首页|Vanadium mineralization at Los Chihuidos sediment-hosted Cu-V deposit,Neuquén Basin,Argentina:An approach to vanadium ore forming processes

Vanadium mineralization at Los Chihuidos sediment-hosted Cu-V deposit,Neuquén Basin,Argentina:An approach to vanadium ore forming processes

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Vanadium mineralization at Los Chihuidos deposit of the Neuquén Basin is linked to the development of a redox front system related to the inflow of hydrocarbons into the red sandstone of the Huincul Formation.Interaction of hydrocarbons with oxidized red beds and connate water generated redox reac-tions where hematite was dissolved due to iron reduction resulting in the discoloration of the red strata.At the contact between oxidized red sandstone and reduced white sandstone,precipitation of specific mineral phases resulted in the V ore with minor amounts of Cu.With the implementation of the redox interface,abundant V-montmorillonite and V-hematite precipitated at the more oxidizing conditions and Cu-V-corrensite-type at the more reducing conditions of the redox front.As the redox front advanced with fluids constantly migrating into the reservoir,more reducing conditions were stablished,promoting chloritization and minor illitization with V-Cu incorporation and continuous upgrading of the ore.Main ore mineralogy consists of clay minerals including V-bearing montmorillonite,Cu-V-corrensite-type,V-di-trioctahedral chlorite and Cu-tri-trioctahedral chlorite with minor V-illite-smectite mixed-layer minerals and associated secondary V-hematite.Chloritization over illitization was favored due to high amounts of Fe and Mg in detrital clasts and in connate fluids and by low K availability related to low amounts of detrital K-feldspar.The spatial transition of V and/or Cu bearing clay minerals observed through the mineralized redox front at Los Chihuidos deposit(kaolinite → smectite → illite/smectite →corrensite-type → di-trioctahedral-chlorite → tri-trioctahedral-chlorite)and the related variation of V-Cu concentrations in bulk rock are indicative of increasing pH and decreasing Eh of resident solutions from red to white sandstones during the hypogene mineralization process.Late influx of Cu-rich oxidized basinal brines precipitated main copper ore with Cu-sulfides in the white sandstone up to the contact with the redox front in contact with hydrocarbons.During uplift and exhumation,percolation of meteoric water promoted remobilization of V and Cu and the precipitation of oxidized V-Cu ore.

Clay mineralsV-chloriteRedox frontBleachingHydrocarbons

Ana L.Rainoldi、Daniel Beaufort、Marta B.Franchini、Adolfo Giusiano、Sabine Petit、Patricia Patrier、M.Josefina Pons

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Dpto.de Geología,Universidad Nacional del Sur(UNS),8000 Bahía Blanca,Argentina

Consejo Nacional de Investigaciones Científicasy Técnicas,Centro Patagónico de Estudios Metalogenéticos,Argentina

Université de Poitiers,IC2MP,CNRS-UMR 7285,Hydrasa,F-86022 Poitiers Cedex,France

Universidad Nacional del Comahue,Facultad de Ingeniería,Departamento de Geología y Petróleo,8300 Neuquén,Argentina

Consultant Geologist,8300 Neuquén,Argentina

Universidad Nacional de Río Negro,Instituto de Investigación en Paleobiología y Geología,Río Negro,Argentina

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European Commission through its Erasmus Mundus Internship programFONCyTCONICETCONICETCONICETUniversidad Nacional del ComahueUniversidad Nacional del Sur(SECyT through its Internship program in Research and PG I 24/H144)European Union(ERDF)Région Nouvelle Aquitaine

PICT 2010-2608PIP 6043PIP 1083PIP 330PIP 04/I167

2024

10.1016/j.gsf.2023.101724

地学前缘(英文版)
中国地质大学（北京） 北京大学

地学前缘(英文版)

CSTPCD
影响因子：0.576
ISSN：1674-9871
年,卷(期)：2024.15(1)
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