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External controls on modern clastic turbidite systems : three case studies

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Abstract
Three case studies are used to exemplify the wide variety of controlling factors that combine to influence the development of modern turbidite systems, and how these vary with location and time. For example, Cascadia Basin in the Pacific Ocean off western North America, which is underlain by the Cascadia Subduction Zone, exhibits the dominant tectonic control of earthquake triggering for turbidity currents, the increased sediment-supply effects of the Mt. Mazama catastrophic volcanic eruption in 7626 yr B.P., the glacial climatic and sea-level lowstand control on rapid turbidite-system growth rates, and the recent anthropogenic control that reduces sediment supply rates. Lake Baikal in Russia shows how the rift-basin tectonic setting controls the number and type of sediment input points, the amount of sediment supply, and the consequent types of turbidite systems developed along different margins of the Baikal basin. Pleistocene glacial climatic changes, without changes in lake base level, causes increased sediment input and the rapid growth rate of Baikal turbidite systems that is three to five times greater than that during the Holocene interglacial climate. The Ebro turbidite systems in the northwest Mediterranean Sea exhibit control of system types by the Messinian salinity-crisis lowstand, of channel locations by oceanographic current patterns, and of sediment-supply increase by glacial climatic changes as well as recent decrease by anthropogenic changes. Both active-margin and passive-margin settings have some common controls such as climatic and sea-level changes, and develop similar types of turbidite systems such as base-of-slope aprons, submarine fans, and deep-sea or axial channels. Each margin also has specific local controlling factors, for example the volcanic events in Cascadia Basin, glacial climatic without erosional base-level control in Lake Baikal, and the Messinian extreme lowstand in the Mediterranean Sea. Comparison of modern turbidite systems points out new insights on external controls such as importance of: (1) earthquakes for triggering turbidity currents on active tectonic margins, (2) equal or greater Pleistocene climatic control compared to lowered base level for sediment supply, (3) direct glacial sediment input that results in doubled proximal channel size, (4) greatly reduced deposition rates in drained compared to ponded turbidite basins, (5) importance of ocean currents on location of turbidite systems and channel development, and (6) anthropogenic effects from river damming during the last century that sometimes reduces present sediment supply to turbidite systems by orders of magnitude.
Keywords
Cascadia Basin, Lake Baikal, turbidite systems, Ebro, external and local controls

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Chicago
Nelson, C Hans, Carlota Escutia, Chris Goldfinger, Eugene Karabanov, Julia Gutierrez-Pastor, and Marc De Batist. 2009. “External Controls on Modern Clastic Turbidite Systems : Three Case Studies.” In Society for Sedimentary Geology Special Publication, ed. BC Kneller, Ole J Martinsen, and Bill McCaffrey, 92:57–76. Tulsa, OK, USA: Society for Sedimentary Geology (SEPM).
APA
Nelson, C. H., Escutia, C., Goldfinger, C., Karabanov, E., Gutierrez-Pastor, J., & De Batist, M. (2009). External controls on modern clastic turbidite systems : three case studies. In B. Kneller, O. J. Martinsen, & B. McCaffrey (Eds.), Society for Sedimentary Geology Special Publication (Vol. 92, pp. 57–76). Presented at the SEPM-GSL joint research conference : External controls on deep-water depositional systems : climate, sea level, and sediment flux, Tulsa, OK, USA: Society for Sedimentary Geology (SEPM).
Vancouver
1.
Nelson CH, Escutia C, Goldfinger C, Karabanov E, Gutierrez-Pastor J, De Batist M. External controls on modern clastic turbidite systems : three case studies. In: Kneller B, Martinsen OJ, McCaffrey B, editors. Society for Sedimentary Geology Special Publication. Tulsa, OK, USA: Society for Sedimentary Geology (SEPM); 2009. p. 57–76.
MLA
Nelson, C Hans, Carlota Escutia, Chris Goldfinger, et al. “External Controls on Modern Clastic Turbidite Systems : Three Case Studies.” Society for Sedimentary Geology Special Publication. Ed. BC Kneller, Ole J Martinsen, & Bill McCaffrey. Vol. 92. Tulsa, OK, USA: Society for Sedimentary Geology (SEPM), 2009. 57–76. Print.
@inproceedings{1082934,
  abstract     = {Three case studies are used to exemplify the wide variety of controlling factors that combine to influence the development of modern turbidite systems, and how these vary with location and time. For example, Cascadia Basin in the Pacific Ocean off western North America, which is underlain by the Cascadia Subduction Zone, exhibits the dominant tectonic control of earthquake triggering for turbidity currents, the increased sediment-supply effects of the Mt. Mazama catastrophic volcanic eruption in 7626 yr B.P., the glacial climatic and sea-level lowstand control on rapid turbidite-system growth rates, and the recent anthropogenic control that reduces sediment supply rates. Lake Baikal in Russia shows how the rift-basin tectonic setting controls the number and type of sediment input points, the amount of sediment supply, and the consequent types of turbidite systems developed along different margins of the Baikal basin. Pleistocene glacial climatic changes, without changes in lake base level, causes increased sediment input and the rapid growth rate of Baikal turbidite systems that is three to five times greater than that during the Holocene interglacial climate. The Ebro turbidite systems in the northwest Mediterranean Sea exhibit control of system types by the Messinian salinity-crisis lowstand, of channel locations by oceanographic current patterns, and of sediment-supply increase by glacial climatic changes as well as recent decrease by anthropogenic changes.
Both active-margin and passive-margin settings have some common controls such as climatic and sea-level changes, and develop similar types of turbidite systems such as base-of-slope aprons, submarine fans, and deep-sea or axial channels. Each margin also has specific local controlling factors, for example the volcanic events in Cascadia Basin, glacial climatic without erosional base-level control in Lake Baikal, and the Messinian extreme lowstand in the Mediterranean Sea. Comparison of modern turbidite systems points out new insights on external controls such as importance of: (1) earthquakes for triggering turbidity currents on active tectonic margins, (2) equal or greater Pleistocene climatic control compared to lowered base level for sediment supply, (3) direct glacial sediment input that results in doubled proximal channel size, (4) greatly reduced deposition rates in drained compared to ponded turbidite basins, (5) importance of ocean currents on location of turbidite systems and channel development, and (6) anthropogenic effects from river damming during the last century that sometimes reduces present sediment supply to turbidite systems by orders of magnitude.},
  author       = {Nelson, C Hans and Escutia, Carlota and Goldfinger, Chris and Karabanov, Eugene and Gutierrez-Pastor, Julia and De Batist, Marc},
  booktitle    = {Society for Sedimentary Geology Special Publication},
  editor       = {Kneller, BC and Martinsen, Ole J and McCaffrey, Bill},
  isbn         = {9781565761360},
  issn         = {1060-071X},
  keywords     = {Cascadia Basin,Lake Baikal,turbidite systems,Ebro,external and local controls},
  language     = {eng},
  location     = {London, UK},
  pages        = {57--76},
  publisher    = {Society for Sedimentary Geology (SEPM)},
  title        = {External controls on modern clastic turbidite systems : three case studies},
  volume       = {92},
  year         = {2009},
}

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