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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The role of Ediacaran synkinematic anatectic rocks and the late-orogenic charnockitic rocks in the development of the hot Aracuai belt

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Author(s):
Cavalcante, Carolina [1, 2] ; Meira, Vinicius T. [3] ; Magalhaes, Nivea [4] ; Hollanda, Maria Helena B. M. [5] ; Oliveira, Euridice [5]
Total Authors: 5
Affiliation:
[1] Univ Fed Parana, Ctr Politecn, Dept Geol, Av Cel Francisco Heraclito dos Santos, BR-81531980 Curitiba, Parana - Brazil
[2] Univ Tromso Arctic Univ Norway, Dept Geosci, Dramsveien 201, N-9037 Tromso - Norway
[3] Univ Estadual Campinas, Dept Geol & Nat Resources, R Carlos Gomes 250, Cidade Univ, BR-13083855 Campinas, SP - Brazil
[4] Univ St Andrews, Sch Earth & Environm Sci, Bute Bldg, Queens Terrace, St Andrews KY16 9TS, Fife - Scotland
[5] Univ Sao Paulo, IGc, Rua Lago 562, BR-05508080 Sao Paulo, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Precambrian Research; v. 365, OCT 2021.
Web of Science Citations: 0
Abstract

The orogenic evolution of the hot Aracuai belt is characterized by continuous magmatic activity, with magmas of different compositions recording a long-lived (similar to 630 to similar to 530 Ma) tectono-thermal evolution in response to convergence between the Congo and Sao Francisco continents during the West Gondwana amalgamation. Geochemical data from the Carlos Chagas domain (CCD) and the Nova Venecia Complex (NVC), in the hinterland of this belt, show that these rocks contain high amounts of heat producing elements - HPEs - (Th, U, and K) and have a dominant peraluminous signature, suggesting that they result from partial melting of continental crust. The CCD is intruded by post-collisional charnockites that have a dominant shoshonitic signature, interpreted as representing magmas from an enriched mantle reservoir with a variable amount of crustal contamination. Detailed morphological investigations at the macro- and micro-scales show that the CCD contains remnants of residuum material from metamorphic reactions associated with textures that attest to melt crystallization. This reinforces the interpretation that the CCD is locally derived, i.e., it represents an in-source subhorizontal rheologically weak layer of migmatites and parauthoctonous granites that formed during the orogenic thickening. The CCD likely triggered the formation of an orogenic plateau and a geological setting in which high temperature conditions could be sustained for tens of millions of years. In such a setting, continuous heat supply from radiogenic decay might have been the main heat source for the compositionally diverse magmatism during most of the orogenic evolution of the Aracuai belt. (AU)

FAPESP's process: 10/03537-7 - Tectonoseismic Study of the Carlos Chagas Leucogranite and Adjacent Units, Araçuaí Belt (Eastern Brazil).
Grantee:Geane Carolina Gonçalves Cavalcante
Support Opportunities: Scholarships in Brazil - Doctorate