Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Building an inversely zoned post-orogenic intrusion in the Neoproterozoic-Cambrian Aracuai orogen (Brazil)

Full text
Author(s):
Bellon, U. D. [1] ; D'Agrella-Filho, M. S. [1] ; Temporim, F. A. [1] ; Junior, G. F. Souza [1] ; Soares, V, C. C. ; Amaral, C. A. D. [1] ; Gouvea, L. P. [2] ; Trindade, R. I. F. [1]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Dept Geofis, Sao Paulo - Brazil
[2] Univ Fed Rio de Janeiro, Dept Geol, Rio De Janeiro - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF STRUCTURAL GEOLOGY; v. 149, AUG 2021.
Web of Science Citations: 1
Abstract

Post-orogenic plutons are excellent recorders of the last stages of collapsing orogens. In the NeoproterozoicCambrian Aracuai orogen (Brazilian Southeast), one of the Brasiliano orogenies (Western Gondwana), voluminous amounts of Cambrian magmatism crop out. The Venda Nova pluton (VN) is located at the southern portion of the AO, exhibiting a norite/charnockitic west-ring in contact with a syenomonzonite that envelops an alkaligabbro core with distinct geochemical signatures. To explore the tectonic significance of this post-orogenic pluton in the AO, anisotropy of magnetic susceptibility (AMS) together with a microstructural analysis were performed. AMS data reveals, majorly, a concentric magnetic foliation/lineation pattern, implying that buoyancy forces controlled the magma emplacement of syenomonzonites and gabbros, while a previous pulse of a charnockitic intrusion was deformed by their intrusion. Restrict solid-state deformation (following the regional trend) inside the pluton could result of the reactivation of an emplacement structure in the last stages of VN crystallization. The emplacement of inversely zoned post-orogenic plutons through deep conduits in the colder forelands of the AO, such as the VN, might record different stages of a large collapsing orogen in a single plutonic body. (AU)

FAPESP's process: 16/06114-6 - The Neoproterozoic Earth System and the rise of biological complexity
Grantee:Ricardo Ivan Ferreira da Trindade
Support Opportunities: Research Projects - Thematic Grants