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Contrasting tectonic settings in Northern Chon Aike Igneous Province of Patagonia: subduction and mantle plume-related volcanism in the Marifil formation

Version 3 2020-10-05, 16:50
Version 2 2019-10-14, 10:09
Version 1 2019-10-03, 08:36
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posted on 2020-10-05, 16:50 authored by Cecilia Pavón Pivetta, Daniel Gregori, Leonardo Benedini, Mirta Garrido, Leonardo Strazzere, Mauro Geraldes, Anderson Costa Santos, Paulo Marcos

The northern zone of the Chon Aike Igneous Province, located in the North Patagonian Massif, exhibits extensive outcrops of Jurassic volcanic rocks of the Marifil Formation. In the Arroyo Verde area, the initial volcanic stage of the Marifil Formation, that we denominate V0 (192.6 ± 2.5 Ma), includes coulées, megabreccias and lapilli tuffs assigned to plinian-type volcanism. This magmatism was generated by cold-wet-oxidized magmas that resemble those produced in active continental margins and volcanic arcs. The second stage, located unconformably over the first, includes welded lava-like ignimbrites, massive lapilli tuff and rhyolitic lava flow that resemble the Snake River-type volcanism. The magma that produces this volcanic stage exhibit the characteristics of hot-dry-reduced magmas emplaced in intraplate continental environments associated with continental rifting. This stage coincides with the V1 volcanic episode early recorded in the Marifil Formation.

Funding

The chemical analysis and petrographic sections were financed by the FONCYT under grant [PICT-BID-2013-2713] entitled ‘Características fisico-químicas de fluidos hidrotermales y edades de mineralizaciones’ and by Universidad Nacional del Sur under grant [24-H121] entitled ‘Gondwánico y Patagonídico del norte de Patagonia’.

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