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Microstructural Control on Trace Element Diffusion in Pyrrhotite from Komatiite Hosted Massive Ni Sulphides, Yilgarn Craton

Vukmanovic Zoja, Reddy Steven M., Godel Bélinda, Barnes Stephen J., Fiorentini Marco L. et Barnes Sarah-Jane. (2013). Microstructural Control on Trace Element Diffusion in Pyrrhotite from Komatiite Hosted Massive Ni Sulphides, Yilgarn Craton. Mineralogical Magazine, 77, (5), p. 2434.

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URL officielle: http://dx.doi.org/10.1180/minmag.2013.077.5.22

Résumé

Pyrrhotites (Fe (sub 7) S (sub 8) ) from three different komatiite hosted massive nickel sulphide deposits have been analysed with electron backscatter diffraction analysis (EBSD) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) in order to understand how trace elements behave during deformation. EBSD data reveals strain localisation microstructures in sample from greenschist facies whereas in sample from mid-amphibolite facies, pyrrhotite contains multiple parallel low angle boundaries and crystallographic preferred orientation. A sample from the upper amphibolite facies, is characterised by very large >2cm grains that contains numerous deformation twins. Laser ablation ICP-MS data reveal increased concentrations of Pb, Bi and Ag along low angle subgrain boundaries and twin boundaries. The increased concentrations of Pb, Bi and Ag are explained by diffusion of the trace elements along fast diffusion pathways (low angle and twin boundaries). Trace element variations are developed at the low-temperature stage of the tectonic history of the three deposits. Diffusion of Pb, Bi and Ag is triggered by their low solubility in sulphide phase, pyrrhotite.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0026-461X 1471-8022
Volume:77
Numéro:5
Pages:p. 2434
Version évaluée par les pairs:Oui
Date:2013
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:amphibolite facies, Australasia, Australia, crystal chemistry, crystal growth, deformation, diffusion, facies, host rocks, ICP mass spectra, igneous rocks, komatiite, mass spectra, massive deposits, metal ores, metamorphic rocks, nickel ores, preferred orientation, pyrrhotite, solubility, spectra, structural analysis, structural controls, sulfides, trace elements, twinning, volcanic rocks, Western Australia, Yilgarn Craton
Déposé le:09 juin 2016 15:06
Dernière modification:09 déc. 2016 16:13
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