Contourites and gravity deposits of Faro Drift (Gulf of Cadiz)sediment provenance

  1. Belén Alonso 1
  2. Gemma Ercilla 1
  3. D. Casas 2
  4. D.A.W. Stow 3
  5. F.J. Rodríguez Tovar 4
  6. J. Dorador 4
  7. F.J. Hernández Molina 5
  1. 1 Instituto de Ciencias del Mar, Continental Margins Group, CSIC
  2. 2 Instituto Geológico y Minero de España
    info

    Instituto Geológico y Minero de España

    Madrid, España

    ROR https://ror.org/04cadha73

  3. 3 Institute of Petroleum Engineering, Heriot-Watt University, Edinburgh
  4. 4 Universidad de Granada
    info

    Universidad de Granada

    Granada, España

    ROR https://ror.org/04njjy449

  5. 5 Dept. Earth Sciences, Royal Holloway Univ. London, Egham, Surre
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Journal:
Geotemas (Madrid)

ISSN: 1576-5172

Year of publication: 2016

Issue Title: IX CONGRESO GEOLÓGICO DE ESPAÑA

Issue: 16

Pages: 583-586

Type: Article

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Abstract

ThePleistocene deposits of the Faro Drift at sites U1386 and U1387 with IODP 339 Exp. 339 have been examined to characterize: a) their lithofacies, b) for identifying the most used useful criteria for distinguishing between contourites and gravity flow deposits, and c) to determinate the sediment provenance. Three lithofacies, contourites, turbidites and debrites are defined based on sedimentological and mineralogical results. The most useful criteria for distinguishing between these two deposits are: i) the grain size vertical trend and sedimentary structures; ii) the modal frequency distribution, and iii) the sediment composition. Interpretation of sediment provenance of the different lithofacies reflects modes of long- and short-distance transport. Most of the terrigenous sediment of contourites is coming from the distant Guadalquivir drainage basin whereas those terrigenous sediment of turbidites and debrites are sourced by the vicinity fluvial drainage basins, Guadiana and Tinto-Odiel and biogenous components indicating shallow marine depositional environments.

Data source: Dialnet