000165109 001__ 165109
000165109 005__ 20251212165958.0
000165109 0247_ $$2doi$$a10.1016/j.jafrearsci.2025.105915
000165109 0248_ $$2sideral$$a146644
000165109 037__ $$aART-2025-146644
000165109 041__ $$aeng
000165109 100__ $$aHajjar, Zaineb
000165109 245__ $$aAn overview of the Co-Ni-Fe arsenide ore zoning in the Bou Azzer mining district (Central Anti-Atlas, Morocco)
000165109 260__ $$c2025
000165109 5203_ $$aCo-Ni-Fe-bearing arsenide ores in the Bou Azzer district (Anti-Atlas, Morocco) occur alongside serpentinite and are mainly found as contact-type ores or serpentinite-hosted ores. There is a clear zoning pattern in the contact-type ores, evolving from Ni-Co ores and Co-Ni ores filling fault-related open spaces at the serpentinite contact to Fe-Co types within the serpentinite itself. This trend is supported by drill core geochemistry. In serpentinite-hosted orebodies, the arsenide minerals are primarily Fe-Co ores, which preserve cores of Co-Fe ores. Our key contribution is to identify the chemical evolution of the ore-forming fluid. Co and Fe enrichment facilitated the progressive transition from Ni-Co to Co-Fe ores, while subsequent Ni depletion and Fe enrichment generated the disseminated Co-Fe ores (i.e., contact-type ores). Further circulation of these ore-forming fluids through intra-serpentinite weak fault zones tends to precipitate Fe-Co ores surrounding Co-Fe ores (i.e., serpentinite-hosted ores). Critically, we show that the established west-to-east district zoning (decreasing Co, increasing Ni) is specific to contact-type ores and may be influenced by the composition of the adjacent country rock (high Ni content is related to mafic layer in the contact. Serpentinite-hosted ores in the Ait Ahmane area appear to follow this west-east zoning process.
000165109 536__ $$9info:eu-repo/grantAgreement/ES/MCIU/RTI2018-099157-A-I00$$9info:eu-repo/grantAgreement/ES/MINECO/RYC-2015-17596
000165109 540__ $$9info:eu-repo/semantics/closedAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000165109 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000165109 700__ $$0(orcid)0000-0002-0302-2737$$aFanlo, Isabel$$uUniversidad de Zaragoza
000165109 700__ $$aIlmen, Said
000165109 700__ $$aBendaoud, Rachida
000165109 700__ $$aGervilla, Fernando
000165109 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000165109 773__ $$g234 (2025), 105915 [16 pp.]$$pJ. Afr. earth sci.$$tJournal of African Earth Sciences$$x1464-343X
000165109 8564_ $$s9746730$$uhttps://zaguan.unizar.es/record/165109/files/texto_completo.pdf$$yVersión publicada
000165109 8564_ $$s2567114$$uhttps://zaguan.unizar.es/record/165109/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000165109 909CO $$ooai:zaguan.unizar.es:165109$$particulos$$pdriver
000165109 951__ $$a2025-12-12-14:42:51
000165109 980__ $$aARTICLE