Detrital zircon fission-track thermochronology and magnetic fabric of the Amagá Formation (Colombia): Intracontinental deformation and exhumation events in the northwestern Andes

Piedrahita, Victor A.; Bernet, Matthias; Chadima, Martin; Sierra, Gloria; Marín-Cerón, María Isabel; Toro, Gloria

doi:10.1016/j.sedgeo.2017.05.003

Cited by 18 publications

(10 citation statements)

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“…However, it is virtually impossible to know the elevation and continuity of these emergent areas and whether precursors to the modern Cauca and San Jorge Rivers were already in place at the time. Regarding this point, Mora et al (2018) propose a connection of the Lower Magdalena Valley to the Cauca valley as supported by middle Miocene provenance signatures and delta-plan facies for the Upper Member of the Amagá Formation (Montes et al, 2015;Piedrahita et al, 2017). The interpretation of ancestral rivers reaching the proto-Caribbean is speculative, but Mora et al (2018) also suggest the presence of a Lower Amagá-Ciénaga de Oro delta by the late Oligocene -early Miocene based on provenance data (Montes et al, 2015), detrital zircon fission track thermochronology, and borehole facies analyses.…”

Section: Cauca and San Jorge Riversmentioning

confidence: 95%

“…Mora et al (2018) suggest that the first clear appearance of fluvial sedimentites in the Lower Magdalena Valley, Urabá, and southern Sinú Basins was delayed until the Pliocene deposition of the Corpa Formation. The presence of uplifted regions to the south near the modern Cauca and San Jorge River valleys (Villagómez & Spikings, 2013;Piedrahita et al, 2017) may suggest an advancing pair of prograding river deltas by late Oligocene to middle Miocene time in the Lower Magdalena Valley with the appearance of proximal fluvial sedimentites by the Pliocene. This hypothesis provides an alternative explanation according to which Late Paleogene to Neogene rivers originated in the south rather than from an emergent Isthmus of Panamá.…”

Section: Cauca and San Jorge Riversmentioning

confidence: 99%

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Chapter 4

SGC¹

2019

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In this chapter, we summarize recent work on the geologic evolution of the northern Andes. Our intention is to present current information so that scientists from other disciplines can differentiate data from interpretations. In this effort, we focus on thermochronological data that provide precise places, dates, and rates. Thermochronological data provide cooling histories for rocks of the upper crust, whereas provenance data offer insights on rocks that have been eroded away. In reviewing published data, we provide a critical overview of recent paleogeographic interpretations. Specifically, we discuss hypotheses such as (i) Eocene proto-Magdalena River draining toward the Maracaibo Basin, (ii) the presence of a closed proto-Magdalena basin from the late Eocene to middle Miocene, (iii) the Miocene closure of the Isthmus of Panamá, (iv) the late Cenozoic surface uplift of the Eastern Cordillera, and (v) the Cenozoic eastward advance of the Orinoco River. We conclude that in most cases, favored ideas remain as intriguing hypotheses, but there remains room for alternative interpretations. The present summary is intended to provide a cautionary note on the use of limited datasets to make paleogeographic interpretations of the northern Andes.

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Section: Cauca and San Jorge Riversmentioning

confidence: 95%

Section: Cauca and San Jorge Riversmentioning

confidence: 99%

Chapter 4

SGC¹

2019

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“…In addition, dealing with volcanic and particularly volcaniclastic deposits the risk of contamination with apatites and zircons recycled from the country rock is high, and has been shown to be the case for certain volcanic deposits of the Paipa-Iza volcanic complex (Bernet et al, 2016). Here we also think that zircons with >12 Ma apparent cooling ages were most likely recycled from the Amagá Formation (Piedrahita et al, 2017). Pre-Miocene cooling ages are common in apatites of the Combia Formation deposits (Table 1), and are considered to be derived from underlying basement rock and recycling of the Amagá Formation.…”

Section: Constraints From Low-temperature Thermochronologymentioning

confidence: 59%

Thermochronological, petrographic and geochemical characteristics of the Combia Formation, Amagá basin, Colombia

Bernet

García

Chauvel

et al. 2020

Journal of South American Earth Sciences

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The Amagá basin between the Western and Central Cordilleras of the Northern Andes of Colombia host the Neogene volcanic and volcaniclastic Combia Formation. At this stage it is not clear how the formation of this unit is related to arc volcanism and which role the Nazca plate subduction beneath the western margin of South America plays. The timing, petrography and geochemical characteristics of Combia Formation rocks were studied in the western and eastern parts of the Amagá basin, in order to gain more information on the type of magma generation and volcanic activity that led to the deposition of the Combia Formation. Apatite and zircon fission-track dating largely confirm a 12-6 Ma age for the deposition of the Combia Formation. Petrographic and major element analyses show that mainly trachy-andesite ignimbrites with a calc-alkaline composition were deposited in the western Amagá basin, whereas the volcanic rocks of the eastern Amagá basin are lava flow and fallout deposits of basaltic andesites or of tholeiitic composition. Trace element and isotopic analyses show that slab dehydration and sediment melting were important in primary magma generation in the mantle wedge, but the primary magma was mixed with lower continental crustal melts, resulting in characteristic isotope signatures in the western and eastern Amagá basin. All this points to subduction driven arc volcanism with slab dehydration, sediment melting magma mixing.

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“…The Grajales et al (2020) model implies that the southern sector of the Panama-Choco Block was already accreted to the continental margin during Early Paleogene and that the oblique subduction of the Farallon plate would have generated simultaneous magmatism in the CC and WC (Figure 3c and d). However, this interpretation contradicts thermochronological, structural, and paleomagnetic data from Colombia and Panama suggesting that the Panama-Choco Block was accreted during the Neogene to north western Colombia (MacDonald, 1980;Suter et al, 2008;Farris et al, 2011;Barat et al, 2014;Piedrahita et al, 2017;. This model neither can explain the Paleogene magmatism in the Santa Marta and Guajira massifs (Cardona et al, 2011(Cardona et al, , 2014Salazar et al, 2016), high-pressure metamorphic rocks associated to suture zones reported in western Colombia (Bustamante and Bustamante, 2019;Avellaneda-Jiménez et al, 2020;Bustamante et al, 2020) and faults that bound the Panama-Choco block and southern sector of the WC (Figure 3c).…”

Section: Comparison Between Previously Proposed Paleogeographic and Tectonic Models For The Northern Andes And Panama And That Proposed Bmentioning

confidence: 90%

Comment on “Emplazamiento del magmatismo Paleoceno-Eoceno bajo un régimen transtensional y su evolución a un equilibrio dinámico en el borde occidental de Colombia” by Grajales et al., Rev. Mex. Cienc. Geol. (2020), 37(3), 250-268

Barbosa-Espitia¹,

Kamenov²,

Foster³

et al. 2021

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Grajales et al. (2020) reviewed geochronological and geochemical data from Paleogene volcanic and plutonic rocks outcropping in the Panama-Choco Block (north western Cordillera) and southern Western Cordillera, as well as the Central Cordillera of Colombia. These data were used to support a model of continuous Paleogene arc magmatism along the Colombian continental margin, and to propose a paleogeographic model for the arc. The authors did not discuss previously published paleomagnetic, geochemical, geochronological, thermochronological and provenance constraints from Cretaceous to Miocene rocks of western and northern Colombia, Panama, and Ecuador that support a more plausible model of a double subduction system controlled by the convergence of the Caribbean and Farallon plates beneath the north Andean block during Paleogene. In this comment, we discuss shortcomings in the data and model proposed by Grajales et al. (2020) and present an alternative interpretation for contemporaneous arc-like magmatism during the Paleogene in the Northern Andes. We conclude that the double subduction system is the more plausible explanation for the contemporaneous arc-like magmatism during the Paleogene, currently exposed in the northern and southern portions of the Northern Andes.

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Detrital zircon fission-track thermochronology and magnetic fabric of the Amagá Formation (Colombia): Intracontinental deformation and exhumation events in the northwestern Andes

Cited by 18 publications

References 94 publications

Chapter 4

Chapter 4

Thermochronological, petrographic and geochemical characteristics of the Combia Formation, Amagá basin, Colombia

Comment on “Emplazamiento del magmatismo Paleoceno-Eoceno bajo un régimen transtensional y su evolución a un equilibrio dinámico en el borde occidental de Colombia” by Grajales et al., Rev. Mex. Cienc. Geol. (2020), 37(3), 250-268

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