Quaternary submarine mass-transport complexes on the southern Continental Slope of Campos Basin characterized by AUV high frequency geophysical data

2015 ◽  
Author(s):  
Anderson Gomes de Almeida ◽  
Renato Oscar Kowsmann ◽  
Alberto Garcia Figueiredo
Keyword(s):  
Mass Transport ◽  
Continental Slope ◽  
High Frequency ◽  
Geophysical Data ◽  
Campos Basin

scholarly journals Investigation of a possible submarine landslide at the Var delta front (Nice continental slope, southeast France)

2010 ◽  
Vol 47 (4) ◽  
pp. 486-496 ◽  
Author(s):  
N. Sultan ◽  
B. Savoye ◽  
G. Jouet ◽  
D. Leynaud ◽  
P. Cochonat ◽  
...  
Keyword(s):  
Continental Slope ◽  
Progressive Failure ◽  
Shear Zones ◽  
Technical Note ◽  
Submarine Landslide ◽  
Geophysical Data ◽  
Submarine Landslides ◽  
Delta Front ◽  
Shallow Subsurface ◽  
Seismic Reflections

The Var prodelta progrades across a straight, narrow shelf (less than 2 km wide) with a very steep continental slope reaching locally more than 30°. Historically, the Var delta front is sadly famous for the 1979 catastrophic submarine landslide that resulted in several casualties and infrastructural damage. Geotechnical and geophysical investigations carried out in late 2007 to the east of the 1979 landslide scar provide evidence for the possible occurrence of a new important sedimentary collapse and submarine landslide. Geophysical data acquired in the area show the presence of several seafloor morphological steps rooted to shallow subsurface seismic reflections. Moreover, in situ piezocone measurements demonstrate the presence of several shear zones at the border of the shelf break at different depths below the seafloor. The aim of this technical note is to present and discuss acquired geotechnical and geophysical data in terms of failure mechanisms and submarine landslides. Both geophysical and geotechnical data suggest the start-up of a progressive failure mechanism and reveal the possible occurrence of a submarine landslide and the urgent need for mitigation procedures.

Four new species of Sabatieria Rouville, 1903 (Nematoda, Comesomatidae) from the Continental Slope of Atlantic Southeast

Zootaxa ◽  
2007 ◽  
Vol 1402 (1) ◽  
pp. 39 ◽  
Author(s):  
ALESSANDRA PRATES BOTELHO ◽  
MARIA CRISTINA DA SILVA ◽  
ANDRÉ MORGADO ESTEVES ◽  
VERÔNICA FONSÊCA-GENEVOIS
Keyword(s):  
New Species ◽  
Continental Slope ◽  
Rio De Janeiro ◽  
Distal Part ◽  
Maximum Diameter ◽  
Campos Basin ◽  
Tail Shape ◽  
Abundant Genus

Sabatieria is the most abundant genus along the Campos Basin, Rio de Janeiro (Brazil). Four new species of Sabatieria (Nematoda-Comesomatidae) from the Continental Slope of Atlantic Southeast are described. Sabatieria spiculata sp.nov. is characterized by the size of spicule and the presence of dorsal tooth ; S. paraspiculata sp. nov. by tail shape and the maximum diameter; S. bitumen sp. nov. by spicule shape with an arrow-like distal part and the S. subrotundicauda sp.nov. by a round tail and reflected ovary.

scholarly journals New records of Tindariopsis (Pelecypoda, Protobranchia) from Brazil - Campos Basin (off Rio de Janeiro)

2011 ◽  
Vol 11 (3) ◽  
pp. 423-429
Author(s):  
Natalia Pereira Benaim ◽  
Ricardo Silva Absalão
Keyword(s):  
Atlantic Ocean ◽  
Continental Slope ◽  
Type Species ◽  
New Records ◽  
First Record ◽  
Brazilian Coast ◽  
Surface Sculpture ◽  
Campos Basin ◽  
The Caribbean

As a part of the Environmental Characterization of the Campos Basin project, we obtained samples from the continental slope benthos. As a consequence, specimens of Tindariopsis aeolata (Dall, 1889) and Tindariopsis agathida (Dall, 1889) were found. These species show prodissoconch surface sculpture patterns that were never seen for species of Tindariopsis. The presence of this kind of sculpture in the type species of the genus, T. agathida, adds diagnostic characters to the genus. T. agathida and T. aeolata are typical from the Caribbean Realm (Guyana and Tobago). This is the first record of T. aeolata in the southernmost area of the Atlantic Ocean, and also the shallowest record (1000 m) for this species. With this finding of specimens from the Bacia de Campos, the distribution of T. agathida can now be extended in the Brazilian coast from 7º to 22º S.

Slumps Mass-Transport Deposits in the Brazilian Continental Margin Deep Water: Offshore Potiguar Basin, NE Brazil.

2020 ◽  
Author(s):  
Yoe Perez ◽  
Julia Fonseca ◽  
Helenice Vital ◽  
Andre Silva ◽  
David Castro
Keyword(s):  
Mass Transport ◽  
Continental Slope ◽  
Continental Margin ◽  
Deep Water ◽  
Negative Impact ◽  
Water Area ◽  
Passive Margin ◽  
Rift System ◽  
Potiguar Basin ◽  
Mass Transport Deposits

<p>The Brazilian Continental Margin (BEM) deep-water regions contain important geological features that need advance in their characterization. Mass-transport deposits (MTD) are important not only by their significance in the sedimentary but also because of their negative impact economically. A slump is a coherent mass of sediment that moves on a concave-up glide plane and undergoes rotational movements causing internal deformation and one of the basic types of MTD. The study area comprises part of the offshore Potiguar Basin in NE Brazil, on the distal eastern portion of the Touros High and Fernando de Noronha Ridge. This portion of the Potiguar Basin comprises a transform rift system that has evolved into a continental passive margin. This basin represents an important location related to the breakup between South America and Africa. The database used in this work included 2D post-stack time-migrated seismic profiles from the Brazilian Agency of Petroleum, Natural Gas, and Biofuels (ANP). The slumps reflectors are identified on the continental shelf profiles in form of present clinoform configuration, medium to high continuity, high amplitudes, and medium to high frequencies, representing a sigmoidal oblique complex prograding reflector. The slump scars at the continental slope indicate that this is a gravitationally unstable area that will eventually collapse, resulting in erosional features on the continental slope and deposition on the continental rise. Our results provide some insights regarding MDT slumps sedimentary evolution in the BEM deep water area as well as their interrelation with other sedimentary deposits.</p>

scholarly journals Deep sea Caridea (Crustacea, Decapoda) from Campos Basin, RJ, Brazil

2007 ◽  
Vol 55 (1) ◽  
pp. 39-50 ◽  
Author(s):  
Irene A. Cardoso ◽  
C. S. Serejo
Keyword(s):  
Continental Slope ◽  
Deep Sea ◽  
New Record ◽  
Campos Basin

During the Campos Basin Deep Sea Environmental Project coordinated by CENPES/PETROBRAS two collecting campaigns were performed. Both used the N/RB Astrogaroupa and fishery nets to collect samples from the continental slope in Campos Basin, RJ (21º48'S to 22º48'S). Campaign Oceanprof I occurred in February, 2003 and collected 18 samples at depths between 1074 and 1649 m. Oceanprof II occurred in August, 2003 and collected 22 samples at depths between 1059 and 1640 m. A total of 14 caridean species were collected: Parapontophilus sp. (Crangonidae); Glyphocrangon longirostris (Smith, 1882) (Glyphocrangonidae); Lebbeus sp. (Hippolytidae); Nematocarcinus ensifer (Smith, 1882) (Nematocarcinidae); Acanthephyra eximia Smith, 1884; A. quadrispinosa Kemp, 1939; A. stylorostratis (Bate, 1888); Janicella spinicauda (A. Milne Edwards, 1883); Meningodora vesca (Smith, 1887); Notostomus elegans A. Milne Edwards, 1881; Oplophorus spinosus (Brullé, 1839); and Systellaspis debilis (A. Milne Edwards, 1881) (Oplophoridae); Heterocarpus inopinatus Tavares, 1999 and Plesionika sp. (Pandalidae). Three out of these 14 species, Parapontophilus sp., Lebbeus sp. and Plesionika sp. are still under investigation and were not included in the present study. From the 11 species identified Nematocarcinus ensifer is a new record for the Brazilian continental slope.

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