 Jun 2007 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 Mihai N. Ducea, Mark D. Barton; Igniting flare-up events in Cordilleran arcs. Geology 2007;; 35 (11): 1047–1050. doi: https://doi.org/10.1130/G23898A.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 High-flux pulses of magmatism that make up most of the exposed North American Cordilleran arcs are derived primarily from upper plate lithospheric source materials, and not the mantle wedge as most models would predict, based on a compilation of thousands of previously published Sr, Nd, and O isotopic data. Mass balance calculations show that no more than 50% of that mass can be mantle-derived. Flare-ups must have fundamentally developed simultaneously with crustal/lithospheric thickening, thus implying a connection. Subduction erosion from the trench side, and retroarc shortening from the foreland side are the main tectonic shortening processes that operate in conjunction with high flux magmatism during subduction, and therefore are likely triggers for flare-up events in arc. These arcs represent the sites of crustal differentiation, and thus contribute to net continental growth, only if dense residual lower crust was returned to the convective mantle. Isotopic data shown here suggest that if convective removal of batholithic roots takes place, it must be a consequence and not a cause of episodic flare-ups. The Altiplano-Puna Volcanic Complex in South America may be the most recent continental arc segment in flare-up mode. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.