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From sediments to their source rocks: Hf and Nd isotopes in recent river sediments

2011; Geological Society of America; Volume: 39; Issue: 4 Linguagem: Inglês

10.1130/g31785.1

1943-2682

Bruno Dhuime, Chris Hawkesworth, Craig Storey, Peter A. Cawood,

Geological formations and processes

Research Article| April 01, 2011 From sediments to their source rocks: Hf and Nd isotopes in recent river sediments Bruno Dhuime; Bruno Dhuime * 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK *E-mail: B.Dhuime@bristol.ac.uk. Search for other works by this author on: GSW Google Scholar C.J. Hawkesworth; C.J. Hawkesworth 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK Search for other works by this author on: GSW Google Scholar C.D. Storey; C.D. Storey 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK3School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK Search for other works by this author on: GSW Google Scholar Peter A. Cawood Peter A. Cawood 2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK4School of Earth and Environment, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Bruno Dhuime * 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK C.J. Hawkesworth 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK C.D. Storey 1Department of Earth Sciences, University of Bristol, Wills Memorial Building, Queens Road, Bristol BS8 1RJ, UK3School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth PO1 3QL, UK Peter A. Cawood 2Department of Earth Sciences, University of St. Andrews, North Street, St. Andrews KY16 9AL, UK4School of Earth and Environment, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia *E-mail: B.Dhuime@bristol.ac.uk. Publisher: Geological Society of America Received: 24 Sep 2010 Revision Received: 25 Nov 2010 Accepted: 03 Dec 2010 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (4): 407–410. https://doi.org/10.1130/G31785.1 Article history Received: 24 Sep 2010 Revision Received: 25 Nov 2010 Accepted: 03 Dec 2010 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Bruno Dhuime, C.J. Hawkesworth, C.D. Storey, Peter A. Cawood; From sediments to their source rocks: Hf and Nd isotopes in recent river sediments. Geology 2011;; 39 (4): 407–410. doi: https://doi.org/10.1130/G31785.1 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 Unraveling continental evolution from the sedimentary record requires an understanding of time-integrated erosion laws that link sediments to their source rocks, and the extent to which erosion laws vary in different erosion systems. Detrital zircons from the Frankland River (southwestern Australia) define a continental growth curve that is strikingly similar to the Nd in shales curve for the Australian continent. This suggests that the detrital zircon data can be used as a good proxy for the sedimentary record through time. The advantage is that the age distribution of the zircons allows the contributions from different source regions to be determined for any sediment sample. Using integrated Hf and U-Pb isotopes in detrital zircons, and Nd isotope ratios of bulk recent sediments along the Frankland River, the relative contributions of different source terrains have been determined and expressed through an erosion parameter K, which relates the proportions of the material from different source rocks in the sediments to the proportions of those source rocks present in the overall catchment of the sediments analyzed. The results suggest that values of K = 4–6 are representative of mature river systems that sample large source areas, and that these should be used to reevaluate models of the evolution of the continental crust that were generally limited by the assumption of K. For the Gondwana supercontinent, K values of 4–6 indicate that at least 50% of the present-day volume of the continental crust was generated by the end of the Archean. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.