Hemipelagites, hemiturbidites or muddy contourites? The contribute of magnetic fabric analysis to discriminate depositional mechanisms in fine-grained sediments (Marnoso Arenacea Fm., Miocene, northern Italy)

• Eleonora Dall'Olio ^[1] ; Fabrizio Felletti ^[1] ; Giovanni Muttoni ^[1]
  1. [1] University of Milan

     University of Milan

     Milán, Italia

     
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 11, 2010 (Ejemplar dedicado a: Deep-Water Circulation: Processes & Products. International Congress. Baitona, Pontevedra, Spain. 16 & 17 June 2010), págs. 31-32
• Idioma: inglés
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• Resumen

  • Anisotropy of the Magnetic Susceptibility (AMS) has been used for discriminating different deep-water sedimentation processes (i.e. turbidite current, bottom-current, hemipelagic settling) in fine-grained sediments.This study suggests that fine-grained ‘non-turbiditic’ deposits of the Marnoso-Arenacea Fm. (hemipelagites afterRicci Lucchi and Valmori, 1980) cannot be explained considering simply hemipelagic settling of deep-sea mud. Weinfer that such beds were essentially deposited from stationary NW-SE bottom currents, parallel to the main basin-axis, although a continuum may exist between dilute hemipelagic settling, turbidity flows and bottom currents.