Laboratorio de Geocronología en el Servicio Geológico Colombiano: avances sobre datación U-Pb en circones mediante la técnica LA-ICP-MS

Urueña, Mary Luz Peña; Rocha, Jimmy Alejandro Muñoz; Urueña, Cindy

doi:10.32685/0120-1425/boletingeo.44.2018.7

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…The new analyses were performed on rock chips that were crushed, pulverized, and sieved following the separation procedures of Castaño et al (2018) and analyzed via LA-ICP-MS according to the procedures described in Peña et al (2018). The zircons were concentrated in the Chemical Laboratory of the Servicio Geológico Colombiano, Medellín, using hydrodynamic and magnetic separation, although some samples were concentrated in the field by panning.…”

Section: Geochronologymentioning

confidence: 99%

Evolution of arc magmatic cycles from the Carboniferous to the Early Cretaceous in the western paleomargin of Gondwana, north of the Andes

et al. 2022

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This work presents a considerable volume of new and compiled data indicating that arc magmatism in the western paleomargin of Gondwana began in the Carboniferous and continued during the Permian and Early Triassic. Subsequently, the magmatism reactivated during the Early and Middle Jurassic due to the subduction of the Farallon Plate under the continental paleomargin. The arc pluton belts are distributed from the edge of the paleomargin toward the interior of the continent in the same orientation as the slab (west–east direction). During the Carboniferous, between ca. 333 Ma and ca. 300 Ma, magmatism formed small calcic metaluminous gabbro and leucotonalite plutons of tholeiitic to calc-alkaline affinity on the western margin of Gondwana. Later, the second belt of arc plutons formed during the Permian/Triassic (between ca. 300 Ma and ca. 234 Ma) and are represented by metaluminous to peraluminous calc-alkaline to high-K calc-alkaline batholiths and stocks of heterogeneous composition (granites, granodiorites, diorites, quartz monzonites, and monzonites), which were intruded by dikes and minor granite bodies during the Middle Triassic. Between ca. 214 Ma and ca. 186 Ma, peraluminous plutons of batholithic dimensions of monzogranitic to syenogranitic composition developed in the back-arc. Between ca. 197 Ma and ca. 186 Ma, back-arc magmatism occurred, while a new magmatic cycle began along the arc axis. At the end of the Jurassic, the magmatic arc cycle ended in the northwestern paleomargin of Gondwana (ca. 164 Ma). The intrusion ca. 159 Ma of porphyritic bodies of alkaline andesitic basalts toward the edge of the continental margin suggests the strangulation and collapse of the subduction zone in the mantle. To the west, off the continental margin, a new arc magmatic cycle began over a different continental terrane ca. 171 Ma and extended to ca. 138 Ma, giving rise to a belt of calcic to calcic-alkaline plutons emplaced in the Ordovician metamorphic (Anacona Terrane), Triassic (Tahamí Terrane), and Upper Jurassic (Tierradentro Orogen) rocks. The assemblage amalgamated to the western margin of Gondwana in this period.

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Section: Geochronologymentioning

confidence: 99%

Evolution of arc magmatic cycles from the Carboniferous to the Early Cretaceous in the western paleomargin of Gondwana, north of the Andes

et al. 2022

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“…Of these samples, from only six samples of lava and pyroclastic volcanic rocks, enough zircons were obtained for LA-ICP-MS U-Pb zircon dating. The rock samples were crushed, pulverized and sieved following the separation procedure of Castaño et al (2018) and analyzed by LA-ICP-MS according to the procedure described by Peña et al (2018). Most zircons were concentrated at the Chemistry Laboratory of Geological Surveys, Medellín headquarters, using hydrodynamic and magnetic separation and others were concentrated in the field using a gold pan.…”

Section: U-pb Geochronologymentioning

confidence: 99%

Volcanism of the La Quinta Formation in the Perijá mountain range

Rodríguez

Obando

2020

boletingeo

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This study reports new data on the petrography, total rock chemistry and U-Pb zircon geochronology of volcanic rocks of the La Quinta Formation that outcrop the western flank of the Perijá mountain range and the Cesar and La Guajira departments. The volcanic rocks consist of basaltic, andesitic, dacitic and rhyolitic lavas, and the volcaniclastic rocks consist of crystal-vitric and crystal-lithic tuffs and agglomerates of calc-alkaline affinity, formed in a continental margin arc setting. Geochronological data suggest that the La Quinta Formation was volcanically active for approximately 25 Ma, during which its composition varied from basaltic trachyandesites to rhyolites. U-Pb dating suggests that the volcanism began in approximately 191 Ma (Sinemurian age) and continued until approximately 164 Ma, with at least three periods of increased volcanic activity. The inherited zircons contain Triassic, Permian, Neoproterozoic and Mesoproterozoic populations, indicating that this arc was emplaced on rocks of the Chibcha Terrane along the South American paleomargin and that it is part of the same arc that formed the Jurassic volcanic rocks of the Sierra Nevada de Santa Marta, Cocinas and San Lucas mountain ranges and the Upper Magdalena Valley.

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“…Los análisis isotópicos de dos muestras (TCR-400 y LMC-095) se llevaron a cabo en el Laboratorio de Geocronología del Servicio Geológico Colombiano, siguiendo los procedimientos descritos en Peña-Urueña et al (2018). Los análisis se realizaron en un equipo de ablación Photon Machines con un láser Excimer de 193 nm, acoplado a un espectrómetro de masas tipo Element 2.…”

Section: Métodos De Trabajounclassified

vol. 41, n.° 1, enero-abril de 2019ISSN impreso: 0120-0283ISSN en línea: 2145-855329Petrografía, geoquímica y geocronología U-Pb de las rocas volcánicas y piroclásticas de la Formación Noreán al NW del Macizo de Santander, Colombia

et al. 2019

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Laboratorio de Geocronología en el Servicio Geológico Colombiano: avances sobre datación U-Pb en circones mediante la técnica LA-ICP-MS

Cited by 13 publications

References 22 publications

Evolution of arc magmatic cycles from the Carboniferous to the Early Cretaceous in the western paleomargin of Gondwana, north of the Andes

Evolution of arc magmatic cycles from the Carboniferous to the Early Cretaceous in the western paleomargin of Gondwana, north of the Andes

Volcanism of the La Quinta Formation in the Perijá mountain range

vol. 41, n.° 1, enero-abril de 2019ISSN impreso: 0120-0283ISSN en línea: 2145-855329Petrografía, geoquímica y geocronología U-Pb de las rocas volcánicas y piroclásticas de la Formación Noreán al NW del Macizo de Santander, Colombia

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