Journal of the Geological Survey of Brazil <p><strong>SCOPE AND MISSION</strong></p> <p><strong>Journal of the Geological Survey of Brazil (JGSB)</strong> is a peer-reviewed, open-access periodical, published three times a year (April, August, and December) by the Geological Survey of Brazil, which is attached to the Ministry of Mines and Energy of Brazil.</p> <p>Our Mission is the dissemination of original, high-quality scientific research, and in-depth reviews of relevant subjects that cover all disciplines of the Earth Sciences in Brazil, and elsewhere, intending to be of interest to a broad audience of geological scientists.</p> en-US <p>The papers are published in the open access format, being freely available to any user, under a <a title="CC-BY Creative Commons license" href="" target="_blank" rel="noopener">CC-BY Creative Commons license</a>.&nbsp;</p> <p>By submitting this manuscript for evaluation, the authors are aware of&nbsp;the&nbsp;<a title="CC-BY Creative Commons license" href="" target="_blank" rel="noopener">CC-BY Creative Commons license</a>. In the case of manuscript approval, the author responsible for the manuscript (corresponding author), hereinafter referred to as CEDENTE (ASSIGNOR), hereby assigns and transfers to <u>CPRM-Serviço Geológico do Brasil</u>, holder of the JGSB, free of charge, on his behalf and on behalf from all co-authors, <u>the right of the first publication.</u> This includes the rights of editing, publication, translation into another language and reproduction by any process, worldwide, today and in the future.&nbsp;</p> <p>After the first publication by the JGSB, <u>authors hold the copyright without restrictions</u> and are allowed to&nbsp;disclose and distribute their work through personal website pages and institutional repositories.</p> <p>At the same time, the ASSIGNOR declares that the content of the manuscript is of sole responsibility of the authors and that this content does not infringe the copyrights and/or other property rights of third parties, that is, that any contents of the manuscript and its attachments, if taken from other publications, are duly referenced and, when necessary, the permissions for publications of such contents were requested by the authors from the copyright holders; that the disclosure of images (if any) has been authorized and that it assumes full moral and/or patrimonial responsibility, due to its content, before third parties.</p> (Evandro Klein) (Support) Fri, 09 Sep 2022 13:22:26 +0000 OJS 60 Petrography, geochemistry and zircon U-Pb geochronology of the Siderian-Rhyacian granitoids of NW Bacajá Domain, Amazonian Craton <p>Archean and Paleoproterozoic granitoids with different geochemical affinities are widely distributed in the basement of high-grade metamorphic rocks of the Bacajá Domain, which consists of Rhyacian granite-greenstone terrain with Archean-Siderian fragments, one of which is in the southeastern Amazonian Craton. Understanding the diversity of these rocks in the geological record is essential to improve the evolution of knowledge of the Amazonian Craton. Thus, this work presents petrographic, geochemical, and geochronological (U-Pb LA-ICP-MS in zircon) data on granitoids of the São José Complex, Canaã Granite, Sant’Ana Granodiorite and Uirapuru Granite, that occur in the northwestern of the Bacajá Domain. São José Complex is composed of biotite tonalites and granodiorites slightly peraluminous from medium to high-K, magnesian and I-type affinities. One U-Pb zircon age was obtained at 2502 ± 6 Ma, which may represent a subduction magmatism in pre-collisional stage arc environment prior to the Transamazonian Orogeny, formed from the melt of Archean crustal sources and amphibolitic rocks. The granitoids like Canaã Granite, Sant’Ana Granodiorite and Uirapuru Granite are composed of weakly metaluminous to peraluminous monzogranites, granodiorites with subordinate tonalites and syenogranites, with high SiO<sub>2</sub> and K<sub>2</sub>O contents and high-K calc-alkaline to shoshonitic affinities, of ferroan I-type and A-type. The age of 2124 ± 7 Ma was obtained for the Sant’Ana Granodiorite, which may indicate its formation in syn- to post-collisional environments related to magmatic episodes of the Transamazonian Orogeny. The granodiorite was crystallized from partial melt of crustal sources derived from intermediate rocks such as tonalites and psammitic gneisses that occur in the region.</p> Cleberson Vieira da Silva, Wagner Silva Amaral, Felipe Holanda dos Santos Copyright (c) 2022 Journal (JGSB) and the authors Fri, 09 Sep 2022 00:00:00 +0000