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Data Publication
Quantitative mineralogy, mineral chemistry and microtex-tural data on the UG2 chromitite intruded by iron-rich ul-tramafic pegmatite (IRUP) at the Thaba Mine, northwest-ern Bushveld Complex, South Africa
Zhou, Haoyang | Appelt, Oona | Tjallingii, Rik | Bachmann, Kai | Trumbull, Robert B.
GFZ Data Services
(2023)
Discordant iron-rich ultramafic pegmatites (IRUPs) intersect the UG2 chromitite at many places in the Bushveld Complex but the effects on ore grade and mineralogy have rarely been studied in detail. We investigated a drillcore profile through the UG2 layer affected by IRUP intrusions at Tha-ba mine, NW Bushveld. The work involved quantitative assessment of the ore mineralogy from mineral liberation analysis (MLA), chemical analyses of the main silicate and oxide minerals by elec-tron microprobe (EPMA) and micro-X-ray fluorescence (micro-XRF) element maps of the UG2-IRUP contacts. The data reveal features of UG2-IRUP interaction at different scales. The micro-XRF study of the contacts shows that a thin layer of Fe-Ti-Cr spinel and ilmenite formed on the IRUP side, while chromite on the UG2 side underwent grain coarsening with loss of interstitial space, and developed chemical gradients in Cr, Al, Fe and Ti. On a larger scale, the MLA data document changes in ore and gangue mineral assemblages through most of the meter-thick UG2 layer. This includes formation of secondary hydrous silicates, replacement of PGE- sulfides by PGE alloys and PGE- As-Sb-Bi-Te-Pb phases, and formation of secondary Ni-Cu-Fe sulfides after pentlandite and chalcopyrite.
Keywords
MSL enriched keywords
MSL enriched sub domains i
Source publisher
GFZ Data Services
DOI
10.5880/gfz.3.1.2022.005
Authors
Zhou, Haoyang
0000-0002-0079-503X
Natural History Museum, University of Oslo, Oslo, Norway; GFZ German Research Centre for Geosciences, Potsdam, Germany;
Appelt, Oona
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Tjallingii, Rik
0000-0002-9723-3622
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Bachmann, Kai
Helmholtz-Centre Dresden-Rossendorf, Helmholtz Institute Freiberg of Resource Technology, Freiberg, Germany;
Trumbull, Robert B.
0000-0002-1999-4653
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Contributers
Microprobe Lab (GFZ German Research Centre for Geosciences, Germany)
HostingInstitution
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Laboratory for XRF Element Scanning ((GFZ German Research Centre for Geosciences, Germany)
HostingInstitution
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Trumbull, Robert B.
ContactPerson
GFZ German Research Centre for Geosciences, Potsdam, Germany;
References
Zhou, H., Trumbull, R. B., Veksler, I. V., & Bachmann, K. (2023). The effects of iron-rich ultramafic pegmatite on the composition and mineralogy of the UG2 chromitite: a case study in the western Bushveld Complex, South Africa. Mineralium Deposita, 58(6), 1005–1021. https://doi.org/10.1007/s00126-023-01167-x
10.1007/s00126-023-01167-x
IsSupplementTo
Bachmann, K., Frenzel, M., Krause, J., & Gutzmer, J. (2017). Advanced Identification and Quantification of In-Bearing Minerals by Scanning Electron Microscope-Based Image Analysis. Microscopy and Microanalysis, 23(3), 527–537. https://doi.org/10.1017/s1431927617000460
10.1017/S1431927617000460
Cites
Bachmann, K., Osbahr, I., Tolosana-Delgado, R., Chetty, D., & Gutzmer, J. (2018). Variation in Platinum Group Mineral and Base Metal Sulfide Assemblages in the Lower Group Chromitites of the Western Bushveld Complex, South Africa. The Canadian Mineralogist, 56(5), 723–743. https://doi.org/10.3749/canmin.1700094
10.3749/canmin.1700094
Cites
Fandrich, R., Gu, Y., Burrows, D., & Moeller, K. (2007). Modern SEM-based mineral liberation analysis. International Journal of Mineral Processing, 84(1–4), 310–320. https://doi.org/10.1016/j.minpro.2006.07.018
10.1016/j.minpro.2006.07.018
Cites
Ferracutti, G. R., Gargiulo, M. F., Ganuza, M. L., Bjerg, E. A., & Castro, S. M. (2014). Determination of the spinel group end-members based on electron microprobe analyses. Mineralogy and Petrology, 109(2), 153–160. https://doi.org/10.1007/s00710-014-0363-1
10.1007/s00710-014-0363-1
Cites
Contact
Trumbull, Robert B.
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Citiation
Zhou, H., Appelt, O., Tjallingii, R., Bachmann, K., & Trumbull, R. B. (2023). Quantitative mineralogy, mineral chemistry and microtex-tural data on the UG2 chromitite intruded by iron-rich ul-tramafic pegmatite (IRUP) at the Thaba Mine, northwest-ern Bushveld Complex, South Africa [Data set]. GFZ Data Services. https://doi.org/10.5880/GFZ.3.1.2022.005
Geo location(s)
Thaba Mine, northwestern Bushveld Complex, South Africa