Petrografía y geoquímica de las rocas piroclásticas y efusivas de la Formación Bocas (Triásico Superior-Jurásico Inferior) y efusivas de la Formación Nogontova (Macizo de Santander, Colombia)

Toro-Toro, Luz Mary; Cardona-Ríos, John Jairo; Moreno-Sánchez, Mario; Gómez-Cruz, Arley

doi:10.18273/revbol.v43n1-2021003

bol. geol.

2021

DOI: 10.18273/revbol.v43n1-2021003

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Petrografía y geoquímica de las rocas piroclásticas y efusivas de la Formación Bocas (Triásico Superior-Jurásico Inferior) y efusivas de la Formación Nogontova (Macizo de Santander, Colombia)

Luz Mary Toro-Toro

John Jairo Cardona-Ríos

Mario Moreno-Sánchez

et al.

Abstract: La secuencia de rocas volcánicas y volcano-sedimentarias reportadas en el segmento superior de la Formación Bocas, subyacen sedimentos rojos de la Formación Jordán, está constituida por derrames de lavas máficas a intermedias y rocas piroclásticas félsicas interestratificadas con lodolitas, areniscas y areniscas tobáceas. En este trabajo se exponen nuevos datos de campo, petrográficos y geoquímicos de una secuencia volcánica máfica y volcanoclástica félsica. En cercanías al corregimiento Las Bocas, las rocas b… Show more

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Cited by 3 publications

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Age and tectonic setting of Mesozoic extension constrained by the first volcanic events in the Eastern Cordillera and Middle Magdalena Valley, Colombia

Reyes,

Kley,

Mora

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Before the rise of the Northern Andes in Cenozoic time, Triassic to Jurassic extensional basins in northwestern South America accommodated predominantly continental strata partly intercalated with volcanic rocks. Coeval plutonism is attributed to a magmatic arc related to the subduction of the Farallon plate beneath South America. The basins later became involved in the Andean orogeny and are now partially exposed in the Eastern Cordillera and Middle Magdalena Valley of Colombia. We have employed (U/Pb) geochronology on zircons from Triassic-Jurassic felsic to intermediate volcanic and volcaniclastic rocks. Most of the ten samples have a substantial proportion of detrital zircons, but only three had no Mesozoic grains. The Mesozoic ages obtained range from ca. 201 Ma to ca. 177 Ma and overlap with published crystallization ages (K/Ar; Ar/Ar; U/Pb) from plutonic bodies. Volcanics from the Jordán and Girón formations are latest Triassic to Early Jurassic and synchronous with major plutonic activity. These ages constrain the early evolution of the extensional basins that formed from about the Triassic-Jurassic transition in an intra-arc position and facilitated the preservation of sediment and arc-derived volcanics. Middle Jurassic ages from the Noreán Fm. are synchronous with sparse plutonism west of the Middle Magdalena Valley. At this time, the magmatic arc had migrated westward, while intrusive activity in the Eastern Cordillera ceased. A geochemical rift signature only appears in scarce Early Cretaceous mafic intrusions that resumed magmatic activity in the Eastern Cordillera. This magmatism, now in a back-arc position, coincides with maximum subsidence of the large Cretaceous basin that extended across the older intra-arc rift basins. Extension and lithospheric thinning ceased by the end of the Early Cretaceous. Graphical abstract

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Age and tectonic setting of Mesozoic extension constrained by the first volcanic events in the Eastern Cordillera and Middle Magdalena Valley, Colombia

Reyes,

Kley,

Mora

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Dispersal of Late Triassic clam shrimps across Pangea linking northwestern Gondwana and central Pangea rift basins

Alarcón,

Colombi,

Gallego

et al. 2024

Sci Rep

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Clam shrimps are a group of freshwater crustaceans who prospered during the Late Triassic. They were abundant in lacustrine sedimentary records of continental basins distributed throughout Pangea during this time. However, they show significant taxonomic differences between the clamp shrimp faunas from the rift basins of central Pangea and the southern Gondwanan basins. In this contribution, we show new fossil clam shrimp assemblages from the lacustrine sedimentary successions of the Eastern Cordillera of Colombia (the Bocas and Montebel formations), providing information on the Late Triassic species that inhabited the northwestern Gondwana basins. This study demonstrates that the basins of northwestern Gondwana shared Norian clamp shrimp species with rift basins of central Pangea and differed in their faunas with the basins of the southern portion of Gondwana. In addition, the Late Triassic clam shrimps paleobiogeographic distribution reflects the dispersal of this fauna throughout fluvial-lacustrine environments established in the rift valleys along the central Pangea. Therefore, the rift valleys produced during the early fragmentation of central Pangea could have acted as corridors for dispersion. Simultaneously, rift valleys also provided paleobiogeographic barriers that isolated the central Pangea clam shrimp faunas from southern Gondwana.

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Magnetic Petrology applied to the characterization of Pegmatite Dykes in Eastern Colombia

Charry,

Molano,

Santacruz

et al. 2023

Earth sci. res. j.

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In the sector of San Jose, Macanal, and Tabaquen, in eastern Colombia, granitic rocks cut by pegmatite dikes and quartz veins appear with the presence of magnetite, ilmenite, and ilmenorutile. Using magnetic petrology and geochemistry concepts and methods, the main objective is to determine if these types of rocks are genetically related and how the fluid chemically evolves during its crystallization and cooling. This work was conducted in three stages. Petrography and opaque metallography for identifying the occurrence, paragenesis, and secondary processes that transform the oxides. In a second stage and utilizing an Electron Probe Microanalyzer (EPMA), 214 quantitative analyses (WDS) and four compositional maps for magnetite, ilmenite, and ilmenorutile were performed, measu- ring the oxides FeO, TiO2, V2O3, MgO, MnO, Nb2O5, Ta2O5, Al2O3, Ga2O3, NiO, CaO, Cr2O3, SnO, and WO3. Since magnetite and ilmenite are favorable geothermometers that also allow the calculation of oxygen fugacity, the ILMAT program was used to calculate these values. In closing, integrate the data with the magnetic susceptibility values. The results determine crystallization temperatures between 358-414 °C for the granitic-host rock and 402- 499 °C for pegmatites dykes, in a system where oxygen fugacity increases, the Mn2+ is enriched in the ilmenite, and magnetite preserves a low content of trace elements thorough the evolution of the fluid. Taken together with the martitization and exsolution of hematite and rutile within ilmenite found in the petrography, these results allow us to conclude that an oxide-silicate re-equilibration process controls the evolution of this magmatic-hy- drothermal fluid with a KUIlB cooling trend-type reaction. Based on the Al + Mn vs. Ti + V ratio, the signature of the magnetite is like the Lucky Friday mine’s signature studied by Nadoll. However, the analysis of the 95th percentile shows a different concentration of trace elements in the magnetite of both sectors. Therefore, a new field of discrimination is proposed for this environment of anorogenic pegmatites of the NYF family. Finally, the magnetic susceptibility is controlled only by the abundance of magnetite in each type of rock. The granitic host rocks have the highest susceptibility values, followed by pegmatites and quartz veins with the lowest.

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Petrografía y geoquímica de las rocas piroclásticas y efusivas de la Formación Bocas (Triásico Superior-Jurásico Inferior) y efusivas de la Formación Nogontova (Macizo de Santander, Colombia)

Cited by 3 publications

References 46 publications

Age and tectonic setting of Mesozoic extension constrained by the first volcanic events in the Eastern Cordillera and Middle Magdalena Valley, Colombia

Age and tectonic setting of Mesozoic extension constrained by the first volcanic events in the Eastern Cordillera and Middle Magdalena Valley, Colombia

Dispersal of Late Triassic clam shrimps across Pangea linking northwestern Gondwana and central Pangea rift basins

Magnetic Petrology applied to the characterization of Pegmatite Dykes in Eastern Colombia

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