Along-strike Crustal Thickness Variations of the Subducting Caribbean Plate Produces Two Distinctive Styles of Thrusting in the Offshore South Caribbean Deformed Belt, Colombia

Bernal-Olaya, Rocio; Sanchez, J.; Mann, Paul; Murphy, M. Dianne

doi:10.1306/13531941m1083645

Cited by 11 publications

(18 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results of this study suggest a northward shift in the source area of the MTCs through time, coinciding with the propagation direction of the structures (e.g. Bernal‐Olaya et al ., ; Martinez et al ., ). This local finding suggests that systematic shifts in MTC source areas through time could be investigated in other areas along the margin to help constrain the evolution of the entire Sinú fold belt.…”

Section: Discussionmentioning

confidence: 97%

“…Plate convergence has resulted in the formation of imbricate thrust folds, which have been active onshore since the Late Palaeocene (Flinch, ) and offshore since the Middle‐Late Miocene (Cediel et al ., ; Martinez et al ., ). The offshore Sinú fold belt is dominated by a series of thrust‐cored anticlines that young to the north (Bernal‐Olaya et al ., ; Martinez et al ., ) and have experienced episodic growth during the Plio‐Pleistocene (Duque‐Caro, , ; Kolla & Buffler, ; Cediel et al ., ; Flinch, ). The Sinú fold belt is divided into two regions of active deformation (southern and northern Sinú fold belts; Fig.…”

Section: Regional Settingmentioning

confidence: 97%

See 1 more Smart Citation

Mass‐transport complexes as markers of deep‐water fold‐and‐thrust belt evolution: insights from the southern Magdalena fan, offshore Colombia

et al. 2016

View full text Add to dashboard Cite

Mass wasting is an important process in the degradation of deep‐water fold‐and‐thrust belts. However, the relationship between mass‐transport complex (MTC) emplacement and the timing and spatial progression of contractional deformation of the seabed have not been extensively studied. This study uses high‐quality, 3D seismic reflection data from the southern Magdalena Fan, offshore Colombia to investigate how the growth of a deep‐water fold‐and‐thrust belt (the southern Sinú fold belt) is recorded in the source, distribution and size of MTCs. More than nine distinct, but coalesced MTCs overlie a major composite basal erosion surface. This surface formed by multiple syn‐ and post‐tectonic mass‐wasting events and is thus highly diachronous, thereby recording a protracted period of tectonism, seascape degradation and associated sedimentation. The size and source location of these MTCs changed through time: the oldest ‘detached’ MTCs are relatively small (over 9–100 km2 in area) and sourced from the flanks of growing anticlines, whereas the younger ‘shelf‐attached’ MTCs are considerably larger (more than 200–300 km2), are sourced from the shelf, and post‐date the main phase of active folding and thrusting. Changes in the source, distribution and size of MTCs are tied to the sequential nucleation, amplification and along‐strike propagation of individual structures, showing that MTCs can be used to constrain the timing and style of contractional deformation, and seascape evolution in time and space.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Regional Settingmentioning

confidence: 97%

Mass‐transport complexes as markers of deep‐water fold‐and‐thrust belt evolution: insights from the southern Magdalena fan, offshore Colombia

et al. 2016

View full text Add to dashboard Cite

show abstract

“…In spite of the many interpretations from tomographic imaging, all models seem to agree that the Nazca plate is subducting with an average angle of 35° in a nearly eastward direction, although with high variability along the subduction front and, therefore, presenting segmentation (Gutscher et al, ). The Caribbean plate, on the other hand, would be subducting at shallower dip angle <10° in a WNW‐ESE direction (Bernal‐Olaya, Sanchez et al, ; Mora‐Bohórquez et al, ), with no apparent signs of segmentation. All models also agree that the shift in intermediate‐depth seismicity and surface volcanism would be the result of deep versus shallow subduction along the Colombian trench.…”

Section: Geology and Crustal Structurementioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

“…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%

Transient slab flattening beneath Colombia

Wagner

Jaramillo

Ramirez-Hoyos

et al. 2017

Geophysical Research Letters

View full text Add to dashboard Cite

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.

show abstract

Along-strike Crustal Thickness Variations of the Subducting Caribbean Plate Produces Two Distinctive Styles of Thrusting in the Offshore South Caribbean Deformed Belt, Colombia

Cited by 11 publications

References 0 publications

Mass‐transport complexes as markers of deep‐water fold‐and‐thrust belt evolution: insights from the southern Magdalena fan, offshore Colombia

Mass‐transport complexes as markers of deep‐water fold‐and‐thrust belt evolution: insights from the southern Magdalena fan, offshore Colombia

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

Transient slab flattening beneath Colombia

Contact Info

Product

Resources

About