The Guamuéz (La Cocha) Lake

Duque-Trujillo, José; Hermelín, Michel; Toro, Gloria

doi:10.1007/978-3-319-11800-0_17

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Pyroclasts are dark red in color and form layers of varying thickness; some of these deposits are interpreted as explosion breccias (Núñez, 2003). Duque-Trujillo et al (2016) highlight the presence of a "hummocky" morphology, consisting of numerous small mounds that they consider a "debris avalanche" produced by a flank collapse.…”

Section: Guamuez-sibundoy Regionmentioning

confidence: 99%

Chapter 10

SGC¹

2019

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Small-volume basaltic volcanoes in Colombia are located on the eastern flank of the Central Cordillera and in the Upper Magdalena Valley, in a rear-arc position with respect to the active arc front. These are mainly small volcanoes that form predominantly scoria cones with associated lava flows, pyroclastic rings, and isolated lava flows, which have a composition that varies from highly subsaturated nephelinites, basanites, and alkaline basalts to basalts and subalkaline andesites. In rear-arc position to the segments of the active volcanic front, three main groups are recognized with this type of volcanoes. The first group, located in the south, has been recognized mainly through photogeological studies in Nariño, Putumayo, and Caquetá Departments. From this group, only the nephelinic Sibundoy Volcano (Muchivioy) has been directly studied through field-based geological observations. A second group in the Huila Department has been denominated in the literature with the name of "Alkalibasaltic Volcanic Province", in which three monogenetic volcanic fields are defined: Moscopán, Isnos-San Agustín, and Acevedo, taking into account their geographical position, geochemical characteristics, and structural setting. However, the interaction of the tectonic and structural factors give rise to differences and similarities in the products emitted by these volcanoes, making this volcanic province a clear example of the difficulty of defining a monogenetic volcanic field. In addition, in this group, for the first time four scoria cones with associated lava flows are reported, that were previously known as "Basaltos de Acevedo" of ultramafic character. The third group, called in this work the Metaima Monogenetic Volcanic Field, is located in the Tolima Department and corresponds to basalt and calc-alkaline high-magnesium (Mg# = 65-70) basaltic andesites that may represent primary magmas.The presence of this volcanism inferred to be related to the complex tectonic configuration of the Andean North Volcanic Zone due to the rupture of the Farallón Plate and the formation of the Panamá Basin in the Miocene. Despite the lack of radiometric dating, this volcanism likely spams an age range from the Pliocene -Pleistocene (?) to the Holocene based on their morphometry, preservation, or stratigraphic considerations. The geomorphology and the preliminary morphometric analysis of the volcanic centers suggest a very recent age for some of them, even with the possibility of having been formed by historical eruptions, according to some reports that should be analyzed in greater detail.

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Section: Guamuez-sibundoy Regionmentioning

confidence: 99%

Chapter 10

SGC¹

2019

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Optimización del monitoreo de la transparencia del agua, por medio de MOD09GA

Eraso¹,

Martínez

2021

Cien.Ing.Neogranadina

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El lago Guamués (LG) es considerado humedal Ramsar desde el 2000. Debido a su importancia, los ecosistemas lénticos como el LG requieren de programas de monitoreo que sobrepasen su cobertura espacial y temporal. En este estudio se demuestra que usar productos de reflectancia de superficie, generados por el sensor Modis, puede ser útil para verificar la dinámica espaciotemporal de la profundidad medida con el disco de Secchi (PDS), en el periodo 2001-2020. Para calibrar el modelo, se utilizó una imagen coincidente con los trabajos de campo realizados; se correlacionaron los datos de transparencia de la columna de agua medida con el disco de Secchi con los píxeles de la imagen captados en la banda centrada en los 858,5 nm. Para validar el modelo, se utilizó el método Leave out One Cross Validation (LOOCV). Así, se determinó que el modelo cuadrático presenta mejores resultados con un ajuste en su R2 = 0,74 y un error asociado a las observaciones inferior a los 0,013 m. El análisis espacial reveló que el LG presenta zonas localizadas en sus márgenes donde la PDS puede ser inferior a los 0,5 m. De la misma forma el promedio en su PDS para la imagen del 24 de abril es de 3,87 m. El análisis temporal del lago indica que en 2006-2008 y 2017-2020, se ha presentado mayor variabilidad para los puntos observados, con valores de 3,3 y 2,8 m, respectivamente.

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The Guamuéz (La Cocha) Lake

Cited by 2 publications

References 5 publications

Chapter 10

Chapter 10

Optimización del monitoreo de la transparencia del agua, por medio de MOD09GA

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