The systematics of Co, Ni, and Cu contents in pyrrhotite from the upper zone of the western Bushveld Complex, South Africa

Merkle, R. K. W.

doi:10.2113/gssajg.111.2-3.187

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Owing to the economic Ni-Co-Cu potential linked to magmatic mafic-ultramafic rocks (e.g. Bushveld [21]; Kabanga in Tanzania [8]; Hongqiling in China [38]), the study of these sulphides is very attractive as they can be a window towards valuable indices. This article: presents a summary of petrogeochemical data; provides textural and mineralogical data on sulphides; discusses their magmatic segregation and subsequent subsolidus re-equilibration.…”

Section: Introductionmentioning

confidence: 99%

Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon

Nkoumbou¹,

Villièras²,

Barbey³

et al. 2009

Comptes Rendus. Géoscience

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The amphibole metapyroxenite intrusion from Mamb (Cameroon) consists of enstatite, diopside-augite, edenite, and traces of plagioclase, biotite and rutile. It contains notable amounts of sulphides (pyrrhotite, pentlandite, chalcopyrite, pyrite and Co-rich violarite). The sulphide phase segregated during magma crystallization as immiscible droplets ( 1 mm) included in growing ferromagnesian minerals or aggregated in the silicate crystal mush to form an interstitial phase. However, observed sulphide assemblages are likely to result from low-T ( 300 8C) re-equilibration of high-T monosulphide solid solutions, more particularly during the Pan-African metamorphic event. The Mamb amphibole pyroxenite intrusion is tentatively considered as a potential source for Ni and Co mineralization.

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Section: Introductionmentioning

confidence: 99%

Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon

Nkoumbou¹,

Villièras²,

Barbey³

et al. 2009

Comptes Rendus. Géoscience

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Primary stratigraphic controls on ore mineral assemblages in the Wannaway komatiite-hosted nickel-sulfide deposit, Kambalda camp, Western Australia

Moroni

Caruso

Barnes

et al. 2017

Ore Geology Reviews

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Genesis of Metal Sulfides and Its Significance on Graphite Mineralization in the Huangyangshan Graphite Deposit, East Junggar, Xinjiang Province, China

Ren

Sun

et al. 2022

Minerals

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The Huangyangshan super-large graphite deposit is located in the Qitai area of East Junggar in Xinjiang Province, China. This deposit is well known for its distinguishing properties, including the alkaline granite complex that hosts the graphite ore, the dominantly orbicular structure developed in the graphite ore, and the association of graphite with metal sulfides in the orbicular ore. This study aims to determine the genetic relationship between graphite and metal sulfides in order to better understand the graphite mineralization process of the Huangyangshan deposit. The methods applied in the study include X-ray micro-CT scanning and scanning electron microscopy (SEM) analyses of the orbicular graphite ore and in situ inductive laser ablation-coupled plasma mass spectrometry (LA-ICP-MS) trace element analyses of the pyrrhotite and chalcopyrite associated with the graphite. The analytical results show that the graphite ore is composed of crystalline graphite, K-feldspar, albite, quartz, biotite, amphibole, and metal sulfides. The metal sulfides in the orbicular ore include pyrite, pyrrhotite, pentlandite, and chalcopyrite. According to the color, crystalline shape, texture, and occurrence, pyrrhotite can be classified into four types (I, II, III, and IV), and chalcopyrite into two types (I and II), of which types I, II, and III pyrrhotite and type I chalcopyrite have a close genetic relationship with graphite. The granular types (I, II, and III) of pyrrhotite are enriched in Co, Ni, Se, Ge, and Te and are depleted in As, Sb, Ag, and Au; they also have a high value of Co/Ni, indicating that these types of pyrrhotite have a magmatic origin. Low values of Co/Ni suggest that type IV pyrrhotite has a hydrothermal origin. The similar contents of Co and Ni and the values of Co/Ni compared with the chalcopyrite from the magmatic Co–Ni sulfide deposits imply that type I chalcopyrite has a magmatic origin. In summary, the metal sulfides of the Huangyangshan deposit are genetically related to graphite mineralization and formed predominantly by magmatic processes.

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The systematics of Co, Ni, and Cu contents in pyrrhotite from the upper zone of the western Bushveld Complex, South Africa

Cited by 3 publications

References 24 publications

Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon

Ni-Co sulphide segregation in the Mamb pyroxenite intrusion, Cameroon

Primary stratigraphic controls on ore mineral assemblages in the Wannaway komatiite-hosted nickel-sulfide deposit, Kambalda camp, Western Australia

Genesis of Metal Sulfides and Its Significance on Graphite Mineralization in the Huangyangshan Graphite Deposit, East Junggar, Xinjiang Province, China

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