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Quaternary seismic stratigraphy of the deep depositional systems in the Cantabrian margin

AuthorsIglesias, Jorge ; Ercilla, Gemma ; García-Gil, Soledad
Very high-resolution seismic stratigraphy
Cantabrian margin
Deep depositional systems
Issue Date11-Apr-2012
CitationXIII International Symposium on Oceanography of the Bay of Biscay. ISOBAY 13. Book of abstracts: 27 (2012)
AbstractA very high-resolution seismic stratigraphy of the Cantabrian margin has been defined based on TOPAS (Parametric echosounder). Two seismic sequences, A1b (from the base of the Quaternary –BQD – at ca. 2.6 Ma to Middle Pleistocene Revolution –MPR– ca. 0-9 Ma ) and A1a (from MPR to present) divided into minor order seismic units and subunits, have been characterized in all sedimentary systems making up the continental slope and rise. Those stratigraphic divisions and seismic facies analysis together with the geo-history framework, have allowed reconstructing the Quaternary sedimentary evolution of this margin, in terms of activity of sedimentary processes and their relationship with global climate and sea-level changes and local oceanography. Two major periods separated by the MPR and coincident with the A1b and A1a sequences, have been established. During the first period the predominance of 40 kyr frequency and low amplitude glacio-eustatic oscillations were responsible for poorly starved deep environments with eventual muddy gravitative flows of low density and low erosive character. During the second period, the predominance of 100 kyr and higher amplitude (100–120 m) glacio-eustatic changes have favoured an extensive sedimentation characterized by the alternation of fine to coarse gravitative flows of high density and high erosive character. The minor hierarchy seismic divisions, units and subunits, can be associated each one to an entire cycle of sea level change, though in a different order, higher than 40 kyr and 100 kyr
DescriptionXIII International Symposium on Oceanography of the Bay of Biscay. ISOBAY 13, 11-13 April 2012, Santander, Spain
Publisher version (URL)http://www.ieo-santander.net/isobay13/program.php
Appears in Collections:(ICM) Comunicaciones congresos
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