Volcanismo postcolapso de la caldera Vilama, Mioceno superior, Puna argentino-boliviana

Abstract

Este trabajo se realizó a partir de la hipótesis de trabajo: "los centros volcánicos emplazados alrededor y por encima del domo resurgente de la caldera Vilama (Puna argentina-Altiplano boliviano) con posterioridad a su colapso, son representantes de la Etapa de Postcolapso de dicha caldera". De acuerdo con el modelo clásico de calderas resurgentes, para cumplir con dicha condición los centros volcánicos deberían estar formados por rocas derivadas del magma restante en la cámara magmática luego de la erupción formadora de la caldera. Para someter a prueba a esta hipótesis de trabajo se realizó un estudio petrológico de los centros volcánicos referidos, y luego se los comparó con la Ignimbrita Vilama, representante de la Etapa de Colapso de la caldera.

Hydrothermal fluids and where to find them: Using seismic attenuation and anisotropy to map fluids beneath Uturuncu volcano, Bolivia

“…This feature is therefore interpreted to be brine-saturated crust. Furthermore, this feature is particularly interesting as it lies beneath Cerro Loromayo (Fracchia, 2009;Soler et al, 2007; Cerro Loromayo summit at intersection of the profiles CC' and DD' in Figure 2), a volcano that could have exhibited activity as late as 0.9 Ma (Fracchia, 2009). Based on our Q P /Q S results, this feature appears isolated, with no vertical column-like feature below it.…”

“…Isolated features with Q P /Q S > 1 also exist. One such feature, beneath Cerro Loromayo (Fracchia, 2009;Soler et al, 2007), is shown in detail in Figures 2d-2f (labeled C). This feature also corresponds to a region of low resistivity, as do other Q P / Q S > 1 regions.…”

Hydrothermal Fluids and Where to Find Them: Using Seismic Attenuation and Anisotropy to Map Fluids Beneath Uturuncu Volcano, Bolivia

“…Isolated features with Q P /Q S > 1 also exist. One such feature, beneath Cerro Loromayo (Fracchia, 2009;Soler et al, 2007), is shown in detail in Figures 2d-2f (labeled C). This feature also corresponds to a region of low resistivity, as do other Q P / Q S > 1 regions.…”

“…This feature is therefore interpreted to be brine‐saturated crust. Furthermore, this feature is particularly interesting as it lies beneath Cerro Loromayo (Fracchia, 2009; Soler et al., 2007; Cerro Loromayo summit at intersection of the profiles CC’ and DD’ in Figure 2), a volcano that could have exhibited activity as late as 0.9 Ma (Fracchia, 2009). Based on our Q P / Q S results, this feature appears isolated, with no vertical column‐like feature below it.…”