Geological Map of Colombia 2015

Tapias, Jorge Gómez; Ramírez, Nohora Emma Montes; Melendez, M.; Gutiérrez, Fernando Alcárcel; Montoya, César Madrid; Diederix, Hans

doi:10.18814/epiiugs/2017/v40i3/017023

Cited by 19 publications

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“…Although not strictly within Colombian territory, other studies conducted in SW Venezuela and NW Brasil in the late seventies and early nineties were also seminal for developing a better understanding of the geology of the western Guiana Shield; these were published by Barrios (1983), Barrios et al (1985Barrios et al ( , 1986, Cordani et al (1979, Cordani et al (2016a) and Gómez et al (2017). Inset shows the location and boundaries of Colombian departments mentioned throughout the text.…”

Section: Figurementioning

confidence: 99%

“…The most extensive outcrops of Precambrian basement in Colombia are located in the eastern and southeastern portions of the Vichada and Guainía Departments (Figure 2), along the Orinoco, Guaviare, Inírida, Atabapo, Guainía, and Negro River basins (Gómez et al, 2017). Samples dated by U-Pb methods in this region, from the studies of Bonilla-Pérez et al (2013), Cordani et al (2016b), andIbañez-Mejia (2014) are mainly from outcrops located around the Orinoco, Inírida, and Atabapo Rivers.…”

Section: Geology Of Guainía and Vichada Near The Colombia-venezuela Bmentioning

confidence: 99%

“…The continental basement of eastern Colombia, stretching from the Andean deformation front in the Llanos foothills to the borders with Venezuela and Brasil in the Orinoco and Amazonas territories, is comprised by Precambrian rocks of the western Guiana Shield (Figure 1; Cordani et al, 2016a;Gómez et al, 2017). Although most of the crystalline basement east of the Andes is currently buried under the thick sedimentary cover of the Putumayo and Llanos Foreland Basins, exposures of Precambrian igneous and metamorphic rocks occur in theVichada, Guainía, Vaupés, Caquetá, and Guaviare Departments (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

“…Figure 2. Simplified geologic map of the westernmost Guiana Shield, adapted from the maps ofCordani et al (2016a) andGómez et al (2017). Inset shows the location and boundaries of Colombian departments mentioned throughout the text.…”

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The crystalline basement of eastern Colombia, east of the frontal deformation zone of the north Andean Eastern Cordillera, is comprised by Precambrian igneous, metamorphic, and sedimentary rocks of the western Guiana Shield. Designated in the late seventies with the all-embracing stratigraphic name of 'Mitú Migmatitic Complex', the age, petrology, and tectonic history of the Precambrian basement in eastern Colombia has remained one of the least explored issues in South American geology. This chapter aims to present a brief overview of recent advances made to improve our general understanding of the geology of this wide region, using a compilation of the available U-Pb, Sm-Nd, Lu-Hf, and δ 18 O isotopic data obtained using modern methods. Using all the available U-Pb geochronologic data we show that, in general: (i) The Precambrian basement of the western Guiana Shield exhibits magmatic crystallization ages in the range from ca. 1.99 to ca. 1.38 Ga, and (ii) that four broad periods of magmatic activity, two in the mid-to late-Paleoproterozoic (ca. 1.99 and ca. 1.81-1.72 Ga), one in the early Mesoproterozoic (ca. 1.59-1.50 Ga), and one in the mid Mesoproterozoic (ca. 1.41-1.39 Ga) dominate the geology of the area. The (whole-rock) Nd and combined (zircon) Hf-O datasets indicate a general lack of 'depleted mantle' like mid-Paleoproterozoic or Mesoproterozoic crust, thus indicating that either the Proterozoic sub-continental mantle in the region was not as radiogenic as global mantle evolution models would suggest, or that reworking of older crust might have played an important role in the geological and geochemical evolution of the western Guiana Shield. Therefore, although the geochronologic results confirm that most of the exposed basement in eastern Colombia can be broadly considered to be of Rio Negro-Juruena-like affinity, this belt exhibits some distinct isotopic characteristics relative to similar age domains exposed south of the Amazon Basin. Furthermore, we note that the geochronologic data obtained to this date has failed to clearly identify an early-to mid-Mesoproterozoic terrane boundary in the Colombian basement, thus opening the possibility that a Rondonian-San Ignacio-like province is not represented in the Guiana Shield. Based on these recent field, geochemical, and geochronological observations, we consider the long and extensively used term 'Mitú Migmatitic Complex' to be now inadequate and obsolete, and argue that the current state of the knowledge of the Colombian Precambrian basement is such that the community should move towards adopting Proterozoic

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Section: Figurementioning

confidence: 99%

Section: Geology Of Guainía and Vichada Near The Colombia-venezuela Bmentioning

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Section: Introductionmentioning

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“…Figure 2. Simplified geologic map of the westernmost Guiana Shield, adapted from the maps of Cordani et al (2016a) and Gómez et al (2017). Inset shows the location and boundaries of Colombian departments mentioned throughout the text.…”

Section: Proterozoicmentioning

confidence: 99%