Geophysical Networks in Colombia

Vargas, Carlos; Caneva, Alexander; Monsalve, Hugo; Salcedo, Elkin de J.; Mora, Héctor Plascencia

doi:10.1785/0220170168

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…In the central part of the Colombian Central Cordillera (Figure 1A) is located the Tapias dome (4.467706, -75.363457, 2525 masl), a monogenetic volcano situated ~5 km SE of the Holocene Cerro Machín composite volcano (4.486817, -75.386178, 2750 masl;Figure 1B and 1C). Both volcanoes are built over Permo-Triasic to Jurassic rocks from the Cajamarca Complex, characterized by a package of orthogneiss, phyllites, quartzites, greenschist, and graphite schists (Vargas et al, 2005;Villagómez et al, 2011;Blanco-Quintero et al, 2014). They form the southernmost expression of volcanism in the San Diego -Cerro Machín Volcano-Tectonic Province (SCVTP) (Figure 1B).…”

Section: Introductionmentioning

confidence: 99%

The relation between monogenetic and polygenetic dacitic volcanism. Case study from Tapias dome (<95 ka) and Cerro Machín volcano (<50 ka), Colombia

et al. 2023

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The Tapias lava dome is located ~5 km SE of the explosive, Cerro Machín polygenetic volcano, both located on the Colombian Central Cordillera. The edifices have been interpreted as generated by the same magmatic system; however, the genetic and temporal relations between both edifices have not been established. In this work, the Tapias dome is studied using petrographic characterizations, mineral-, whole-rock- and isotopic chemistry, geothermobarometric calculations, and a K/Ar radiogenic age, and subsequently it is explored the relationship with the Cerro Machín. The rocks from Tapias dome are porphyritic with phenocrysts of plagioclase (An28-48), amphibole (tschermakite and magnesiohastingsite), biotite, quartz, and Fe-Ti oxides, embedded in a glassy groundmass. Petrographically, two types of amphibole crystals were recognized: type I, which is homogeneous, and type II, which displays different rims. The composition of Tapias is dacitic (SiO2: 66.59 wt.%) with calc-alkaline affinity. Our geothermobarometric calculations indicate that type I amphibole crystallized at 871-874°C, between 10.2 and 10.4 km depth. The core of the type II amphibole crystallized at 852-920°C, between 8.5 and 12.3 km depth, while its rim did it at higher temperatures (880-973°C), but at similar depths (9.1-11.8 km). The K/Ar radiogenic age obtained for the groundmass shows an emplacement age not older than 95 ± 0.05 ka. When comparing the results to the Cerro Machín, it is noted that the mineral and compositional characteristics are nearly identical. These results suggest that indeed both volcanoes share the same magmatic system and are fed by magma hosted between ~9 and ~12 km depth. Moreover, it is proposed that the vent location of both edifices, as well as the time gap between the eruption at Tapias and the beginning of the activity at the Cerro Machín (~50 ka), are the result of crustal deformation caused by the interaction between the Otú-Pericos and Ibagué faults.

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Section: Introductionmentioning

confidence: 99%

The relation between monogenetic and polygenetic dacitic volcanism. Case study from Tapias dome (<95 ka) and Cerro Machín volcano (<50 ka), Colombia

et al. 2023

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“…associated with magnetic and electric field sensors) completing a total of 8 channels per station. All the data acquired is sent near real-time to a computer server in Bogotá (Solano Fino 2017, Vargas et al 2018). On the other hand, the National Antarctic Direction (Dirección Antártica Nacional -DNA) carries out the programming, planning, coordination, direction, control, and dissemination of the Argentine Antarctic activity ([1] -Ministerio de Relaciones Exteriores, 2019).…”

Section: Introductionmentioning

confidence: 99%

Quasi real-time electromagnetic and greenhouse gases monitoring station at Seymour - Marambio Island, Antarctica

Solano¹,

Vargas²,

Gulisano³

2021

Czech Polar Rep.

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A new permanent geophysical station was installed in the Seymour-Marambio Island, Antarctica, for monitoring electromagnetic, CO2, and CH4 gas signals. Those signals require specialized low noise instruments and the survey shall be carried out in places far away from cultural noise, such as populated human settlements. The most suitable place would be near the Earth's poles, where noise is the lowest possible. To measure these variables, the Geophysical Instrumentation Laboratory (Laboratorio de Instrumentación Geofísica - LIG) of the Universidad Nacional de Colombia, in a partnership with the Instituto Antártico Argentino (IAA) under the Argentinean National Antarctic Direction (Dirección Nacional del Antártico - DNA), deployed the COCOAonMEAT project, oriented to design, built and install a low-cost station with time synchronization via GPS and data transmission in almost real-time. Since January 2020, the project monitors continuously (24/7) seven variables: three magnetic components, two electric dipoles, methane (CH4), and carbon dioxide (CO2) gas. Due to operative facilities and its low electromagnetic noise, the place chosen for its installation was the Argentinean Marambio Scientific Base in the Antarctic Peninsula, with the Multidisciplinary Antarctic Laboratory's collaboration (Laboratorio Multidisciplinario Antártico en la Base Marambio - LAMBI). This station provides valuable information on electromagnetic signals and greenhouse gases related to regional tectonic activity and local perturbations associated with global climate change.

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Tsunami Modeling in the South American Subduction Zone Inferred from Seismic Coupling and Historical Seismicity

Medina

Riquelme

Fuentes

et al. 2021

Pure Appl. Geophys.

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Geophysical Networks in Colombia

Cited by 9 publications

References 12 publications

The relation between monogenetic and polygenetic dacitic volcanism. Case study from Tapias dome (<95 ka) and Cerro Machín volcano (<50 ka), Colombia

The relation between monogenetic and polygenetic dacitic volcanism. Case study from Tapias dome (<95 ka) and Cerro Machín volcano (<50 ka), Colombia

Quasi real-time electromagnetic and greenhouse gases monitoring station at Seymour - Marambio Island, Antarctica

Tsunami Modeling in the South American Subduction Zone Inferred from Seismic Coupling and Historical Seismicity

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