Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust

Abstract

Research Article| May 01, 2011 Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust Kent C. Condie; Kent C. Condie † 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801, USA †E-mail: kcondie@nmt.edu Search for other works by this author on: GSW Google Scholar M.E. Bickford; M.E. Bickford 2Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Richard C. Aster; Richard C. Aster 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801, USA Search for other works by this author on: GSW Google Scholar Elena Belousova; Elena Belousova 3Department of Earth and Planetary Sciences, GEMOC, Macquarie University, Sydney, NSW 2109, Australia Search for other works by this author on: GSW Google Scholar David W. Scholl David W. Scholl 4Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Kent C. Condie † 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801, USA M.E. Bickford 2Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Richard C. Aster 1Department of Earth and Environmental Science, New Mexico Tech, Socorro, New Mexico 87801, USA Elena Belousova 3Department of Earth and Planetary Sciences, GEMOC, Macquarie University, Sydney, NSW 2109, Australia David W. Scholl 4Department of Geology and Geophysics, University of Alaska, Fairbanks, Alaska 99775, USA †E-mail: kcondie@nmt.edu Publisher: Geological Society of America Received: 31 May 2010 Revision Received: 31 Aug 2010 Accepted: 02 Sep 2010 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2011 Geological Society of America GSA Bulletin (2011) 123 (5-6): 951–957. https://doi.org/10.1130/B30344.1 Article history Received: 31 May 2010 Revision Received: 31 Aug 2010 Accepted: 02 Sep 2010 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Kent C. Condie, M.E. Bickford, Richard C. Aster, Elena Belousova, David W. Scholl; Episodic zircon ages, Hf isotopic composition, and the preservation rate of continental crust. GSA Bulletin 2011;; 123 (5-6): 951–957. doi: https://doi.org/10.1130/B30344.1 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 U/Pb detrital zircon ages from global modern river sediments define eight peak clusters centered at 2700, 2500, 2010, 1840, 1600, 1150, 600, and 300 Ma. These clusters extend vertically into both positive and negative εHf(T) space and are similar to those in orogenic granitoids that correlate well with supercontinent formation. We suggest that the clusters are preservation peaks that reflect juvenile and reworked continental crust selectively preserved during continental collisions. The greatest contribution of juvenile continental crust is associated with the 1600 and 1150 Ma clusters and may reflect a change in the style of collisional orogens in the Paleoproterozoic involving thicker and stronger lithosphere. Age gaps at 2400–2200, 1400–1300, 900–650, and 185–120 Ma represent times when crustal production and recycling rates were about the same. Although some new continental growth may occur during continental collisions, supercontinent assembly does not require an increase in production rate of continental crust. Rather, we suggest that the preservation rate increases by an increased probability of capture of both new and reworked continental crust in collisional orogens. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.