Terranes and Continental Accretion in the Colombian Andes

Restrepo, Jorge Julián; Toussaint, Jean François

doi:10.18814/epiiugs/1988/v11i3/006

Cited by 137 publications

(77 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The western Cordillera is characterized by series of allochthonous Cretaceous oceanic terranes that have accreted to the continental margin since the Late Cretaceous (Restrepo and Toussaint, 1988;Kerr et al, 1997;Villagómez et al, 2011;Villagómez and Spikings, 2013). The Eastern Cordillera also includes a more limited Late Triassic to Early Jurassic siliciclastic series covered by an extensive Early Cretaceous transgressive sequence, with welldefined extensional structures (Sarmiento-Rojas et al, 2006) and limited small gabbroic plutons of Early to Late Cretaceous in age (Vásquez and Altenberger, 2005;Vásquez et al, 2010).…”

Section: Geological Settingmentioning

confidence: 99%

Late Jurassic to Early Cretaceous plutonism in the Colombian Andes: A record of long-term arc maturity

Bustamante

Archanjo

Cardona

et al. 2016

Geological Society of America Bulletin

View full text Add to dashboard Cite

Integrated geochemical, isotopic, and geochronological constraints from Jurassic plutonic rocks of the Central Cordillera in Colombia were used to determine the tectonic setting and long-term tectonomagmatic evolution of the Northern Andes. We examined three plutonic units with compositions that vary from diorite to granite and with U-Pb zircon crystallization ages from 165 Ma to 129 Ma. These units are interpreted as subduction-related magmas, as indicated by their K 2 O, Na 2 O contents, light to heavy rare earth element (LREE/HREE) ratios, and Pb isotope signatures. The Nd and Hf isotope compositions of these magmatic events become more juvenile (radiogenic) with time. This compositional record suggests an arc maturity trend in which partial melting of basaltic and peridotitic sources becomes more significant than radio genic subducted sediments or the ancient continental crust. Global-scale tectonic reconstructions suggest that Late Jurassic to Early Cretaceous subduction of the Farallon oceanic plate under the Andean continental margin became highly oblique. The consequence was a reduction of the fusible sedimentary budget commonly incorporated during subduction into the mantle, leaving a more refractory mantle with a more primitive compositional signature, and a major decrease in magmatic activity in the Early Cretaceous. In addition, the magmatic evolution recorded in the North Andean Jurassic arc shows that long-term source evolution and regionalscale plate-tectonic processes also play an important role in the compositional evolution and volumes of magmatic products in convergent settings.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Late Jurassic to Early Cretaceous plutonism in the Colombian Andes: A record of long-term arc maturity

Bustamante

Archanjo

Cardona

et al. 2016

Geological Society of America Bulletin

View full text Add to dashboard Cite

show abstract

“…3) do not provide a complete inventory of potential sediment sources. For example, terrane accretion events characterized the late Mesozoic-earliest Cenozoic history of the westernmost Colombian Andes (e.g., Aspden and McCourt, 1986;Restrepo and Toussaint, 1988;Kerr and Tarney, 2005), with possibly signifi cant along-margin translation of terranes (e.g., Bayona et al, 2006). Some have also proposed an allochthonous origin for Precambrian-Paleozoic basement of the Central Cordillera and parts of the Eastern Cordillera (e.g., Forero Suarez, 1990;Cediel et al, 2003;Cardona et al, 2010).…”

Section: Potential Sediment Sourcesmentioning

confidence: 99%

“…For the eastern part of the Central Cordillera, Vinasco et al (2006) demonstrate zircon U-Pb inheritance of Mesoproterozoic and Neoproterozoic zircons (500, 700, 900, and 1100 Ma), suggesting a Mesoproterozoic to lower Paleozoic basement comparable in age to basement of the Eastern Cordillera (e.g., Cordani et al, 2005). In contrast, the western half of the Central Cordillera is widely considered part of an oceanic accreted terrane (Aspden and McCourt , 1986;Restrepo and Toussaint, 1988;Cediel et al, 2003). Although the similarity of the eastern fl ank of the Central Cordillera to the Eastern Cordillera does not rule out interpretations of a separate continental terrane (Forero Suarez, 1990;Restrepo-Pace, 1992;Richards, 1995), it may be more compatible with minor separation and reattachment of a Central Cordillera block along the western Andean margin, as argued for the Arequipa terrane of the central Andes (e.g., Loewy et al, 2004;Ramos, 2008).…”

Section: Basement Confi Gurationmentioning

confidence: 99%

Linking sedimentation in the northern Andes to basement configuration, Mesozoic extension, and Cenozoic shortening: Evidence from detrital zircon U-Pb ages, Eastern Cordillera, Colombia

Horton¹,

Saylor²,

Nie³

et al. 2010

Geological Society of America Bulletin

186

161

View full text Add to dashboard Cite

Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) analyses of 29 samples from the EasternCordillera of Colombia reveal the origin of northern Andean basement and patterns of sedimentation during Paleozoic subsidence, Jurassic-Early Cretaceous extension, Late Cretaceous postrift subsidence, and Cenozoic shortening and foreland-basin evolution. U-Pb geochronological results indicate that presumed Precambrian basement is mainly a product of early Paleozoic magmatism (520-420 Ma) potentially linked to subduction and possible collision. Inherited zircons provide evidence for Mesoproterozoic tectonomagmatic events at 1200-1000 Ma during Grenville-age orogenesis. Detrital zircon U-Pb ages for Paleozoic strata show derivation from Andean basement, syn depositional magmatic sources (420-380 Ma), and distal sources of chiefl y Mesoproterozoic basement (1650-900 Ma) in the Amazonian craton (Guyana shield) to the east or in possible continental terranes along the western margin of South America. Sedimentation during Jurassic-Early Cretaceous rifting is expressed in detrital zircon age spectra as Andean basement sources, recycled Paleozoic contributions, and igneous sources of Carboniferous-Permian (310-250 Ma) and Late Triassic-Early Jurassic (220-180 Ma) origin. Detrital zircon provenance during continued Cretaceous extension and postrift thermal subsidence recorded the elimination of Andean basement sources and increased infl uence of craton-derived drainage systems providing mainly Paleoproterozoic and Mesoproterozoic (2050-950 Ma) grains. By Eocene time, zircons from the Guyana shield (1850-1350 Ma) dominated the detrital signal in the easternmost Eastern Cordillera. In contrast, coeval Eocene deposits in the axial Eastern Cordillera contain Late Cretaceous-Paleocene (90-55 Ma), Jurassic (190-150 Ma), and limited Permian-Triassic (280-220 Ma) zircons recording initial uplift and exhumation of principally Mesozoic magmatic-arc rocks to the west in the Central Cordillera. Oligocene-Miocene sandstones of the proximal Llanos foreland basin document uplift-induced exhumation of the Eastern Cordillera fold-thrust belt and recycling of the Paleogene cover succession rich in both arc-derived detritus (dominantly 180-40 Ma) and shield-derived sediments (mostly 1850-950 Ma). Late Miocene-Pliocene erosion into the underlying Cretaceous section is evidenced by elimination of Mesozoic-Cenozoic zircons and increased proportions of 1650-900 Ma zircons emblematic of Cretaceous strata.

show abstract

“…The northern Andes are located in an area of high tectonic complexity, where at least three major tectonic plates converge. Several episodes of accretion have occurred since at least Cretaceous time [ Restrepo and Toussaint , ; Cediel et al ., ], and there are substantial differences in the geologic and tectonic nature of the different terranes thus formed. It is also known that there are at least two distinct subduction segments [ Pennington , ; van der Hilst and Mann , ; Taboada et al ., ; Cortés and Angelier , ], with significant variations in terms of angle of subduction [ Gutscher et al ., ].…”

Section: Introductionmentioning

confidence: 99%

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

2015

View full text Add to dashboard Cite

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.

show abstract

Terranes and Continental Accretion in the Colombian Andes

Cited by 137 publications

References 0 publications

Late Jurassic to Early Cretaceous plutonism in the Colombian Andes: A record of long-term arc maturity

Late Jurassic to Early Cretaceous plutonism in the Colombian Andes: A record of long-term arc maturity

Linking sedimentation in the northern Andes to basement configuration, Mesozoic extension, and Cenozoic shortening: Evidence from detrital zircon U-Pb ages, Eastern Cordillera, Colombia

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

Contact Info

Product

Resources

About