High-Cr and high-Al chromitites from the Sagua de Tánamo district, Mayarí-Cristal ophiolitic massif (eastern Cuba): Constraints on their origin from mineralogy and geochemistry of chromian spinel and platinum-group elements

Gonzáléz-Jiménez, José María; Proenza, Joaquín A.; Gervilla, Fernando; Melgarejo, Joan Carles; Blanco-Moreno, Jesús A.; Ruiz-Sánchez, R.; Griffin, William L.

doi:10.1016/j.lithos.2011.01.016

Cited by 167 publications

(73 citation statements)

References 91 publications

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“…Moreover, platinum-group minerals (PGM) commonly nucleate on spinel surfaces, further increasing the bulk capacity for Cr-spinel-rich rocks to host Ru and the other IPGE including Ir which forms surficial micro-nuggets (Locmelis et al, 2011). In practice, it is difficult to distinguish between mantle retention of IPGE by Cr-spinel and very early Cr-spinel fractionation, but chromitites and dunites, which contain Cr-spinel and associated PGM are known to form in sub-arc ophiolitic mantle as a result of depletion and melt-peridotite interaction (Garuti et al, 1999;Gonzalez-Jimenez et al, 2011). These rocks are enriched in IPGE over PPGE, a signature that is broadly equivalent to the modelled mantle residue after the 2 nd stage of melting ( Figure 13).…”

Section: Sulphidesmentioning

confidence: 99%

“…In addition, laurite (and PGM in general) is more refractory than base-metal sulphide (Brenan and Andrews, 2001;Bockrath et al, 2004b) and hence is more likely to be retained during melting. Laurite-rich PGM assemblages have been observed directly in highly depleted harzburgites and lherzolites (re-fertilised harzburgites) of the Lherz massif (Luguet et al, 2007;Lorand et al, 2010), and in Cr-spinel rich rocks from ophiolites (Garuti et al, 1999;Gonzalez-Jimenez et al, 2011).…”

Section: Platinum-group Minerals (Pgm)mentioning

confidence: 99%

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Inter-element fractionation of highly siderophile elements in the Tonga Arc due to flux melting of a depleted source

Dale

Macpherson

Pearson

et al. 2012

Geochimica et Cosmochimica Acta

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. (2012) 'Inter-element fractionation of highly siderophile elements in the Tonga Arc due to ux melting of a depleted source. ', Geochimica et Cosmochimica Acta., Further information on publisher's website:http://dx.doi.org/10.1016/j.gca.2012.03.025Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Geochimica et Cosmochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Geochimica et Cosmochimica Acta, 89, 2012Acta, 89, , 10.1016Acta, 89, /j.gca.2012 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. with a high fluid flux is thought to have produced boninitic magmas at several arc and FSC locations.As such, this arc system provides an opportunity to assess the fluid mobility of HSEs and to investigate the effects of fluid-induced melting and prior melt depletion on HSE behaviour during both mantle melting and magma evolution.

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Section: Sulphidesmentioning

confidence: 99%

Section: Platinum-group Minerals (Pgm)mentioning

confidence: 99%

Inter-element fractionation of highly siderophile elements in the Tonga Arc due to flux melting of a depleted source

Dale

Macpherson

Pearson

et al. 2012

Geochimica et Cosmochimica Acta

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“…In general, the parental magmas of Cr-and PGE-rich chromitites are derived from the mantle, as crustal rocks tend to be poor in Cr and PGE (Taylor and McLennan, 1985;Becker et al, 2006). The compositional diversity of chromitites in terms of their Cr and PGE contents is a common feature of many ophiolite complexes, where it can be occurred in separate massifs (Graham et al, 1996;Ahmed et al, 2001;Ahmed, 2007;Uysal et al, 2009;González-Jiménez et al, 2011), or sometimes coexistence within a single ultramafic massif of an ophiolite (Proenza et al, 1999;Ahmed and Arai, 2002). The bimodal geochemical characteristics of chromitites in terms of their Cr# of chromian spinels are most probably attributable to the differences in magma composition and/or degrees of partial melting.…”

Section: Compositional Variationsmentioning

confidence: 99%

Compositional variations and tectonic settings of podiform chromitites and associated ultramafic rocks of the Neoproterozoic ophiolite at Wadi Al Hwanet, northwestern Saudi Arabia

Ahmed

Harbi

Habtoor

2012

Journal of Asian Earth Sciences

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“…They assume that high-Al spinels are formed beneath MOR, whereas high-Cr spinels appear in the supra-subduction zone (SSZ) condition. If the same peridotite block shows chrome ores of different spinel chemistry, they assume that it was repeatedly impregnated by melts in MOR-conditions earlier (producing high-Al spinel ore) and in SSZconditions later (producing high-Cr spinel ore) (Gonzalez-Jimenez et al, 2011;. If both high-Cr spinel ore and high-Al spinel are separated in the massif volume, they infer that these blocks were formed in a different setting and came into contact tectonically .…”

Section: Fig 6 Framework Of Tiny Dunite Veinlet From Peridotite (Oumentioning

confidence: 99%

Compositional Variation of Chrome Spinels in the Ore-bearing Zones of the Kraka Ophiolite and the Chromitite Origin

Saveliev¹,

Blinov²

2017

ВПУГ

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The article considers a chemical variation of accessory and ore-forming chrome spinels from the Kraka ultramafic massif at the different scales, from the deposit to the thin section. A correlation analysis of compositional and structural features of ultramafic rocks and ores was performed. The ultramafic rocks and chromitites in the studied massif show the distinct deformation structures and tectonite olivine fabric. A typical chemical gap (i.e. Cr#=Cr/(Cr+Al)) was observed between peridotite, on the one hand, and dunite and chromitite, on the other hand, on the scale of deposits and ore-bearing zones. The location and size of this gap depend on the type of deposit. The gap becomes wider from the disseminated tabular bodies to the typical podiform ones. It has been found that in the thin initial dunite veinlets in peridotite the chrome spinels chemistry changes gradually and there is no Cr# gap between peridotite and dunite. The dunite venlets show a strong olivine fabric, which is an evidence of their high-temperature plastic flow origin. It has been revealed that new chrome spinel grains previously formed as rods or needles and then coarsened. We explained this observation as the result of impurity segregation, coalescence and spheroidization induced by the plastic deformation of olivine. It is inferred that a solid crystal flow is the main requirement for the dunite and chromitite body formation in the Kraka ophiolite massif. In the solid stream, the mineral phase separation takes place. For example, olivine and orthopyroxene grains of parental peridotite separate from one another, and weaker (more mobile) olivine grains form dunite bodies in which chromitite appears as a result of impurity segregation.

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High-Cr and high-Al chromitites from the Sagua de Tánamo district, Mayarí-Cristal ophiolitic massif (eastern Cuba): Constraints on their origin from mineralogy and geochemistry of chromian spinel and platinum-group elements

Cited by 167 publications

References 91 publications

Inter-element fractionation of highly siderophile elements in the Tonga Arc due to flux melting of a depleted source

Inter-element fractionation of highly siderophile elements in the Tonga Arc due to flux melting of a depleted source

Compositional variations and tectonic settings of podiform chromitites and associated ultramafic rocks of the Neoproterozoic ophiolite at Wadi Al Hwanet, northwestern Saudi Arabia

Compositional Variation of Chrome Spinels in the Ore-bearing Zones of the Kraka Ophiolite and the Chromitite Origin

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