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Data Publication
Mineral chemistry of chromite, orthopyroxene and plagioclase of chromitite layers in the Lower and Middle Group of the northwestern Bushveld Complex
Kaufmann, Felix E.D. | Hoffmann, Marie C. | Bachmann, Kai | Veksler, Ilya V. | Trumbull, Robert B. | Hecht, Lutz
GFZ Data Services
(2019)
This data set contains mineral chemical analyses of chromite, orthopyroxene and plagioclase of five chromitite layers and their immediate host rocks from drill core ZK135 of the northwestern Bushveld Complex. The sampled interval of ZK135 covers the transition of the Lower and Middle Group chromitites (LG6, LG6a, MG1, MG2, MG2 II). Detailed geochemical profiles are presented by data sheets and graphically to reveal small-scale variations in mineral chemistry. Mineral chemical analyses were conducted on drill core material from borehole ZK135 from the Thaba mine, operated by Cronimet Chrome Mining SA (Pty) Ltd. Briefly, each layer is hosted in pyroxenite and comprises a main chromitite layer and in some chromitites additional stringers above or below the main layer. Chromitites are composed of chromite, which are cemented by intercumulus plagioclase and orthopyroxene oikocrysts. A detailed study of the orthopyroxene oikocrysts in MG1 was published by Kaufmann et al. (2018). Additionally, euhedral to subhedral cumulus orthopyroxene is present in the LG6a, MG1 and MG2 layers. Pyroxenitic partings, small layers of pyroxenite within the chromitite, occur throughout the LG6 to MG2 layers. The main mineral phases chromite, orthopyroxene and plagioclase were analyzed by electron microprobe in each layer and the adjacent pyroxenitic host rocks. Major-element compositions of chromite, orthopyroxene and plagioclase were analyzed by electron microprobe at the Museum für Naturkunde Berlin with a JEOL JXA-8500F EMP equipped with a field emission cathode and five wavelength-dispersive spectrometers. For more information please consult the data description file and Kaufmann et al. (2019) to which these data are supplementary material.
Keywords
Originally assigned keywords
MSL enriched keywords
MSL enriched sub domains i
Source publisher
GFZ Data Services
DOI
10.5880/fidgeo.2018.026
Authors
Kaufmann, Felix E.D.
0000-0002-4579-3599
Museum für Naturkunde Berlin, Leibnitz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, Germany;
Hoffmann, Marie C.
BAM Federal Institute of Materials Research and Testing, Berlin, Germany;
Bachmann, Kai
Helmholtz-Zentrum Dresden-Rossendorf, Germany; Helmholtz Institute Freiberg of Resource Technology;
Veksler, Ilya V.
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Trumbull, Robert B.
0000-0002-1999-4653
GFZ German Research Centre for Geosciences, Potsdam, Germany;
Hecht, Lutz
0000-0001-8904-0217
Museum für Naturkunde Berlin, Leibnitz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, Germany;
Contributers
Kaufmann, Felix E.D.
ContactPerson
0000-0002-4579-3599
Museum für Naturkunde Berlin, Leibnitz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, Germany;
References
Kaufmann, F. E. D., Hoffmann, M. C., Bachmann, K., Veksler, I. V., Trumbull, R. B., & Hecht, L. (2019). Variations in Composition, Texture, and Platinum Group Element Mineralization in the Lower Group and Middle Group Chromitites of the Northwestern Bushveld Complex, South Africa. Economic Geology, 114(3), 569–590. https://doi.org/10.5382/econgeo.4641
10.5382/econgeo.4641
IsSupplementTo
Droop, G. T. R. (1987). A general equation for estimating Fe3+ concentrations in ferromagnesian silicates and oxides from microprobe analyses, using stoichiometric criteria. Mineralogical Magazine, 51(361), 431–435. https://doi.org/10.1180/minmag.1987.051.361.10
10.1180/minmag.1987.051.361.10
Cites
JAROSEWICH, E., NELEN, J. A., & NORBERG, J. A. (1980). Reference Samples for Electron Microprobe Analysis*. Geostandards Newsletter, 4(1), 43–47. Portico. https://doi.org/10.1111/j.1751-908x.1980.tb00273.x
10.1111/j.1751-908X.1980.tb00273.x
Cites
Kaufmann, F. E. D., Vukmanovic, Z., Holness, M. B., & Hecht, L. (2018). Orthopyroxene oikocrysts in the MG1 chromitite layer of the Bushveld Complex: implications for cumulate formation and recrystallisation. Contributions to Mineralogy and Petrology, 173(2). https://doi.org/10.1007/s00410-018-1441-x
10.1007/s00410-018-1441-x
Cites
Contact
Kaufmann, Felix E.D.
Museum für Naturkunde Berlin, Leibnitz-Institut für Evolutions- und Biodiversitätsforschung, Berlin, Germany;
Citiation
Kaufmann, F. E. D., Hoffmann, M. C., Bachmann, K., Veksler, I. V., Trumbull, R. B., & Hecht, L. (2019). Mineral chemistry of chromite, orthopyroxene and plagioclase of chromitite layers in the Lower and Middle Group of the northwestern Bushveld Complex [Data set]. GFZ Data Services. https://doi.org/10.5880/FIDGEO.2018.026
Geo location(s)
Bushveld Complex, South Africa