CobaltMaghrebV1, France, Analysis, bibRecord, 000479

Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)

Identifieur interne : 000479 ( France/Analysis ); précédent : 000478; suivant : 000480

Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)

Auteurs : M. Leblanc [France] ; W. Fischer [France]

Source :

Mineralogy and Petrology [ 0930-0708 ] ; 1990-05-01.

RBID : ISTEX:59864FA774B591DBCD9FC3C017A4BB438FCA3FDE

Descripteurs français

Pascal (Inist)
- Altération hydrothermale, Analyse chimique, Arséniure, Carbonate, Cobalt substance, Domaine de l'Anti Atlas, Enrichissement, Lentille, Minéral platine, Ophiolite, Or substance, Origine, Quartz, Répartition élément, Réunion, Serpentinite, Sulfure.
Wicri :
- geographic : Réunion.

English descriptors

KwdEn :
- Anti-Atlas, arsenides, carbonates, chemical composition, cobalt ores, enrichment, gold ores, hydrothermal alteration, lenses, ophiolite, partitioning, platinum minerals, provenance, quartz, serpentinite, sulfides, symposia.

Abstract

Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.

Url:

https://api.istex.fr/document/59864FA774B591DBCD9FC3C017A4BB438FCA3FDE/fulltext/pdf

DOI: 10.1007/BF01162691

Affiliations:

Links to Exploration step

ISTEX:59864FA774B591DBCD9FC3C017A4BB438FCA3FDE

Le document en format XML

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<front><div type="abstract" xml:lang="en">Summary: The cobalt-arsenide ores of Bou Azzer are located along the borders of serpentinite massifs (Upper Proterozoic ophiolite complex) in carbonate-quartz lenses resulting from hydrothermal carbonate alteration of serpentinite. The cobalt ores contain an average gold content of 5–20 ppm; gold is mainly located in skutterudite (120 ppm av.), whereas the Fe-arsenide (loellingite) contains < 1 ppm Au. Similarly the highest PGE contents are found in skutterudite (up to 2 ppm total PGE). All the arsenide ores of Bou Azzer exhibit the same chondrite normalized PGE pattern displaying positive Rh and negative Pt anomalies, and a slight positive slope (Pd/Ir = 1 to 2). This uncommon PGE pattern closely resembles to that of sulphides of komatiites. In serpentinite, the PGE patterns are typical of slightly depleted mantle rocks, and the associated podiform chromitites are within the range of ophiolitic chromitites, except for Pd and Au enrichment. Horizons of sulphide-bearing serpentinites show relatively high contents of noble metals and display PGE patterns which closely resemble those of the Co-arsenide ores, although an order of magnitude lower. These sulphides probably correspond to the remobilization during serpentinization of primary magmatic sulphides. The sulphiderich horizons are a possible source-rock for the noble metals of the Bou Azzer cobaltarsenide ores.</div>
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Serveur d'exploration sur le cobalt au Maghreb

Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)

Gold and platinum group elements in cobaltarsenide ores: Hydrothermal concentration from a serpentinite source-rock (Bou Azzer, Morocco)

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur le cobalt au Maghreb
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