Portal de Periódicos da CAPES

Episodic overbank deposition as a dominant mechanism of floodplain and delta-plain aggradation

2015; Geological Society of America; Volume: 43; Issue: 10 Linguagem: Inglês

10.1130/g36847.1

1943-2682

Zhixiong Shen, Torbjörn E. Törnqvist, Barbara Mauz, Elizabeth L. Chamberlain, Austin Nijhuis, Laure Sandoval,

Coastal wetland ecosystem dynamics

Research Article| October 01, 2015 Episodic overbank deposition as a dominant mechanism of floodplain and delta-plain aggradation Zhixiong Shen; Zhixiong Shen 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA *Current address: Department of Marine Science, Coastal Carolina University, 301 Allied Drive, Conway, South Carolina 29526, USA; zshen@coastal.edu. Search for other works by this author on: GSW Google Scholar Torbjörn E. Törnqvist; Torbjörn E. Törnqvist 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Search for other works by this author on: GSW Google Scholar Barbara Mauz; Barbara Mauz 2School of Environmental Sciences, University of Liverpool, Liverpool L69 7ZT, UK Search for other works by this author on: GSW Google Scholar Elizabeth L. Chamberlain; Elizabeth L. Chamberlain 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Search for other works by this author on: GSW Google Scholar Austin G. Nijhuis; Austin G. Nijhuis 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA †Current address: Initiative for a Competitive Inner City, 184 Dudley Street, Boston, Massachusetts 02119, USA. Search for other works by this author on: GSW Google Scholar Laure Sandoval Laure Sandoval 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA §Current address: DASecurity, 1 Avenue d'Ester, 87069 Limoges Cedex, France. Search for other works by this author on: GSW Google Scholar Author and Article Information Zhixiong Shen *Current address: Department of Marine Science, Coastal Carolina University, 301 Allied Drive, Conway, South Carolina 29526, USA; zshen@coastal.edu. 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Torbjörn E. Törnqvist 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Barbara Mauz 2School of Environmental Sciences, University of Liverpool, Liverpool L69 7ZT, UK Elizabeth L. Chamberlain 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Austin G. Nijhuis †Current address: Initiative for a Competitive Inner City, 184 Dudley Street, Boston, Massachusetts 02119, USA. 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Laure Sandoval §Current address: DASecurity, 1 Avenue d'Ester, 87069 Limoges Cedex, France. 1Department of Earth and Environmental Sciences, Tulane University, 6823 St. Charles Avenue, New Orleans, Louisiana 70118-5698, USA Publisher: Geological Society of America Received: 02 Apr 2015 Revision Received: 28 Jul 2015 Accepted: 30 Jul 2015 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (10): 875–878. https://doi.org/10.1130/G36847.1 Article history Received: 02 Apr 2015 Revision Received: 28 Jul 2015 Accepted: 30 Jul 2015 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 Zhixiong Shen, Torbjörn E. Törnqvist, Barbara Mauz, Elizabeth L. Chamberlain, Austin G. Nijhuis, Laure Sandoval; Episodic overbank deposition as a dominant mechanism of floodplain and delta-plain aggradation. Geology 2015;; 43 (10): 875–878. doi: https://doi.org/10.1130/G36847.1 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 The common view that frequent overbank flooding leads to gradual aggradation of alluvial strata on floodplains and delta plains has been challenged by a variety of studies that suggest that overbank aggradation occurs in a strongly episodic fashion. However, this remains a largely untested hypothesis due to the difficulty in establishing age models with sufficiently high resolution. Here we use 39 optically stimulated luminescence (OSL) ages from proximal overbank deposits in the Mississippi Delta to demonstrate for the first time that alluvial aggradation over centennial to millennial time scales is predominantly episodic, with aggradation rates of 1–4 cm/yr that can persist for centuries. OSL ages from three separate study areas produce age clusters that are distinctly different yet complement each other. These findings suggest that a substantial portion of the continental stratigraphic record consists of patchworks of relatively discrete, centennial- to millennial-scale sediment bodies assembled by autogenic processes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.