Publication: Sistema aluvio-lacustre del Mioceno temprano-medio de la cuenca de Collón Cura y controles en el desarrollo de diatomitas
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Asociación Geológica Argentina
Abstract
En esta contribución se presentan análisis sedimentológicos y composicionales que permitieron inferir los sistemas depositacionales y el aporte volcano-sedimentario de los depósitos del Mioceno temprano-medio de la Cuenca de Collón Cura. A partir de estos análisis se interpretó un sistema aluvial volcaniclástico relacionado lateralmente a un sistema lacustre somero de centro de cuenca caracterizado por la presencia de diatomitas. El desarrollo de estos sistemas responde a la interacción de procesos tectónicos, magmáticos y climáticos ocurridos en el retroarco Andino Patagónico, tales como la compartimentalización estructural inicial del antepaís, el aporte piroclástico intermitente y distal asociado del magmatismo de arco, y un clima templado sub-húmedo vinculado al Óptimo Climático del Mioceno y la incipiente sombra de lluvias. Este contexto resultó propicio para el desarrollo de diatomitas en los sistemas lacustres, siendo los controles volcánicos y climáticos quienes facilitaron el aporte de sílice y nutrientes necesario para su desarrollo.
The sedimentological and compositional analyzes presented in this contribution allowed inferring the depositional systems and the volcano-sedimentary supply of the early-middle Miocene deposits preserved in the Collón Cura Basin. A volcaniclastic alluvial system laterally related to a lacustrine system with diatomites developed towards the interior of the basin were interpreted. The development of these systems responds to the interaction of tectonic, magmatic and climatic processes occurred in the Andean Patagonian retro arc, such as the initial structural compartmentalization of the foreland, the intermittent and distal pyroclastic supply associated with the arc magmatism, and a temperate sub-humid climate linked to the Miocene Climatic Optimum and the incipient rain shadow effect. This context was conducive to the development of diatomites in the lacustrine system, with volcanic and climatic controls facilitating the contribution of silica and nutrients necessary for their growth.
The sedimentological and compositional analyzes presented in this contribution allowed inferring the depositional systems and the volcano-sedimentary supply of the early-middle Miocene deposits preserved in the Collón Cura Basin. A volcaniclastic alluvial system laterally related to a lacustrine system with diatomites developed towards the interior of the basin were interpreted. The development of these systems responds to the interaction of tectonic, magmatic and climatic processes occurred in the Andean Patagonian retro arc, such as the initial structural compartmentalization of the foreland, the intermittent and distal pyroclastic supply associated with the arc magmatism, and a temperate sub-humid climate linked to the Miocene Climatic Optimum and the incipient rain shadow effect. This context was conducive to the development of diatomites in the lacustrine system, with volcanic and climatic controls facilitating the contribution of silica and nutrients necessary for their growth.