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Quantitative Analysis of Submarine-Flow Deposit Shape In the Marnoso-Arenacea Formation: What Is the Signature of Hindered Settling From Dense Near-Bed Layers?

2015; Society for Sedimentary Geology; Volume: 85; Issue: 2 Linguagem: Inglês

10.2110/jsr.2015.15

1938-3681

G. Malgesini, Peter J. Talling, Andrew J. Hogg, David Armitage, A. Goater, F. Felletti,

Geology and Paleoclimatology Research

Research Article| February 01, 2015 Quantitative Analysis of Submarine-Flow Deposit Shape In the Marnoso-Arenacea Formation: What Is the Signature of Hindered Settling From Dense Near-Bed Layers? Giuseppe Malgesini; Giuseppe Malgesini 1 National Oceanography Centre, European Way, Southampton, SO14 3ZH, U.K. 2 Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Mangiagalli 34, 20133-Milano, Italy e-mail: giuseppe.malgesini@gmail.com Search for other works by this author on: GSW Google Scholar Peter J. Talling; Peter J. Talling 1 National Oceanography Centre, European Way, Southampton, SO14 3ZH, U.K. Search for other works by this author on: GSW Google Scholar Andrew J. Hogg; Andrew J. Hogg 4 Centre for Environmental & Geophysical Flows, School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, U.K. Search for other works by this author on: GSW Google Scholar Dominic Armitage; Dominic Armitage 3 ConocoPhillips, Sedimentology and Stratigraphy, Houston, Texas 77079, U.S.A. Search for other works by this author on: GSW Google Scholar Alex Goater; Alex Goater 4 Centre for Environmental & Geophysical Flows, School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, U.K. Search for other works by this author on: GSW Google Scholar Fabrizio Felletti Fabrizio Felletti 2 Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Mangiagalli 34, 20133-Milano, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Giuseppe Malgesini 1 National Oceanography Centre, European Way, Southampton, SO14 3ZH, U.K. 2 Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Mangiagalli 34, 20133-Milano, Italy Peter J. Talling 1 National Oceanography Centre, European Way, Southampton, SO14 3ZH, U.K. Andrew J. Hogg 4 Centre for Environmental & Geophysical Flows, School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, U.K. Dominic Armitage 3 ConocoPhillips, Sedimentology and Stratigraphy, Houston, Texas 77079, U.S.A. Alex Goater 4 Centre for Environmental & Geophysical Flows, School of Mathematics, University of Bristol, University Walk, Bristol BS8 1TW, U.K. Fabrizio Felletti 2 Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Mangiagalli 34, 20133-Milano, Italy e-mail: giuseppe.malgesini@gmail.com Publisher: SEPM Society for Sedimentary Geology Received: 17 Dec 2012 Accepted: 07 Nov 2014 First Online: 09 Mar 2017 Online ISSN: 1938-3681 Print ISSN: 1527-1404 Copyright © 2015 SEPM (Society for Sedimentary Geology) Journal of Sedimentary Research (2015) 85 (2): 170–191. https://doi.org/10.2110/jsr.2015.15 Article history Received: 17 Dec 2012 Accepted: 07 Nov 2014 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 Giuseppe Malgesini, Peter J. Talling, Andrew J. Hogg, Dominic Armitage, Alex Goater, Fabrizio Felletti; Quantitative Analysis of Submarine-Flow Deposit Shape In the Marnoso-Arenacea Formation: What Is the Signature of Hindered Settling From Dense Near-Bed Layers?. Journal of Sedimentary Research 2015;; 85 (2): 170–191. doi: https://doi.org/10.2110/jsr.2015.15 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 SocietyJournal of Sedimentary Research Search Advanced Search Abstract: Submarine sediment density flows are one of the volumetrically most important processes for sediment transport across Earth. The sediment concentration of flows that reach the deep ocean has never been measured directly, and understanding these long-runout flows remains a major challenge. The Miocene Marnoso-Arenacea Formation in the Italian Apennines is the only ancient sequence where individual submarine sediment-density-flow deposits (single beds) have been mapped out for more than 100 km down-flow. Here we document the external shape and internal architecture of thirty-two individual beds that record flow evolution and can be compared to deposit shapes in mathematical or experimental models. The large number of beds allows modes of flow behavior to be identified. Larger-volume turbidites are typically dominated by massive (TA) or planar-laminated (TB) sandstone intervals that have a broad thickness maximum. This shape is important because it suggests that massive and planar laminated sandstones record hindered settling from dense near-bed layers, which have high (> 10% by volume) sediment concentrations. Previously, some authors have inferred that planar-laminated sandstones (TB) are deposited mainly by dilute flows. The position of the broad thickness maximum moves basinward as the volume of sand in the flow increases. This is consistent with mathematical modeling that suggests the position of the thickness maximum depends on flow thickness, flow speed, and sediment settling velocity, as well as sediment concentration, variations in seawater entrainment rate, and local changes in seafloor gradient. Smaller-volume turbidite sandstone intervals are finer grained and dominated by ripple cross-lamination (TC) and have a near exponential decay in thickness that is consistent with deposition from a dilute sediment suspension. The rate of near exponential thinning is controlled by sandstone volume. In contrast, turbidite mudstone intervals show an approximately linear increase in thickness with distance. Flows that entered the basin in opposite directions produced turbidite mudstone intervals that thicken towards the same location, indicating that muddy turbidity currents can drain back over long distances to basinal lows. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.