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      Chromite chemistry of a massive chromitite seam in the northern limb of the Bushveld Igneous Complex, South Africa: correlation with the UG-2 in the eastern and western limbs and evidence of variable assimilation of footwall rocks

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          Abstract

          The Bushveld Igneous Complex (BIC) is known for its laterally extensive platinum group element–bearing layers, the most famous being the Merensky Reef and the UG-2 chromitite in the eastern and western limbs of the complex. In the northern limb, the Platreef mineralization and a thick chromitite seam below it (referred to as the “UG-2 equivalent” or UG-2E) have been proposed to be the stratigraphic equivalents of the Merensky Reef and the UG-2, respectively. In this study, we compare a suite of UG-2E samples from the Turfspruit project with a UG-2 reference suite from the western limb using petrography, electron probe microanalysis, laser ablation-inductively coupled plasma-mass spectrometry, and Mössbauer spectroscopy. The results show that (a) in Mg# vs. Cr# diagrams, UG-2E chromites have a distinct compositional field; however, when samples of similar chromite modal abundance (≥ 80%) are used, the UG-2E chromites overlap the field that characterizes UG-2 chromites; (b) the UG-2E is more variable in chromite modal abundance than the UG-2; and (c) variations in Mg# and Fe 3+/ΣFe in the UG-2E indicate contamination of the magma by metasedimentary rocks of the Duitschland Formation (Transvaal Supergroup) during emplacement, followed by partial re-equilibration of chromite grains with a trapped melt. Thus, we conclude that for chromite modes higher than 80%, the chromite composition retains enough information to allow correlation and that the UG-2E in the northern limb is very likely the UG-2 chromitite.

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          Chromian spinel as a petrogenetic indicator in abyssal and alpine-type peridotites and spatially associated lavas

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            A General Equation for Estimating Fe3+ Concentrations in Ferromagnesian Silicates and Oxides from Microprobe Analyses, Using Stoichiometric Criteria

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              CHROMIAN SPINEL AS A PETROGENETIC INDICATOR: PART 1. THEORY

              T. Irvine (1965)
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                Author and article information

                Contributors
                mlanga@laurentian.ca
                Journal
                Miner Depos
                Miner Depos
                Mineralium Deposita
                Springer Berlin Heidelberg (Berlin/Heidelberg )
                0026-4598
                1432-1866
                3 March 2020
                3 March 2020
                2021
                : 56
                : 1
                : 31-44
                Affiliations
                [1 ]GRID grid.258970.1, ISNI 0000 0004 0469 5874, Mineral Exploration Research Centre, Harquail School of Earth Sciences, , Laurentian University, ; Sudbury, Canada
                [2 ]GRID grid.410356.5, ISNI 0000 0004 1936 8331, Department of Geological Sciences and Geological Engineering, , Queen’s University, ; Kingston, Ontario Canada
                [3 ]GRID grid.410356.5, ISNI 0000 0004 1936 8331, McDonald Institute, , Queen’s University, ; Kingston, Ontario Canada
                [4 ]Ivanplats (Pty) Ltd., Mokopane, South Africa
                [5 ]GRID grid.57686.3a, ISNI 0000 0001 2232 4004, Department of Natural Sciences, College of Life and Natural Sciences, , University of Derby, ; Derby, UK
                [6 ]GRID grid.425591.e, ISNI 0000 0004 0605 2864, Swedish Museum of Natural History, Department of Geosciences, ; Stockholm, Sweden
                Author notes

                Editorial handling: W. D. Maier

                Author information
                http://orcid.org/0000-0002-2086-0564
                Article
                964
                10.1007/s00126-020-00964-y
                7831339
                356de8b3-79b6-477c-a0b0-5a1ee598cea0
                © The Author(s) 2020

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

                History
                : 13 April 2019
                : 17 February 2020
                Funding
                Funded by: FundRef http://dx.doi.org/10.13039/501100000038, Natural Sciences and Engineering Research Council of Canada;
                Award ID: crdpj514753-17
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                Custom metadata
                © Springer-Verlag GmbH Germany, part of Springer Nature 2021

                bushveld,chromite,platreef,ug-2,trapped liquid shift effect
                bushveld, chromite, platreef, ug-2, trapped liquid shift effect

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