Middle Miocene near trench volcanism in northern Colombia: A record of slab tearing due to the simultaneous subduction of the Caribbean Plate under South and Central America?

Lara, Mario; Cardona, A.; Monsalve, Gaspar; Yarce, J.; Montes, Camilo; Valencia, Víctor A.; Weber, Marion; Parra, Felipe de la; Espitia, Diana; López‐Martínez, Margarita

doi:10.1016/j.jsames.2012.12.006

Cited by 19 publications

(13 citation statements)

References 63 publications

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“…Group 3 (Figure ) should be a representation of the Ecuador‐Colombia Trench that results from Nazca subduction (Figure b). For the case of the Caribbean‐NAB transition (Group 5 in Figure ) we interpret the lithospheric thickness as the superposition of a relatively thin continental crust and a flatly subducting Caribbean plate (Figure c), as suggested by several studies [ Cerón et al ., ; Lara et al ., ; Poveda et al ., ; Sanchez‐Rojas and Palma , ; Bernal‐Olaya et al ., ; Syracuse et al ., ]. At the EC (Groups 13–15 in Figure ), which is continental in nature and should not be on top of a flat slab [ Chiarabba et al ., ; Syracuse et al ., ], the lithospheric thickness is similar to those in the Caribbean‐NAB transition, where a flat slab should be present; this is illustrated in the cartoon of Figure c.…”

Section: Resultsmentioning

confidence: 99%

Lithospheric thickness estimation beneathNorthwesternSouthAmerica from anS‐wave receiver function analysis

Blanco

Vargas

Monsalve

2017

Geochem Geophys Geosyst

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We make use of the S‐to‐P receiver function technique beneath Colombia and neighboring regions to make a first‐order approximation of the depth of the Lithosphere‐Asthenosphere Boundary (LAB) and, therefore, of lithospheric thickness. A deconvolution technique was used to calculate the receiver functions, and after a moveout correction and a time‐depth conversion, LAB depths for different tectonic regions of northwestern South America were obtained. Results are typically between 65 and 110 km, consistent with previous estimates around the world and other regions in South America. Lithospheric thickness beneath an oceanic island in the Caribbean is ∼80 km, whereas for the Ecuador‐Colombia Trench it is ∼65 km, and around 100 km for the Panama Arc. The transition to the continent is associated with an increase in LAB depth, where it can reach ∼110 km, with no significant differences among terranes and/or tectonic blocks.

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Section: Resultsmentioning

confidence: 99%

Lithospheric thickness estimation beneathNorthwesternSouthAmerica from anS‐wave receiver function analysis

Blanco

Vargas

Monsalve

2017

Geochem Geophys Geosyst

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“…(a) Th/Yb versus Ta/Yb (Pearce, ) and (b) Ba/Th versus La/Sm (Labanieh et al, ) plots showing the mantle source nature of the Mongolian mafic rocks. Some basalts of typical origins in the world are also shown for comparison and the data sources are as follows: NE China: Fan et al, ; Ji et al, ; Yu et al, ; Meng et al, ; Guo et al, ; Sun et al, ; Xu et al, ; Dong et al, ; Li, Liu, et al, ; Li, Hegner, et al, ; Yang et al, ; Columbian Trap: Nivia, Marriner, Kerr, & Tarney, ; Lara et al, ; Ontong Java: Fitton & Godard, ; White, Castillo, Neal, Fitton, & Godard, ; Siberian Trap: Reichowa, Saunders, White, Al'Mukhamedov, & Medvedev, ; Chuvashova, Rasskazov, & Yasnygina, ; Svetlitskaya & Nevolko, ; Emeishan Trap: Xiao, Xu, Chung, & Mei, ; Zi, Fan, Wang, & Peng, ; Deccan Trap: Sheth, Mahoney, & Chandrasekharam, ; Duraiswami & Shaikh, ; East Africa: MacDonald, Rogers, Fitton, Black, & Smith, )…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

et al. 2018

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This paper presents new geochemical and geochronological data of the Late Mesozoic volcanic rocks in East Mongolia. These volcanic rocks belong to high‐K calc‐alkaline and shoshonitic series and exhibit features of bimodal rocks. The mafic rocks have elevated incompatible trace element concentrations and significantly negative Nb, Ta, and Ti anomalies, with 87Sr/86Sr(i) and ƐNd(t) values of 0.70502–0.70572 and −1.72459 to +1.720736, respectively, which suggest that the mafic magma was derived from a lithospheric mantle source that might have been metasomatized by subduction‐derived fluids, experienced fractional crystallization, and was contaminated by crustal materials. The felsic rocks have similar rare earth element patterns to the mafic rocks but show much more significantly negative Eu and Sr anomalies. The felsic rocks have higher 87Sr/86Sr(i) values of 0.706496–0.71104 than the mafic rocks but similar ƐNd(t) values (−0.28003 to +2.928506) to the mafic ones. These data indicate that the felsic rocks originated from partial melting of a crustal source that is dominated by juvenile mafic rocks. Our new K‐Ar dating, together with previous data, shows that the Late Mesozoic volcanism in East Mongolia took place during the Late Jurassic‐Early Cretaceous between ca. 155 and 99 Ma. The model of back‐arc extension, possibly induced by slab rollback of the westward subducted Pacific Plate and the subduction zone retreat, can explain the geodynamic setting and the eastward younging trend of the Late Mesozoic volcanism in East Mongolia and in adjacent NE China.

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“…This area currently represents a region of highly oblique convergence of the Caribbean Plate and the North Andean Block. There are geological and geophysical pieces of evidence that support a flat subduction process beneath this area [ Vargas and Mann , ], without the formation of an asthenospheric wedge [ Lara et al ., ], but it is clear from GPS vectors [ Trenkamp et al ., ] that such convergence is not being absorbed by deformation in this region.…”

Section: Discussionmentioning

confidence: 99%

Receiver functions and crustal structure of the northwestern Andean region, Colombia

2015

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We used the receiver function technique to deduce crustal thickness beneath the northwestern Andean system, using data from the permanent seismic network of Colombia, combined with some of the IRIS and CTBTO stations in Colombia and Ecuador. The estimation of crustal thickness was made using the primary P to s conversion and crustal reverberations. The bulk crustal V P /V S ratio was constrained using a crustal thickness versus V P /V S stacking method, in addition to estimations using a time to depth conversion technique based on results of a modified Wadati diagram analysis. We observed a wide range of crustal thicknesses, including values around 17 km beneath the Malpelo Island on the Pacific Ocean, 20 to 30 km at the coastal Pacific and Caribbean plains of Colombia, 25 to 40 km beneath the eastern plains and foothills, 35 km beneath the Western Cordillera, 45 km at the Magdalena River intermountain valley, 52 to 58 km under the northern Central Cordillera, and reaching almost 60 km beneath some of the volcanoes of the Southern Cordilleran system of Colombia; crustal thickness can be slightly greater than 60 km beneath the plateau of the Eastern Cordillera. The values of V P /V S are particularly high for some of the stations on the volcanic centers, reaching values above 1.79, probably related to the addition of mafic materials to the lower crust, and in the plateau of the Eastern Cordillera near Bogota, where we speculate about the possibility of crustal seismic anisotropy associated with shear zones.

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Middle Miocene near trench volcanism in northern Colombia: A record of slab tearing due to the simultaneous subduction of the Caribbean Plate under South and Central America?

Cited by 19 publications

References 63 publications

Lithospheric thickness estimation beneathNorthwesternSouthAmerica from anS‐wave receiver function analysis

Lithospheric thickness estimation beneathNorthwesternSouthAmerica from anS‐wave receiver function analysis

Petrogenesis and tectonic implication of the Late Mesozoic volcanic rocks in East Mongolia

Receiver functions and crustal structure of the northwestern Andean region, Colombia

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