Morphometry of Neogene mass transport deposits of the continental slopes of Cabo Frio High, frontier region of Santos and Campos basins

Abstract

Abstract This study examines the pattern and dimensions of Mass Transport Deposits (MTDs). Multichannel seismic samples data was used for describing the morphology of MTDs as well as the morphometric architecture and genesis of deposits. The study area is dominated by the strong halokinesis and flow of the Brazil Current and in between the Campos and Santos Basins (SW Atlantic upper slope). Results show that this area presents mass transport deposits over single and multiple events (i.e., Mass Transport Complex) deposited since the Neogene and extended throughout an area of nearly 68 km2. The majority of the MTDs are characterized by chaotic and/or transparent internal seismic facies, which it is interpreted as signs of slumps and debris flow deposits. Also, the combination of morphometric parameters and local geological controls allowed us to recognize the possible triggers. Although it cannot determine the exact triggering mechanisms, these deposits are related to local gravitational instabilities such as seismicity and diapir reactivation.