2019
DOI: 10.1007/978-3-319-76132-9_3
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The Proterozoic Basement of the Western Guiana Shield and the Northern Andes

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Cited by 16 publications
(24 citation statements)
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“…These studies have led in the 70th to the recognition of the Mitú Migmatitic Complex (Galvis et al, 1979;Rodríguez et al, 2011), later called the Mitú Complex (Bonilla et al, 2019;López et al, 2007) as part of the 1.80-1.55 Ga Rio Negro-Juruena Geochronological Province (Figure 2) in Colombia (Tassinari et al, 1996;Tassinari and Macambira, 1999). Large parts of the Mitú Complex (Figure 3) are composed of monzogranites with calc-alkaline characteristics, and meta-to peraluminous affinity with an U-Pb LA-MC-ICPMS age for the Mitú granite of 1574 ± 10 Ma (Ibáñez-Mejía et al 2011), as well as of other granites: Among the clearly metamorphic rocks prevail quartzo-feldspathic gneisses with zircon U-Pb ages between 1800-1760 Ma (Bonilla et al, 2019;Cordani et al, 2016;Kroonenberg, 2019;López et al, 2007). Medium grade amphibolite facies metamorphic rocks within a series of essentially juvenile magmatic arcs in the Rio Negro Juruena province are interpreted as subductionrelated by several workers (Cordani et al, 2016;Tassinari and Macambira, 1999).…”
Section: Eastern Colombian Basement (1800-1500ma)mentioning
confidence: 99%
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“…These studies have led in the 70th to the recognition of the Mitú Migmatitic Complex (Galvis et al, 1979;Rodríguez et al, 2011), later called the Mitú Complex (Bonilla et al, 2019;López et al, 2007) as part of the 1.80-1.55 Ga Rio Negro-Juruena Geochronological Province (Figure 2) in Colombia (Tassinari et al, 1996;Tassinari and Macambira, 1999). Large parts of the Mitú Complex (Figure 3) are composed of monzogranites with calc-alkaline characteristics, and meta-to peraluminous affinity with an U-Pb LA-MC-ICPMS age for the Mitú granite of 1574 ± 10 Ma (Ibáñez-Mejía et al 2011), as well as of other granites: Among the clearly metamorphic rocks prevail quartzo-feldspathic gneisses with zircon U-Pb ages between 1800-1760 Ma (Bonilla et al, 2019;Cordani et al, 2016;Kroonenberg, 2019;López et al, 2007). Medium grade amphibolite facies metamorphic rocks within a series of essentially juvenile magmatic arcs in the Rio Negro Juruena province are interpreted as subductionrelated by several workers (Cordani et al, 2016;Tassinari and Macambira, 1999).…”
Section: Eastern Colombian Basement (1800-1500ma)mentioning
confidence: 99%
“…This Mitú Complex is itself a portion of the 1.86-1.55 Ga Rio Negro-Juruena Geochronological Province (Tassinari et al, 1996;Tassinari and Macambira, 1999). Older (~1.98 Ga) metavolcanic rocks of the Atabapo-Río Negro Gneiss may testify remains of the Trans-Amazonian basement (Kroonenberg, 2019) and not of the Mitú Complex accretion. This complex was affected by several magmatic and tectonic episodes during the Mesoproterozoic (1.6-1.0 Ga), among them (in Colombia 1.40-1.34 Ga) intraplate A-type Figure 1 The Amazonian Craton in South America and Geochronological Provinces after Tassinari and Macambira (1999).…”
Section: Introductionmentioning
confidence: 97%
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“…La configuración geológica del norte de la margen Suramericana hasta el Jurásico Superior estaba conformada al este por el Escudo de Guyana (mitad norte del cratón amazónico), con edades entre 2,5-1,5 Ga (Priem et al, 1982;Restrepo-Pace y Cediel, 2019) (Figura 1). La parte más occidental del escudo, está constituida por granitoides y rocas metamórficas de alto grado, que hacen parte del cinturón de Río Negro (1,84-1,72 Ga) (Tassinari, 1981;Tassinari y Macambira, 1999;Kroonenberg, 2019), el cual está intruido por granitoides anorogénicos de 1,55 Ga (e.g. Granito rapakivi de Parguaza) y cubierto localmente por areniscas y meta-areniscas de Naquén, Pedrera y Tunuí (Kroonenberg, 2019).…”
Section: Marco Geológicounclassified
“…Al oeste del Sistema de Fallas del Borde Llanero (límite del dominio cratónico de la margen de los Andes del Norte), se levanta la margen Andina, conformada por un basamento de rocas metamórficas de alto grado (facies granulita a anfibolita alta), probablemente formadas durante la colisión continental de Amazonia y Laurentia durante la Orogenia Grenvilliana (Kroonenberg, 1982;Cordani et al, 2010;Ibáñez-Mejía et al, 2011;Kroonenberg, 2019) y representada por bloques conformados por las unidades Grupo Garzón, Neises de Mancagua y Guapotón, Migmatitas de Las Minas, Granito de El Recreo, Neis de San Lucas, Granulita de Los Mangos, Neis de Buritaca y Neis de Jojoncito (Kroonenberg y Diederix, 1982;Rodríguez, 1995aRodríguez, , 1995bVelandia et al, 1996Velandia et al, , 2001aVelandia et al, , 2001bRodríguez et al, 2003;Jiménez-Mejía et al, 2006;Ibáñez-Mejía et al, 2011Cuadros, 2012;Cuadros et al, 2014;Tschanz et al, 1969aTschanz et al, , 1974Ordóñez-Carmona et al, 2002;Piraquive, 2017), con edades entre 1,2 a 0,85 Ga (Ibáñez-Mejía et al, 2011.…”
Section: Marco Geológicounclassified