What could form a 35-km lineament of carbonate mounds on the ocean floor?

Raissa Basti Ramos, Uri Schattner, Francisco José Lobo, Mascimiliano Maly, Rodolfo Jasão Soares Dias, Orlemir Carerette, Paulo Yukio Gomes Sumida, Michel Michaelovitch de Mahiques

Research output: Contribution to journalArticlepeer-review

Abstract

A multibeam survey carried out in November 2019 reveals a lineament of seafloor protrusions on the Santos Basin (SW Atlantic) continental slope. Shallow seismic data and seafloor composition suggest the lineament comprises a 35 km long arrangement of Cold-Water Coral (CWC) carbonate mounds, here named the Tupana Carbonate Ridge (TCR), defined in this contribution for the first time. Insights into genetic controlling factors of the TCR led to the analysis of single-channel seismic profiles that cross the lineament. Interpretation of deep seismic reflection data suggests a stratigraphic control provided by the lateral arrangement of coastal deposits formed during the protracted progradation that characterized a significant portion of Santos Basin's depositional history. Coastal sandstones encased in low-angle shelf-margin progradational wedges constitute a potential hydrocarbon reservoir supplied by the flow of fluids toward the surface through vertical structures. The ultimate source of fluids seems to be provided by halokinetic movements on a region depleted of salts known as the Albian Gap domain. This work questions the role of seafloor hydrodynamics in shaping the TCR morphology by eroding the carbonate mounds and forming elongated contourite systems.

Original languageAmerican English
Article number106239
JournalMarine and Petroleum Geology
Volume152
DOIs
StatePublished - Jun 2023

Keywords

  • Carbonate mound
  • Countourites
  • Fluid flow
  • Salt tectonics
  • Santos Basin

All Science Journal Classification (ASJC) codes

  • Economic Geology
  • Geology
  • Geophysics
  • Oceanography
  • Stratigraphy

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