| Texto completo | |
| Autor(es): |
Loureiro, Gabriel de Almeida Moura
;
Florisbal, Luana Moreira
;
Louro, Vinicius
;
Fontoura, Gabriel Martins
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOURNAL OF GEODYNAMICS; v. 166, p. 19-pg., 2025-12-01. |
| Resumo | |
Large Igneous Provinces (LIPs) are characterized by vast volumes of mafic lava flows and a complex network of intrusive rocks, including dike swarms, sill complexes, and layered intrusions that, together, compose the magmatic plumbing system. These magmatic events typically occur over short durations (1-5 Myr) and provide critical insights into magmatic processes and their interactions with surrounding rocks. Recent geological mapping in the Southern Brazilian Coastal region reveals a connected network of sills and dikes that represent the exposed plumbing system of high-Ti Urubici (Khumib) magma type of the Parana Etendeka Magmatic Province (PEMP). To better constrain the extent of the intrusive bodies and investigate their link to the lava flows, we integrated field, petrographic, airborne magnetic, and whole-rock geochemical data. Magnetic field products corroborated with the field-observed interconnected intrusive bodies and highlighted the concentration of deep and shallow, large magma chambers within the area, as well as the connectivity between these reservoirs and vertical conduits. Geochemical analysis indicated that sills, dikes, and lava flows share a common origin linked to the high-Ti Urubici (Khumib) magma type that evolved through fractionation in shallow level magma chambers and partially assimilate melts from country rocks in the conduits. The results of our holistic geophysical and geological approach demonstrated that contamination and melting processes are intricately linked to the dynamics of the transcrustal high-Ti Urubici plumbing system and highlights the shallow emplacement of large volumes of mafic sills and the melting of the country rocks as a cause-effect relation. (AU) | |
| Processo FAPESP: | 19/22084-8 - A Província Magmática Paraná: petrogênese, cronologia e impacto ambiental do magmatismo toleítico, alcalino e silícico Cretáceo na Plataforma Brasileira |
| Beneficiário: | Valdecir de Assis Janasi |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |