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Grain-scale distribution of molybdenite polytypes versus rhenium contents: μXRD and EBSD data

Published online by Cambridge University Press:  30 July 2019

Olga Y. Plotinskaya Open the ORCID record for Olga Y. Plotinskaya [Opens in a new window] ,
Vladimir V. Shilovskikh Open the ORCID record for Vladimir V. Shilovskikh [Opens in a new window] ,
Jens Najorka ,
Elena V. Kovalchuk ,
Reimar Seltmann Open the ORCID record for Reimar Seltmann [Opens in a new window]  and
John Spratt Open the ORCID record for John Spratt [Opens in a new window]
Olga Y. Plotinskaya*
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry Russian Academy of Sciences (IGEM RAS), Staromonetny per. 35, Moscow 119017, Russia
Vladimir V. Shilovskikh
Affiliation:
Saint Petersburg State University, Ulyanovskaya ul. 1, Saint-Petersburg 198504, Russia
Jens Najorka
Affiliation:
Natural History Museum, London SW7 5BD, UK
Elena V. Kovalchuk
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry Russian Academy of Sciences (IGEM RAS), Staromonetny per. 35, Moscow 119017, Russia
Reimar Seltmann
Affiliation:
Natural History Museum, London SW7 5BD, UK
John Spratt
Affiliation:
Natural History Museum, London SW7 5BD, UK
*
*Author for correspondence: Olga Y. Plotinskaya, Email: plotin-olga@ya.ru
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Abstract

Molybdenite from two porphyry copper mineralisation sites within the South Urals was studied by electron microprobe (EMPA), micro x-ray diffraction (μXRD) and electron backscattered diffraction (EBSD) methods. Elevated contents of rhenium (0.2 to 0.4, sometimes up to 1.1 wt.%) form linear zones from several to tens of micrometres wide and up to hundreds of micrometres long parallel to the elongation of molybdenite flakes. In most cases Re-rich zones are composed of the rhombohedral (3R) polytype of molybdenite, while the rest of the molybdenite flakes with ca. 0.1 wt.% of Re consist of hexagonal (2H) molybdenite. In rare cases Re-rich zones are confined to grain boundaries of molybdenite-2H. It is shown that both μXRD and EBSD are the most appropriate tools to distinguish different polytypes within a single grain of molybdenite.

Keywords

molybdeniterheniumEMPA3R and 2H polytypesμXRDEBSDporphyry copper depositsUrals
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 5 , October 2019 , pp. 639 - 644
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2019 

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Footnotes

Associate Editor: G. Diego Gatta

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