Contrasting tectonic settings in Northern Chon Aike Igneous Province of Patagonia: subduction and mantle plume-related volcanism in the Marifil formation |
| |
| Authors: | Cecilia Pavón Pivetta Daniel Gregori Leonardo Benedini Mirta Garrido Leonardo Strazzere Mauro Geraldes |
| |
| Institution: | 1. Departamento de Geología, Universidad Nacional del Sur , Bahía Blanca, Argentina;2. INGEOSUR-CONICET , Bahía Blanca, Argentina cpavonpivetta@gmail.com https://orcid.org/0000-0002-7322-7965;4. INGEOSUR-CONICET , Bahía Blanca, Argentina https://orcid.org/0000-0003-2345-1878;5. INGEOSUR-CONICET , Bahía Blanca, Argentina https://orcid.org/0000-0001-7072-466X;6. Departamento de Geología, Universidad Nacional del Sur , Bahía Blanca, Argentina;7. INGEOSUR-CONICET , Bahía Blanca, Argentina;8. Departamento de Geologia Regional e Geotect?nica, Faculdade de Geologia, Universidade do Estado do Rio de Janeiro , Rio de Janeiro, Brasil https://orcid.org/0000-0003-2914-2814 |
| |
| Abstract: | ABSTRACT 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. |
| |
| Keywords: | Subduction and mantle plume-related volcanism North Patagonian Massif Marifil formation Argentina |
|
|
![ORCID Icon]({"type":"image","src":"/templates/jsp/images/orcid.png"} "ORCID Icon")
https://orcid.org/0000-0002-7322-7965;4. INGEOSUR-CONICET , Bahía Blanca, Argentina