Platinum group element proportions in chromitites of the Bushveld complex: implications for fractionation and magma mixing models

Gruenewaldt, G. von; Merkle, R. K. W.

doi:10.1016/0899-5362(95)00110-7

Cited by 30 publications

(13 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Augé, 1985;Garuti et al, 1999;El Ghorfi et al, 2008;González-Jiménez et al, 2009;Marchesi et al, 2010) and layered intrusions (e.g. Merkle, 1992;Von Gruenewaldt and Merkle, 1995;. Chromite-rich rocks in these settings are characteristically enriched in Ru, Ir and Os, which in most cases appear to be hosted in accessory phases such as laurite, arsenides, and alloys.…”

Section: Introductionmentioning

confidence: 97%

Ruthenium in komatiitic chromite

Locmelis

Pearson

Barnes

et al. 2011

Geochimica et Cosmochimica Acta

105

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 97%

Ruthenium in komatiitic chromite

Locmelis

Pearson

Barnes

et al. 2011

Geochimica et Cosmochimica Acta

105

View full text Add to dashboard Cite

“…The chondrite normalized PGE patterns (Fig. 7) are similar to chromitites with very low sulphide contents such as those from ophiolite complexes and from the lower layers of the Critical Zone (LG-1) of the Bushveld layered complex (Von Gruenewaldt & Merkle 1995). The studied chromitites bear no similarity with chromitites with sulphide inclusions, as the UG-2 chromitites from the Bushveld complex.…”

Section: Figure 3 -Mafic Dykes Intrusive Into Serpentinites Santa Lumentioning

confidence: 70%

“…(Bushveld UG2 and LG1,open square). Data after Mathez & Peach (1989) and Von Gruenewaldt & Merkle (1995). Chondrite abundances after Naldrett & Duke (1980).…”

Section: Geochemistry Of the Mafic Rocksmentioning

confidence: 99%

The Santa Luz chromite-peridotite and associated mafic dykes, Bahia-Brazil: remnants of a transitional-type ophiolite related to the Paleoproterozoic (>2.1 Ga) Rio Itapicuru greenstone belt?

Oliveira

Escayola

Souza

et al. 2007

RBG

View full text Add to dashboard Cite

The Santa Luz chromite-rich peridotite complex crops out in the Serrinha Block (NE São Francisco craton), approximately between grey gneisses of the Archaean basement and supracrustal rocks of the Palaeoproterozoic Rio Itapicuru greenstone belt. It comprises serpentinite, serpentinised harzburgite, massive chromitites, gabbroic pockets and amphibolite dykes/veins with epidote-rich margins, all intruded by pegmatite and aplite dykes. The mafic-ultramafic rock association is interpreted as basaltic melt percolation through mantle peridotites. Massive chromitites show major element chemistry and platinum group elements signature similar to ophiolite chromitites. The complex is older than 2085 ± 12 Ma and younger than 2983 ± 8 Ma based on U-Pb ages obtained respectively on aplite dyke and host banded gneiss. The Santa Luz peridotite complex and associated mafic dykes may be related to rifting of a magma-poor continental margin that later evolved into an ocean, the closing of which eventually formed the Palaeoproterozoic Rio Itapicuru greenstone belt.Keywords: transitional ophiolite, melt impregnation, magma-poor rifted continental margin, palaeoproterozoic greenstone belt, São Francisco craton. Resumo O peridotito cromitífero de Santa Luz e diques máficos associados, Bahia-Brasil: remanescentes de um ofiolito transicional relacionado ao greenstone belt paleoproterozóico (>2.1Ga) do rio Itapicuru? O complexo peridotítico de Santa Luz ocorre no Bloco Serrinha (NE do Cráton do SãoFrancisco), aproximadamente entre gnaisses do embasamento arqueano e rochas supracrustais do greenstone belt do Rio Itapicuru. Ele contém serpentinitos, harzburgitos serpentinizados, cromititos maciços, faixas gabróicas e diques/veios de anfibolitos. Todo o conjunto é cortado por pegmatitos e aplitos. A associação máfica e ultramáfica é interpretada como percolação de magma basáltico em peridotitos do manto. Os cromititos maciços apresentam química mineral e padrões de elementos do grupo da platina semelhantes aos de cromititos de ofiolitos. O complexo é mais antigo que 2085 ± 12 Ma e mais novo que 2983 ± 8 Ma, idades obtidas respectivamente em dique aplítico e gnaisse bandado encaixante. O complexo peridotítico de Santa Luz e os diques máficos associados podem ser relacionados à fase rifte de uma margem continental pobre em magma, a qual evoluiu para a abertura de um oceano e posteriormente se fechou para finalmente formar o greenstone belt do Rio Itapicuru durante colisão continental no Paleoproterozóico.Palavras-chave: ofiolito transicional, rifte de margem continental pobre em magma, greenstone belt paleoproterozóico, Cráton do São Francisco.

show abstract

“…The high correlation coefficient between Rh and Ir is also noteworthy in the chromitite layers (Von Gruenewaldt and Merkle, 1995 ). A possible reason for the high correlation between Rh and Ir is that a limited amount of Rh can be contained in the (i) Data from the work of Geological Team 402, Sichuan Bureau of Geology and Mineral Resources, 'Detailed exploration report of the Zhengziyanwo section, Yangliuping Pt-Ni deposit, Danba, Sichuan ', 1982. solid solution in the chromite lattice.…”

Section: Enrichment Of Rhmentioning

confidence: 92%

“…This was confirmed by Copobianco and Drake (1990), who concluded, on the basis of experimental investigations, that Rh is highly compatible into spinel. Based on this, Von Gruenewaldt and Merkle (1995) explained the enrichment of Rh in the chromitite layers. This shows that during the fractionation process of S-poor magma, Rh could participate into the spinel facies in the early stage of magma evolution, and thus cause the differentiation of Rh from Pt and Pd.…”

Section: Enrichment Of Rhmentioning

confidence: 97%

Platinum-group elements geochemistry of the yangliuping magmatic Ni-Cu-PGE sulfide deposit: Implications of its genetic link with the extrusive basalts

Jian

Cao

Song

et al. 2004

J Ocean Univ. China

View full text Add to dashboard Cite

Primitive mantle-normalized Platinum-group elements (PGE) concentration patterns for the Zhengziyanwo intrusion and Dashibao Formation basalts are of positive slope, similar to most of the world-class magmatic Ni-Cu-PGE sulfide deposits. Characters of this intrusion and its related ores and Dashibao Formation basalts are their negative Pt-anomaly and high concentration of Rh relative to Pt and Pd, facts being interpreted to be the results of crystallization and fractionation of Pt-alloys and spinel phase-free crystallization history for the magma, respectively. PGE parameters of the Dashibao Formation basalts are consistent with the general trend of those found for the Zhengziyanwo intrusion, and this might infer a genetic link between them.

show abstract

Platinum group element proportions in chromitites of the Bushveld complex: implications for fractionation and magma mixing models

Cited by 30 publications

References 40 publications

Ruthenium in komatiitic chromite

Ruthenium in komatiitic chromite

The Santa Luz chromite-peridotite and associated mafic dykes, Bahia-Brazil: remnants of a transitional-type ophiolite related to the Paleoproterozoic (>2.1 Ga) Rio Itapicuru greenstone belt?

Platinum-group elements geochemistry of the yangliuping magmatic Ni-Cu-PGE sulfide deposit: Implications of its genetic link with the extrusive basalts

Contact Info

Product

Resources

About