Structure Of The Offshore Sinu Accretionary Wedge. Northern Colombia

Flinch, Joan; Amaral, J.; Doulcet, A.; Mouly, B.; Osorio, C.; Pince, J. M.

doi:10.3997/2214-4609-pdb.33.paper8

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…However, this interpretation suggests the occurrence of a WNW‐ESE trending fault (i.e., Canoas Fault in Ruiz et al, ) as the northern termination of the SFB and the locus of this right‐lateral transfer zone. However, further studies have not shown any structural evidence to support the occurrence of this fault, nor does it explain how this displacement is transferred toward the east (Flinch et al, ; Romero, ). More recently, studies using high‐quality bathymetry data (Romero, ) have found a NE‐SW trending escarpment parallel to the shoreline in the area immediately inboard of main Magdalena Fan (dashed line on Figure ) .…”

Section: Discussionmentioning

confidence: 99%

Basin Evolution and Shale Tectonics on an Obliquely Convergent Margin: The Bahia Basin, Offshore Colombian Caribbean

Galindo

Lonergan

2020

Tectonics

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Oblique convergent margins accumulate strike-slip deformation that controls basin formation and evolution. The Bahia Basin is located offshore, proximal to major strike-slip fault systems that affect northern Colombia. It lies behind the toe of the modern accretionary prism, where the Caribbean Plate is being subducted obliquely beneath South America. This is the first attempt using 3-D seismic reflection data to interpret a complex strike-slip basin at the western end of the southern margin of the Caribbean Plate. Detailed 2-D and 3-D seismic mapping of regional unconformities and faults is used to describe the structural geometry, timing, and evolution of extensional and strike-slip faults, which controlled the formation of the basin. Analysis of the fault zones is coupled with a description of the seismic-stratigraphic units observed within the Bahia Basin to reconstruct the spatial and temporal evolution of deformation and to evaluate the influence of the pervasive shale tectonics observed in the area. The results, presented as a series of structural-paleogeographic maps, illustrate an initial stage of transtension that controlled the formation of shale-withdrawal minibasins from late Oligocene to late Miocene times. The continuous deformation and northward expulsion of the Santa Marta Massif resulted in transpression during Pliocene times, leading to basin inversion and ultimate closure of the basin. Basin evolution along the southern Caribbean oblique, convergent margin, shows the occurrence of a complex interaction between subduction and major-onshore strike-slip fault systems and illustrates how strain-partitioning led to the break-up and lateral displacement of early accretionary prisms formed along the margin.

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Section: Discussionmentioning

confidence: 99%

Basin Evolution and Shale Tectonics on an Obliquely Convergent Margin: The Bahia Basin, Offshore Colombian Caribbean

Galindo

Lonergan

2020

Tectonics

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“…The study area (Figure 1) is located in the south west of the South Caribbean Deformed Belt (SCDB), in a zone dominated by the Southern Sinú Fold Belt (SSFB) (Martinez et al, 2015) which is classified as an Accretionary Prism (Ruiz et al, 2000;Bernal-Olaya et al, 2015) and extends from the Urabá Gulf, in the South, to the Santa Marta Offshore region in the North (Flinch et al, 2003).The SCDB is the product of the obliquely collision between the Caribbean plate and the North Andes Plate (Pindell, 1994;Martinez et al, 2015). The Caribbean plate moves easterly and is subducted beneath the North Andes plate (Pindell, 1994;Symithe et al, 2015).…”

Section: Regional Settingmentioning

confidence: 99%

“…In Terrain T1, the absence of observable landslides would suggest that this terrain type is a low landslide risk area. The slow slope angle in the bathymetry (<2°) is the result of the high rate of sediments supplied by the Magdalena River that feeds channel-levees, in the continental slope, and smooth the marine relief in the abyssal basin ( Flinch et al, 2003;Naranjo-Vesga et al, 2020).…”

Section: Relation Between Terrain Types and Landslidesmentioning

confidence: 99%

Identification of submarine landslides in the Colombian Caribbean Margin (Southern Sinú Fold Belt) using seismic investigations

et al. 2021

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Submarine landslides can be triggered by several processes and involve a variety of mechanisms. These phenomena are important sediment transport processes, but they also constitute a significant geohazard. Mapping of the southwestern Caribbean Sea using 3D seismic data has allowed identification of several submarine landslides in the Colombian Margin in the area dominated by the Southern Sinú Fold Belt (SSFB). A poststack depth-migrated seismic cube survey with a 12.5 by 12.5 m bin spacing was used to identify landslides in an area covering 5746 km2. Landslides were interpreted using a seafloor morphologic parameter identification process and the internal deformation of the slope-forming material, as seen from seismic data. A total of 93 landslides were identified and classified based on their movement styles as follows: 52 rotational, 29 translational, and 12 complex landslides. In addition, 12 distinct deformational zones and a zone of mass transport complex (MTC) were identified. Five different ground condition terrains were interpreted based on landslide type and distribution as well as in geologic structures and seismic reflection analysis. Two main processes seem to influence landslides in the study area. First is the folding and faulting involved in the SSFB evolution. This process results in oversteepened slopes that start as deformational zones and then fail as translational or rotational slides. Those individual landslides progressively become complex landslide zones that follow geologic structural orientation. Second is the continental shelf break erosion by debris flows, which fills in intraslope subbasins and continental rise with several MTCs. According to the results, risk of damage by landslides increases in distances shorter than 4 km along structural ridge foothills in the study zone.

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“…1A). The geological evolution of northwestern South America is linked to the subduction of the Caribbean oceanic plate beneath the continental South American plate, which began in the late Cretaceous and continues today (Barat et al, 2014;Bernal-Olaya et al, 2015;Cortés and Angelier, 2005;Escalona and Mann, 2011;Flinch et al, 2003;Spikings et al, 2015;Taboada et al, 2000). Currently, the Caribbean plate maintains an eastward motion relative to the South American plate (Symithe et al, 2015).…”

Section: Geotectonic Settingmentioning

confidence: 99%

“…The southern area of the SCDB corresponds to the Sinú Fold Belt, a late Cenozoic sedimentary accretionary prism that is constrained to the east by the Sinú lineament (Duque-Caro, 1990, 1979Martinez et al, 2015;Ruiz et al, 2000). Uplift and deformation began during late Cenozoic and continues at present (Bernal-Olaya et al, 2015;Cediel et al, 2005;Corredor, 2003;Cortés and Angelier, 2005;Duque-Caro, 1990, 1979, with a main deformation stage that occurred during the Pliocene-Pleistocene, associated with the Andean Orogeny (Duque-Caro, 1979;Flinch et al, 2003;Ruiz et al, 2000). The Magdalena Submarine Fan, where the slope appears relatively undeformed, segments the Sinú fold belt into a Southern and a Northern portion (Fig.…”

Section: Geotectonic Settingmentioning

confidence: 99%

Regional controls in the distribution and morphometry of deep-water gravitational deposits along a convergent tectonic margin. Southern Caribbean of Colombia

Naranjo-Vesga

Ortiz-Karpf

Wood

et al. 2020

Marine and Petroleum Geology

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Structure Of The Offshore Sinu Accretionary Wedge. Northern Colombia

Cited by 6 publications

References 4 publications

Basin Evolution and Shale Tectonics on an Obliquely Convergent Margin: The Bahia Basin, Offshore Colombian Caribbean

Basin Evolution and Shale Tectonics on an Obliquely Convergent Margin: The Bahia Basin, Offshore Colombian Caribbean

Identification of submarine landslides in the Colombian Caribbean Margin (Southern Sinú Fold Belt) using seismic investigations

Regional controls in the distribution and morphometry of deep-water gravitational deposits along a convergent tectonic margin. Southern Caribbean of Colombia

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