Vertical deformation partitioning across a collapsing large and hot orogen

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 (~500 Ma) post‐collisional intrusions show structures and anisotropy of magnetic susceptibility (...

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Bibliographic Details
Published in:Terra nova (Oxford, England) England), 2023-02, Vol.35 (1), p.23-31
Main Authors: Temporim, F. A., Trindade, Ricardo Ivan Ferreirae, Egydio‐Silva, Marcos, Angelo, Tiago Valim, Tohver, Eric, Soares, Caroline Cibele, Gouvêa, Lucas Pequeno, Mendes, Julio Cesar, Medeiros, Silvia Regina, Pedrosa‐Soares, Antônio Carlos, Silva, Gabriel Gomes
Format: Article
Language:English
Subjects:
Anisotropy
Batholiths
Deformation
Fabrics
Flow pattern
Lava
Magma
Magnetic susceptibility
Rocks
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Summary: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 (~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.
ISSN:0954-4879
1365-3121
DOI:10.1111/ter.12625