Vertical deformation partitioning across a collapsing large and hot orogen

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Temporim, F. A. ; Ferreirae da Trindade, Ricardo Ivan ; Egydio-Silva, Marcos ; Angelo, Tiago Valim ; Tohver, Eric ; Soares, Caroline Cibele ; Gouvea, Lucas Pequeno ; Mendes, Julio Cesar ; Medeiros, Silvia Regina ; Pedrosa-Soares, Antonio Carlos ; Silva, Gabriel Gomes

• Tipo de documento: Artigo Científico
• Fonte: TERRA NOVA; v. 35, n. 1, p. 9-pg., 2022-10-17.

Resumo

Featuring 3 000-km-long large and hot orogen, the Mantiqueira Province provides a rare opportunity to study the process of gravitational collapse at mid to deep crustal levels. Distinct but contemporary (similar to 500 Ma) post-collisional intrusions show structures and anisotropy of magnetic susceptibility (AMS) fabrics related to their emplacements, recording different flow patterns. In southern deep-seated intrusions, ellipsoidal-shaped roots with gabbroic-to-hybrid cores surrounded by granitic rocks show concentric patterns of AMS fabrics that cut across the NE-trending regional foliation. In contrast, northern intrusions, exposed as the upper sections of batholith-size bodies of coarse-grained granite emplaced at the shallow to mid-crust, show general NS-trending magnetic fabrics roughly parallel to strike of the orogen and the regional foliation of host rocks. These contrasting magnetic patterns from shallow to deeper crust suggest vertical magma migration from the overthickened orogenic core to be emplaced across its thinner stretched flanks during the gravitational collapse of the orogenic edifice. (AU)

• Processo FAPESP: 16/06114-6 - O Sistema Terra e a evolução da vida durante o Neoproterozoico
• Beneficiário: Ricardo Ivan Ferreira da Trindade
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/11672-0 - Paleogeografia no ediacarano e cambriano: estudo dos corpos intrusivos pós-colisionais da faixa araçuaí (es)
• Beneficiário: Filipe Altoé Temporim
• Modalidade de apoio: Bolsas no Brasil - Doutorado