  Citation: Dressel, B.C.; Chauvet, A.; Kouzmanov, K.; Trzaskos, B.; Bruguier, O.; Monié, P.; Villanova, S.N.; Newton, J.B. The Passa Três Granite Intrusion-Related/Hosted Neoproterozoic Gold Deposit (Paraná State, Brazil): Mineralogical, Geochemical, Fluid Inclusion and Sulphur Isotope Constraints. Minerals 2022, 12, 407. https:// doi.org/10.3390/min12040407 Academic Editor: Galina Palyanova Received: 15 February 2022 Accepted: 20 March 2022 Published: 25 March 2022 Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affil- iations. Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). minerals Article The Passa Três Granite Intrusion-Related/Hosted Neoproterozoic Gold Deposit (Paraná State, Brazil): Mineralogical, Geochemical, Fluid Inclusion and Sulphur Isotope Constraints Bárbara Carolina Dressel 1,2,3 , Alain Chauvet 1, * , Kalin Kouzmanov 4 , Barbara Trzaskos 2 , Olivier Bruguier 1 , Patrick Monié 1 , Sandro Notto Villanova 5 and José Bazille Newton 5 1 Géosciences Montpellier, Université de Montpellier, CNRS, 34095 Montpellier, France; barbara.c.dressel@gmail.com (B.C.D.); olivier.bruguier@umontpellier.fr (O.B.); patrick.monie@umontpellier.fr (P.M.) 2 Post-Graduation Program in Geology, Geology Department, Federal University of Paraná, Av. Coronel Francisco Heráclito dos Santos, 210, Curitiba 81531-970, PR, Brazil; barbaratrzaskos@ufpr.br 3 Capes-PDSE Scholarship Process n. 99999.006489/2015-00, CAPES Foundation, Ministry of Education of Brazil, Brasília 70040-020, DF, Brazil 4 Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, 1205 Geneva, Switzerland; kalin.kouzmanov@unige.ch 5 Mineração Tabiporã, Rua Maria Aparecida de Oliveira, 803-Lt. São Gerônimo, Campo Largo 83606-177, PR, Brazil; sn.villanova@gmail.com (S.N.V.); josebazille@hotmail.com (J.B.N.) * Correspondence: alain.chauvet1@umontpellier.fr Abstract: The Passa Três granite is a 5 km 2 intrusion in southern Brazil with an NNE–SSW-elongated shape, hosting gold-bearing quartz veins with fluorite, carbonates, sulphides (pyrite, chalcopyrite, aikinite, molybdenite) and native gold. Orebodies are hosted by the pluton roof zone, which is marked by various textures indicating magmatic–hydrothermal transition processes. Mineralisation formed between 613 and 608 Ma in extensional pull-apart structures controlled by two conjugated N–S and E–W fault systems. We report results from petrography, quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), scanning electron microscopy (SEM), electron probe microanalyses (EPMA), X-ray fluorescence (XRF), trace element analyses of pyrite by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS), sulphur isotope (δ 34 S) analyses, and fluid inclusion microthermometry. Hydrothermal alteration is dominantly developed as phengite– quartz–carbonate and sericite–carbonate–chlorite assemblages along mineralised structures. Fluid inclusion study indicates mineralising fluids with H 2 O-CO 2 -NaCl composition, low to moderate salinity (0.2–12.84 wt % NaCl eq.), and temperatures from 400 to 150 ◦ C. The sulphur isotopic composition of pyrite (−0.1 to 1.1‰) suggests magmatic origin. These data, in conjunction with structurally controlled mineralisation enriched in Au-Bi minerals shortly post-dating the granite emplacement, appoint towards similarities between the Passa Três deposit and intrusion-related gold systems. The specific location of the mineralisation in the core (and in the roof zone, regarding its vertical position) of the Passa Três granitic intrusion defines it as “granite-hosted” thus, it is representative of a specific model that can be used for exploration of other intrusion-related/hosted gold deposits near the studied area or in other locations. Keywords: magmatic–hydrothermal; gold-bearing quartz vein; intrusion-related gold deposit; granite-hosted gold deposit; Passa Três granite; Brazil; Neoproterozoic 1. Introduction Intrusion-related gold deposits (IRGD) have been defined as a type of mineralisa- tion in which gold frequently occurs in a distal or proximal position with respect to the Minerals 2022, 12, 407. https://doi.org/10.3390/min12040407 https://www.mdpi.com/journal/minerals