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

Mass balance of Neogene sediments in the Colombia basin relationship with the evolution of the Magdalena and Cauca River basins

“…The axis of this strip is parallel to the direction of regional magnetic anomalies observed in the CB area [47],[86], [87], a zone characterized by eastwest strike normal fault systems, which mainly affected the basin's basement and preserve remnants of Mesozoic sediments (Figure 5). Another area with thicknesses greater than 2,000 m, although [131], in black the global eustatic change curve [93] and the age of the MTCs previously identified [59], [115], [126] . On the right, relative frequency graph of the ages obtained by fission analysis in apatite's (thick black dotted line) and phases of magmatism from other dating methods (blue to red degraded polygons called phases 1 to 4) in the NWCSA, based on the age compilation [33] and the temporal position of the detritic zircons recovered during this study (yellow rhombuses) in the Sinu and San Jacinto mountain ranges (see sample locations in Figs.…”

“…MSF and SCDB, suggest that areas with low sediment supply, high slope angle, and strong structural relief are capable of triggering mass movements of sediment [59]. It has also been possible to morphologically define the upper, middle and lower part of the MSF, where submarine canyon systems, channel-lobe systems, and turbidity currents are developed respectively [60].…”

“…It is common to presume that, in the periods of major relative sea level fall, significant events of MTC become evident, especially in their initial state [95], [120], as a result of the instability of platform and slope areas [121]. However, it has been observed that MTC's can occur at any time during the evolution of the margin [122], and in the SCDB area, the origin of MTC's has been linked mainly to the structural evolution of the anticlines during the Plio-Pleistocene [40], [59], [76]. Considering the high sedimentation rates estimated during the accumulation of sequence S06, added to the major global sea level fall at this time, as well as the important volcanic activity recorded in the Central Cordillera, it may be considered that, the formation of the Cartagena MTC was governed not only by the structural evolution of the margin.…”

“…In the Cartagena area, limestones from the La Popa Formation accumulated in very shallow marine environments during the Pleistocene [123], indicating that much of the current coastal zone was submerged under the sea, facilitating the exit of the Magdalena River through the Canal del Dique area, migrating from the late Pleistocene [124], northward up to their current position (Figure 28). The change of course and the active deformation of the SCDB, during the accumulation of the S08 sequence, led to the formation of numerous MTCs [125], some of which have affected the underwater cable infrastructure in the last century [58], [59].…”

“…Note the low sedimentary rates in the interval from 11.6 to 5.01 Ma in the study area, similar to the current ones and the extremely high ones developed between 2.36 and 2.21 Ma. In red the trend of global surface temperature[131], in black the global eustatic change curve[93] and the age of the MTCs previously identified[59],[115],[126] . On the right, relative frequency graph of the ages obtained by fission analysis in apatite's (thick black dotted line) and phases of magmatism from other dating methods (blue to red degraded polygons called phases 1 to 4) in the NWCSA, based on the age compilation[33] and the temporal position of the detritic zircons recovered during this study (yellow rhombuses) in the Sinu and San Jacinto mountain ranges (see sample locations in Figs.9 and 10).…”