Deep pockmarks as natural sediment traps: a case study from southern Santos Basin (SW Atlantic upper slope)

Raíssa Basti Ramos, Rosangela Felicio dos Santos, Uri Schattner, Rubens Cesar Lopes Figueira, Marcia Caruso Bícego, Francisco José Lobo, Michel Michaelovitch de Mahiques

Research output: Contribution to journalArticlepeer-review

Abstract

This study examines the role of deep pockmarks in acting as natural sediment traps. Multibeam bathymetry, single-channel seismic and sediment samples data were used for describing the morphology of pockmarks as well as the nature of sediments inside and outside these depressed features, in an area of Santos Basin (SW Atlantic upper slope), dominated by the strong flow of Brazil Current. Results show that the grain size and chemical composition of sediments inside pockmarks are distinct from the outside. Also, radiocarbon dating shows that Holocene ages are found only in samples located inside the pockmarks. Combination of sedimentological, geochemical and geochronological data allowed to recognise that deep pockmarks might present distinct sediment deposition processes when compared with those of shallow pockmarks, in which turbulence impedes sediment deposition, as reported in the literature.

Original languageEnglish
Pages (from-to)989-999
Number of pages11
JournalGeo-Marine Letters
Volume40
Issue number6
DOIs
StatePublished - Dec 2020

Bibliographical note

Funding Information:
The authors acknowledge the crew and researchers of the two surveys held in 2016 and 2017, onboard R.V. Alpha Crucis. The São Paulo Science Foundation (FAPESP, grants 2014/08266-2, 2016/22194-7 and 2015/17763-2) funded this work. Partnerships between MM.de M., U.S. and F.L-S., are funded by FAPESP (grant 2017/50191-8) and the Brazilian National Research Council (CNPq, grant 401041/2014-0), respectively. M.M.de M. acknowledges CNPq for the research grants 303132/2014-0 and 300962/2018-5. This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001 (R.B.R. MSc. Scholarship).

Funding Information:
The authors acknowledge the crew and researchers of the two surveys held in 2016 and 2017, onboard R.V. Alpha Crucis. The S?o Paulo Science Foundation (FAPESP, grants 2014/08266-2, 2016/22194-7 and 2015/17763-2) funded this work. Partnerships between MM.de M., U.S. and F.L-S., are funded by FAPESP (grant 2017/50191-8) and the Brazilian National Research Council (CNPq, grant 401041/2014-0), respectively. M.M.de M. acknowledges CNPq for the research grants 303132/2014-0 and 300962/2018-5. This study was financed in part by the Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior ? Brasil (CAPES) ? Finance Code 001 (R.B.R. MSc. Scholarship).

Publisher Copyright:
© 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

ASJC Scopus subject areas

  • Oceanography
  • Environmental Science (miscellaneous)
  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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