Provenance of the Cenozoic siliciclastic intramontane Amagá Formation: Implications for the early Miocene collision between Central and South America

Lara, Mario; Salazar-Franco, Ana M.; Silva-Tamayo, Juan Carlos

doi:10.1016/j.sedgeo.2018.06.003

Cited by 22 publications

(30 citation statements)

References 41 publications

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“…El Morito Basaltic andesites Miocene (Lara et al, 2018). Jaramillo (1976) also reported two dikes that cut the CF at the Alto Combia location and described them as an alkaline-rock unit similar to absarokites.…”

Section: El Botón Magmatic Arcmentioning

confidence: 99%

“…Shoshonitic magmas form in various tectonic settings, including within plates, continental rifts, ocean islands, oceanic arcs, back-arc extensional zones, and continental arcs (Müller et al, 1992). The Colombian shoshonitic rocks are related to the continental arc after the collision of the Chocó-Panamá Block (Lara et al, 2018). Basic to intermediate shoshonitic magmas are generally considered to have formed by low degrees of melting of previously modified mantle rocks, where LILEs and LREEs have been transferred from a subducting slab (e.g., Aldanmanz et al, 2000;Morrison,1980).…”

Section: The Shoshonitic Seriesmentioning

confidence: 99%

“…12 to 6 Ma) volcanoclastic-sedimentary sequence located in the middle and northern parts of the valley, and represents a distinctive magmatic occurrence (Figure 2). The CF was deposited within the intramontane, semi-isolated Amagá Basin, which formed between the basement rocks from the Western and Central Cordilleras in the northernmost Colombian Andes (Figure 2; Lara et al, 2018). The CF mainly comprises basic tholeiitic magmas, linked to crustal thinning and basin extension (Bernet et al, 2020;Dunia, 2005;Jaramillo, 1976;Jaramillo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Field relationships in the Amagá Basin indicate a volcanic province that formed due to the presence of a short-lived magmatic event resulting from transtensional tectonics in a sedimentary basin. The underlying extensional event of the Amagá Basin would have begun during the early Miocene (23-21 Ma), indicated by the sedimentation of the AF (Lara et al, 2018;Ramírez et al, 2015), and it seems to be associated with Panamá-Chocó Block docking against the South American Plate approximately 25-23 Ma (Farris et al, 2011) via a fast-oblique convergence phase along a sinistral strike-slip fault (Müller et al, 2008 & Zapata, 2014). There are records, from 12.5 to 9 Ma, of garnet-bearing and adakite magmatism in the south (Figure 2; Bissig et al, 2017).…”

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confidence: 99%

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Chapter 12

SGC¹

2019

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A transtensional basin setting originated the Combia Volcanic Province in the northern Andes of Colombia. Volcanism is heterogeneous encompasses tholeiitic, calc-alkaline, and shoshonitic magmatic series. A review of existing geochemical and geochronological data suggests that all magma series coexisted between 12 and 6 Ma but originated from different processes. Tholeiites formed via the melting of a modified primitive mantle source, with limited sedimentary or continental-contaminant input. Calc-alkaline magmas are mainly adakitic and formed from fractionation of garnet and amphibole at high pressures from a hydrous melt from an enriched source. Petrographic and mineral chemistry of garnet-bearing rocks indicate that magmas underwent at least three ascent phases that include: (1) crystallization of high-pressure phenocryst phases at 900 °C and 1200 GPa in a mantle-derived melt, (2) stalling of differentiated magma at lower-pressure conditions, and (3) stalling at shallower conditions, where decompression occurred. Shoshonitic magmas formed via from a mantle with sedimentary or continental-contaminant input source in the plagioclase stability field. Finally, Combia Volcanic Province's formation was enhanced by the Caldas Tear, a slab window developed by the subduction of the Sandra Ridge beneath the South American Plate.

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Section: El Botón Magmatic Arcmentioning

confidence: 99%

Section: The Shoshonitic Seriesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chapter 12

SGC¹

2019

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“…The decrease of sulphides and increase of oxides could indicate change in the depositional environment or climatic conditions (e.g. Nichols, 2009;Lara et al, 2018) while the increase of ultrastable minerals with prismatic crystals such as zircon can indicate proximity of the source area. On the other hand, the increase of metastable minerals (such as olivine and augite) and the proportions of white mica could be related with the compositional change of the source area.…”

Section: Heavy Minerals Analysismentioning

confidence: 99%

Provenance of the Ciénaga de Oro Formation: unveiling the tectonic evolution of the Colombian Caribbean margin during the Oligocene - Early Miocene

Manco-Garcés¹,

Marín-Cerón²,

Sánchez-Plazas³

et al. 2020

Bol. Geol.

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A stratigraphic section in the San Jacinto fold and thrust belt located at northwestern Colombia was studied. This section displays part of the Oligocene-Early MioceneCiénagade Oro Formation(COF).This work analyses thesedimentsprovenance usinga multi-tool approach which include: (I)conglomerate and sandstonecounting clastwith mesh,(II)heavy mineralsassemblages, (III)paleocurrents and (IV) U/Pb detrital zircon ages.The sedimentary sequence was deposited in deltaic to transitional environment deposition, with reduction in the waves and tidal effect, and increase in the dominance of transitional river processes upward the section. Two main source areas have been identified from a dissected arc province: a main granitic to pegmatitic and a secondary basic igneous source rocks, located to the east and southwest of the current position. Detrital zircon U-Pb geochronology analysis display four age populations: (I) Devonian-Permian, (II) Permian-Triassic, (III) Jurassic and (IV) Cretaceous, with maximum deposition ages of 75.2±0.9 Ma in the lower part of the section, 68.9±0.6 Ma in the middle and 74.5±0.7 Ma for the upper part. It is proposed that COF was sediment-supplied by a south-to-north fluvial system, which drained exposed basement blocks and their late Cretaceous to Paleogene sedimentary cover during the Oligocene. This fluvial system carried sediments from late Cretaceous plutonslike the AntioqueñoBatholith and mafic/ultramafic rocks, which make up the basement of the Western and Central Cordilleras

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