Coarse-grained sediment waves in hyperpycnal clinoform systems, Miocene of the Austral foreland basin, Argentina
2011; Geological Society of America; Volume: 39; Issue: 8 Linguagem: Inglês
10.1130/g31939.1
ISSN1943-2682
AutoresJuan José Ponce, Noelia B. Carmona,
Tópico(s)Paleontology and Stratigraphy of Fossils
ResumoResearch Article| August 01, 2011 Coarse-grained sediment waves in hyperpycnal clinoform systems, Miocene of the Austral foreland basin, Argentina Juan José Ponce; Juan José Ponce * Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Isidro Lobo y Belgrano (8332) General Roca, Río Negro, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina *E-mail: ponce_juanjose@yahoo.com.ar. Search for other works by this author on: GSW Google Scholar Noelia Carmona Noelia Carmona Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Isidro Lobo y Belgrano (8332) General Roca, Río Negro, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina Search for other works by this author on: GSW Google Scholar Author and Article Information Juan José Ponce * Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Isidro Lobo y Belgrano (8332) General Roca, Río Negro, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina Noelia Carmona Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Isidro Lobo y Belgrano (8332) General Roca, Río Negro, Argentina, and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina *E-mail: ponce_juanjose@yahoo.com.ar. Publisher: Geological Society of America Received: 24 Nov 2010 Revision Received: 15 Mar 2011 Accepted: 21 Mar 2011 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2011 Geological Society of America Geology (2011) 39 (8): 763–766. https://doi.org/10.1130/G31939.1 Article history Received: 24 Nov 2010 Revision Received: 15 Mar 2011 Accepted: 21 Mar 2011 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 Juan José Ponce, Noelia Carmona; Coarse-grained sediment waves in hyperpycnal clinoform systems, Miocene of the Austral foreland basin, Argentina. Geology 2011;; 39 (8): 763–766. doi: https://doi.org/10.1130/G31939.1 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 In this paper we present an outcrop example of coarse-grained sediment waves generated by hyperpycnal discharges at the toe of Miocene clinoform systems exposed in the northeast Atlantic coast of Tierra del Fuego, Argentina. An individual set of these sediment waves is formed during the waxing and waning phases of the hyperpycnal discharge. During the waxing phase, accumulation of coarse-grained sediments with generation and migration of dune bedforms occurs at the base of the clinoforms. These deposits show transitions of tractive sedimentary structures with evidence of bedload transport, and a continuous reworking by the overpassing hyperpycnal flow. The continued erosion and reworking during the waxing phase affect mainly the top and the stoss side of the dunes, resulting in isolated lenses having upcurrent aggradation structures. During the waning phase, these isolated lenses are covered by fine-grained heterolithic strata that are thicker on the stoss side than on the lee side, constituting a differential draping. The pulsating and sustained character of the hyperpycnal flows and the steep depositional slope clinoforms controlled the stacking pattern of the coarse-grained sediment waves during successive hyperpycnal events. In this way, small-scale, coarse-grained sediment waves, with wavelengths of 10–40 m and up to 5 m amplitude, and a stacking pattern showing an up-current growth, are generated by high-density hyperpycnal flows on slopes having steep gradients. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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