Cenozoic Tectonostratigraphic Evolution of the Lower Magdalena Basin, Colombia: An Example of an Under- to Overfilled Forearc Basin

Bernal-Olaya, Rocio; Mann, Paul; Escalona, Alejandro

doi:10.1306/13531943m1083645

Cited by 12 publications

(28 citation statements)

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“…There is considerable debate on the geometries of the downgoing Nazca and Caribbean Plates [e.g., van der Hilst and Mann, 1994;Taboada et al, 2000;Corredor, 2003;Cortés and Angelier, 2005;Zarifi et al, 2007;Vargas and Mann, 2013;Bernal-Olaya et al, 2015a, 2015b, 2015cSyracuse et al, 2016;Chiarabba et al, 2016]. There is considerable debate on the geometries of the downgoing Nazca and Caribbean Plates [e.g., van der Hilst and Mann, 1994;Taboada et al, 2000;Corredor, 2003;Cortés and Angelier, 2005;Zarifi et al, 2007;Vargas and Mann, 2013;Bernal-Olaya et al, 2015a, 2015b, 2015cSyracuse et al, 2016;Chiarabba et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

“…Our understanding of the evolution of Colombian plate boundaries is limited by uncertainty about the modern geometry of the subducted slabs, and vice versa. There is considerable debate on the geometries of the downgoing Nazca and Caribbean Plates [e.g., van der Hilst and Mann, 1994;Taboada et al, 2000;Corredor, 2003;Cortés and Angelier, 2005;Zarifi et al, 2007;Vargas and Mann, 2013;Bernal-Olaya et al, 2015a, 2015b, 2015cSyracuse et al, 2016;Chiarabba et al, 2016]. The best evidence for the presence of slab material at depth comes from the locations of two distinct, abruptly offset dipping planes of seismicity (Wadati Benioff Zones, WBZs).…”

Section: Introductionmentioning

confidence: 99%

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Transient slab flattening beneath Colombia

Wagner

Jaramillo

Ramirez-Hoyos

et al. 2017

Geophysical Research Letters

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Subduction of the Nazca and Caribbean Plates beneath northwestern Colombia is seen in two distinct Wadati Benioff Zones, one associated with a flat slab to the north and one associated with normal subduction south of 5.5°N. The normal subduction region is characterized by an active arc, whereas the flat slab region has no known Holocene volcanism. We analyze volcanic patterns over the past 14 Ma to show that in the mid‐Miocene a continuous arc extended up to 7°N, indicating normal subduction of the Nazca Plate all along Colombia's Pacific margin. However, by ~6 Ma, we find a complete cessation of this arc north of 3°N, indicating the presence of a far more laterally extensive flat slab than at present. Volcanism did not resume between 3°N and 6°N until after 4 Ma, consistent with lateral tearing and resteepening of the southern portion of the Colombian flat slab at that time.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Transient slab flattening beneath Colombia

Wagner

Jaramillo

Ramirez-Hoyos

et al. 2017

Geophysical Research Letters

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“…Regionally, the middle Miocene is characterized by the emplacement of the Choco block and initial collision of the Panama Arc in western Colombia (Duque‐Caro, , ; Montes et al, ; Montes, et al, b). This collision and the continuous south‐eastward shallow subduction of the Caribbean Plate led to the inversion and uplift of the northern Andes, including the Eastern Cordillera, and the formation of the proto‐Magdalena river, events that provided large amounts of sediments to the Caribbean basins (e.g., Bernal‐Olaya et al, a; Escalona & Mann, ; Gomez et al, a). In the Bahia Basin, deformation is partitioned along the Bahia Fault and Fault C, with a subordinate Fault A.…”

Section: Discussionmentioning

confidence: 99%

“…The basement composition beneath the wedge remains ambiguous; some models suggest that it is oceanic crust (Flinch, ; Mora‐Bohórquez et al, ), although studies using gravity modeling suggest an attenuated continental crust (Ceron‐Abril, ) or a wedge of continental crust accreted during the initial stages of subduction (Mantilla‐Pimiento, ). The Romeral Fault Zone forms the eastern boundary of the SJFB, which has been traditionally considered the main boundary between the South American continental crust and the accreted late Cretaceous to Paleocene oceanic crust of the Caribbean Plate ( e.g., Bernal‐Olaya et al, a; Kennan & Pindell, ; Kerr et al, ; Kerr, ; Figure ).…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…The Plato‐San Jorge Basin lies to the south of the study area between the Romeral Fault to the west and the Santa Marta‐Bucaramanga Fault to the east (Figure ). This basin is filled by a thick (2–8 km) sequence of paralic and marine sediments of late Eocene to Holocene age and is compartmentalized by deep‐rooted normal faults that affect the basement and sediments as young as late Miocene in age (Bernal‐Olaya et al, a; Cediel et al, ; Duque‐Caro, ; Montes et al, ; Mora‐Bohórquez et al, ). Inversion structures due to the reactivation of these faults during the Andean Orogeny have been observed close to the boundaries of the basin, specially associated with the Romeral Fault Zone, exposing strata as old as Miocene in age (Bernal‐Olaya, et al, a; Montes et al, ).…”

Section: Regional Geological Settingmentioning

confidence: 99%

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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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Upper and Middle Crustal Velocity Structure of the Colombian Andes From Ambient Noise Tomography: Investigating Subduction‐Related Magmatism in the Overriding Plate

et al. 2018

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New maps of S velocity variation for the upper and middle crust making up the northwestern most corner of South America have been developed from cross correlation of ambient seismic noise at 52 broadband stations in the region. Over 1,300 empirical Green's functions, reconstructing the Rayleigh wave portion of the seismic wavefield, were obtained after time and frequency‐domain normalization of the ambient noise recordings and stacking of 48 months of normalized data. Interstation phase and group velocity curves were then measured in the 6–38 s period range and tomographically inverted to produce maps of phase and group velocity variation in a 0.5° × 0.5° grid. Velocity‐depth profiles were developed for each node after simultaneously inverting phase and group velocity curves and combined to produce 3‐D maps of S velocity variation for the region. The S velocity models reveal a ~7 km thick sedimentary cover in the Caribbean region, the Magdalena Valley, and the Cordillera Oriental, as well as crustal thicknesses in the Pacific and Caribbean region under ~35 km, consistent with previous studies. They also display zones of slow velocity at 25–35 km depth under regions of both active and inactive volcanism, suggesting the presence of melts that carry the signature of segmented subduction into the overriding plate. A low‐velocity zone in the same depth range is imaged under the Lower Magdalena Basin in the Caribbean region, which may represent either sublithospheric melts ponding at midcrustal levels after breaching through a fractured Caribbean flat slab or fluid migration through major faults within the Caribbean crust.

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Cenozoic Tectonostratigraphic Evolution of the Lower Magdalena Basin, Colombia: An Example of an Under- to Overfilled Forearc Basin

Cited by 12 publications

References 0 publications

Transient slab flattening beneath Colombia

Transient slab flattening beneath Colombia

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

Upper and Middle Crustal Velocity Structure of the Colombian Andes From Ambient Noise Tomography: Investigating Subduction‐Related Magmatism in the Overriding Plate

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