Chromite ores formation is still a debated topic and, in this study, detailed analyses ofmajor,minor elements by EMPA and Rare Earth Elements (REE) by SIMS, were performed on silicate inclusions detected in chromite grains of chromitite pods, enveloping dunites and on clinopyroxene of lherzolitic host rock of well known Trodoos chromite ores. Results showthe complexity of relationshipsamong lithologies that reflects the subtlety of genetic events and of chromite ore occurrence. Analyses of textural and chemical features have led to a better understanding of the chromite ore genetic process, that is related to a supra-subduction geodynamic setting where partial melting processes were overlapped by metasomatic events. Metasomatism, that marks the general genetic context, is characterized by the presence of a hydrated boninitic melt that favors the precipitation of chromite ores. Chromite ores, typical of ophiolite complexes and usually enveloped by dunite are, in this case, characterized by the presence of two different types of dunites whose geochemical differences are reflected by olivine mineral chemistry and by different REE patterns of analyzed clinopyroxenes. Such geochemicalmarks, related to different magmatic andmetasomatic events, could be amain key for location of fertile or barren dunites in terms of chromite ore occurrence in the field.

Probe and SIMS investigation of clinopyroxene inclusions in cromite from the Troodos chromitites (Cyprus): implications for dunite-chromitite genesis / A. Merlini, G. Grieco, L. Ottolini, V. Diella. - In: ORE GEOLOGY REVIEWS. - ISSN 0169-1368. - 41:1(2011 Oct), pp. 22-34. [10.1016/j.oregeorev.2011.06.002]

Probe and SIMS investigation of clinopyroxene inclusions in cromite from the Troodos chromitites (Cyprus): implications for dunite-chromitite genesis

A. Merlini
Primo
;
G. Grieco
Secondo
;
2011

Abstract

Chromite ores formation is still a debated topic and, in this study, detailed analyses ofmajor,minor elements by EMPA and Rare Earth Elements (REE) by SIMS, were performed on silicate inclusions detected in chromite grains of chromitite pods, enveloping dunites and on clinopyroxene of lherzolitic host rock of well known Trodoos chromite ores. Results showthe complexity of relationshipsamong lithologies that reflects the subtlety of genetic events and of chromite ore occurrence. Analyses of textural and chemical features have led to a better understanding of the chromite ore genetic process, that is related to a supra-subduction geodynamic setting where partial melting processes were overlapped by metasomatic events. Metasomatism, that marks the general genetic context, is characterized by the presence of a hydrated boninitic melt that favors the precipitation of chromite ores. Chromite ores, typical of ophiolite complexes and usually enveloped by dunite are, in this case, characterized by the presence of two different types of dunites whose geochemical differences are reflected by olivine mineral chemistry and by different REE patterns of analyzed clinopyroxenes. Such geochemicalmarks, related to different magmatic andmetasomatic events, could be amain key for location of fertile or barren dunites in terms of chromite ore occurrence in the field.
Chromite ; REE ; Clinopyroxene ; Troodos ; Ophiolite ; SIMS
Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul
Settore GEO/06 - Mineralogia
Settore GEO/07 - Petrologia e Petrografia
ott-2011
http://www.sciencedirect.com/science/journal/01691368/41&_cHubEid=1-s2.0-S0169136811X00069
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/163494
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