Laser ablation ICPMS study of trace element chemistry in molybdenite coupled with scanning electron microscopy (SEM) - An important tool for identification of different types of mineralization

0460127 - GLÚ 2017 RIV NL eng J - Journal Article
Pašava, J. - Svojtka, Martin - Veselovský, F. - Ďurišová, Jana - Ackerman, Lukáš - Pour, O. - Drábek, M. - Halodová, P. - Haluzová, Eva
Laser ablation ICPMS study of trace element chemistry in molybdenite coupled with scanning electron microscopy (SEM) - An important tool for identification of different types of mineralization.
Ore Geology Reviews. Roč. 72, č. 1 (2016), s. 874-895. ISSN 0169-1368. E-ISSN 1872-7360
R&D Projects: GA ČR GA13-15390S
Institutional support: RVO:67985831
Keywords : molybdenite * trace-element geochemistry * Laser Ablation Inductively Coupled Mass * spectrometry * scanning electron microscopy * nano- to micro-inclusions * Bohemian Massif * Uzbekistan
Subject RIV: DB - Geology ; Mineralogy
Impact factor: 3.095, year: 2016

Using the example of four different types of associations from the Bohemian Massif (greisen-, gold-, base metal-, and "barren granite"-related) and of one porphyry-Cu-Mo(Au) deposit from Uzbekistan, it is shown that molybdenite from a specific type of mineralization possesses a distinct trace-element geochemical composition, which is locally influenced by the presence of relevant mineral phases occurring in the form of sub-nano-, nano-to micron-scale impurities/inclusions. It is documented that, besides typically lattice-bound elements (Re, and W) and isostructural concentrations of Se and Te (substituting for S), molybdenite can concentrate other metals (e.g., Ag, As, Au, Bi, Cu, Nb, Pb, Zn, Zr) which mostly form inclusions or impurities. The distribution of Re in molybdenite indicates crustal sources for the group of greisen-, base-metal-, and a few of the granite-related deposits, compared to a mixed mantle/crustal source for the Au-related and majority of granite-related deposits. Molybdenite from the Kalmakyr porphyry-Cu-Mo (Au) deposit in Uzbekistan is characterized by the highest mean Re value (236 ppm). Rhenium, Se and W have a homogeneous distribution in molybdenite from this deposit. Only galena and anglesite inclusions were identified visually in molybdenite from this type of deposit, while the presence of most likely sub-nano impurities of Cu, Zn and Ag is indicated by LA-ICPMS time-resolved depth profiles.
Permanent Link: http://hdl.handle.net/11104/0260259