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Keywords = Neoarchaean

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25 pages, 26414 KB  
Article
Decoding the Structural Architecture of the Northern Copper Belt (Carajás Province) and Bacajá Domain Using Airborne Geophysics (Brazil)
by Luiz Fernandes Dutra, Gustavo Henrique Coelho de Melo, Brener Otávio Luiz Ribeiro and Filipe Altoé Temporim
Minerals 2026, 16(3), 240; https://doi.org/10.3390/min16030240 - 26 Feb 2026
Viewed by 423
Abstract
Copper is a critical metal for the global energy transition. Yet, declining discovery rates and increasing demand necessitate more efficient mineral exploration strategies grounded in a mineral systems approach. The Carajás Province (Amazonian Craton, Brazil) is one of the world’s premier copper-producing regions, [...] Read more.
Copper is a critical metal for the global energy transition. Yet, declining discovery rates and increasing demand necessitate more efficient mineral exploration strategies grounded in a mineral systems approach. The Carajás Province (Amazonian Craton, Brazil) is one of the world’s premier copper-producing regions, hosting several iron oxide–copper–gold (IOCG) and related deposits. The Northern Copper Belt (NCB), located near the boundary between the Carajás and Bacajá domains, records a multiphase deformational and metallogenetic evolution from the Neoarchaean to Paleoproterozoic. Despite extensive previous studies, uncertainties remain regarding the geometry, depth, and continuity of the regional structures that control copper mineralization, as well as the nature of the tectonic boundary between the Carajás and Bacajá domains. As a result, through an integration of airborne magnetic, gravity, gamma-ray spectrometry, morpholineament, and spatial analyses, we characterized the tectono-structural framework of the NCB and the southern Bacajá Domain. This will provide new constraints on the geodynamic evolution of this world-class copper metallogenic belt, elucidating crustal-scale structures and patterns of hydrothermal alteration and fluid pathways, and enhancing understanding of the potential for further discoveries. Full article
(This article belongs to the Section Mineral Exploration Methods and Applications)
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12 pages, 1482 KB  
Review
Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics
by Jaana Halla
Geosciences 2018, 8(9), 353; https://doi.org/10.3390/geosciences8090353 - 17 Sep 2018
Cited by 29 | Viewed by 5421
Abstract
The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes [...] Read more.
The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics. Full article
(This article belongs to the Special Issue Geology of the Early Earth – Geodynamic Constraints from Cratons)
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