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

Cite as:

Zhou, Haoyang; Appelt, Oona; Tjallingii, Rik; Bachmann, Kai; Trumbull, Robert 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. GFZ Data Services. https://doi.org/10.5880/GFZ.3.1.2022.005

Status

I N R E V I E W : Zhou, Haoyang; Appelt, Oona; Tjallingii, Rik; Bachmann, Kai; Trumbull, Robert 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. GFZ Data Services. https://doi.org/10.5880/GFZ.3.1.2022.005

Abstract

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.

Authors

Zhou, Haoyang;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;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.;GFZ German Research Centre for Geosciences, Potsdam, Germany

Contact

Trumbull, Robert B.; GFZ German Research Centre for Geosciences, Potsdam, Germany;

Contributors

Microprobe Lab (GFZ German Research Centre for Geosciences, Germany); Laboratory for XRF Element Scanning ((GFZ German Research Centre for Geosciences, Germany)

Funders

Bundesministerium für Bildung und Forschung: AMREP (033R199)

Keywords

GCMD Science Keywords

EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES

More Metadata

datacite: download xml
- resource (xsi:schemaLocation=http://datacite.org/schema/kernel-4 http://schema.datacite.org/meta/kernel-4.3/metadata.xsd)
  - identifier (identifierType=DOI): 10.5880/GFZ.3.1.2022.005
  - creators
    - creator
      - creatorName (nameType=Personal): Zhou, Haoyang
      - givenName: Haoyang
      - familyName: Zhou
      - nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-0079-503X
      - affiliation: Natural History Museum, University of Oslo, Oslo, Norway
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
    - creator
      - creatorName (nameType=Personal): Appelt, Oona
      - givenName: Oona
      - familyName: Appelt
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
    - creator
      - creatorName (nameType=Personal): Tjallingii, Rik
      - givenName: Rik
      - familyName: Tjallingii
      - nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-9723-3622
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
    - creator
      - creatorName (nameType=Personal): Bachmann, Kai
      - givenName: Kai
      - familyName: Bachmann
      - affiliation: Helmholtz-Centre Dresden-Rossendorf, Helmholtz Institute Freiberg of Resource Technology, Freiberg, Germany
    - creator
      - creatorName (nameType=Personal): Trumbull, Robert B.
      - givenName: Robert B.
      - familyName: Trumbull
      - nameIdentifier (nameIdentifierScheme=ORCID): 0000-0002-1999-4653
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
  - titles
    - title: 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
  - publisher: GFZ Data Services
  - publicationYear: 2023
  - subjects:
  - contributors
    - contributor (contributorType=HostingInstitution)
      - contributorName: Microprobe Lab (GFZ German Research Centre for Geosciences, Germany)
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
    - contributor (contributorType=HostingInstitution)
      - contributorName: Laboratory for XRF Element Scanning ((GFZ German Research Centre for Geosciences, Germany)
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
    - contributor (contributorType=ContactPerson)
      - contributorName: Trumbull, Robert B.
      - affiliation: GFZ German Research Centre for Geosciences, Potsdam, Germany
  - resourceType (resourceTypeGeneral=Dataset): Dataset
  - relatedIdentifiers
    - relatedIdentifier (relatedIdentifierType=DOI relationType=IsSupplementTo): 10.1007/s00126-023-01167-x
    - relatedIdentifier (relatedIdentifierType=DOI relationType=Cites): 10.1017/S1431927617000460
    - relatedIdentifier (relatedIdentifierType=DOI relationType=Cites): 10.3749/canmin.1700094
    - relatedIdentifier (relatedIdentifierType=DOI relationType=Cites): 10.1016/j.minpro.2006.07.018
    - relatedIdentifier (relatedIdentifierType=DOI relationType=Cites): 10.1007/s00710-014-0363-1
  - sizes:
  - formats:
  - rightsList
    - rights (rightsURI=http://creativecommons.org/licenses/by/4.0/): CC BY 4.0
  - descriptions
    - description (descriptionType=Abstract)
      - br:
      - br:
      - br:
      - br:
  - geoLocations
    - geoLocation
      - geoLocationPlace: Thaba Mine, northwestern Bushveld Complex, South Africa
  - fundingReferences
    - fundingReference
      - funderName: Bundesministerium für Bildung und Forschung
      - funderIdentifier (funderIdentifierType=Crossref Funder ID): http://doi.org/10.13039/501100002347
      - awardNumber: 033R199
      - awardTitle: AMREP
iso19115: download xml
- MD_Metadata (xsi:schemaLocation=http://www.isotc211.org/2005/gmd http://www.isotc211.org/2005/gmd/gmd.xsd)
  - fileIdentifier
    - CharacterString: 10.5880/GFZ.3.1.2022.005
  - language
    - LanguageCode (codeList=http://www.loc.gov/standards/iso639-2/ codeListValue=eng): eng
  - characterSet
    - MD_CharacterSetCode (codeListValue=utf8 codeList=http://www.isotc211.org/2005/resources/codeList.xml#MD_CharacterSetCode):
  - hierarchyLevel
    - MD_ScopeCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ScopeCode codeListValue=dataset): dataset
  - hierarchyLevelName
    - CharacterString:
  - contact
    - CI_ResponsibleParty
      - organisationName
        CharacterString: GFZ German Research Centre for Geosciences
      - contactInfo
        CI_Contact
        address
        CI_Address
        electronicMailAddress
        CharacterString: datapub(_at_)gfz-potsdam.de
        onlineResource
        CI_OnlineResource
        linkage
        URL: http://www.gfz-potsdam.de
        name
        CharacterString: Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences
        description
        CharacterString: Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences
      - role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=pointOfContact): pointOfContact
  - dateStamp
    - Date: 2023-03-17
  - referenceSystemInfo
    - MD_ReferenceSystem
      - referenceSystemIdentifier
        RS_Identifier
        code
        CharacterString: urn:ogc:def:crs:EPSG:4326
  - identificationInfo
    - MD_DataIdentification
      - citation
        CI_Citation
        title
        CharacterString: 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
        date
        CI_Date
        date
        Date: 2023-03-17
        dateType
        CI_DateTypeCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode codeListValue=revision): revision
        identifier
        MD_Identifier
        code
        CharacterString: doi:10.5880/GFZ.3.1.2022.005
        citedResponsibleParty (xlink:href=http://orcid.org/0000-0002-0079-503X)
        CI_ResponsibleParty
        individualName
        CharacterString: Zhou, Haoyang
        organisationName
        CharacterString: Natural History Museum, University of Oslo, Oslo, Norway
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=author): author
        citedResponsibleParty
        CI_ResponsibleParty
        individualName
        CharacterString: Appelt, Oona
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=author): author
        citedResponsibleParty (xlink:href=http://orcid.org/0000-0002-9723-3622)
        CI_ResponsibleParty
        individualName
        CharacterString: Tjallingii, Rik
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=author): author
        citedResponsibleParty
        CI_ResponsibleParty
        individualName
        CharacterString: Bachmann, Kai
        organisationName
        CharacterString: Helmholtz-Centre Dresden-Rossendorf, Helmholtz Institute Freiberg of Resource Technology, Freiberg, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=author): author
        citedResponsibleParty (xlink:href=http://orcid.org/0000-0002-1999-4653)
        CI_ResponsibleParty
        individualName
        CharacterString: Trumbull, Robert B.
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=author): author
        citedResponsibleParty
        CI_ResponsibleParty
        individualName
        CharacterString: Microprobe Lab (GFZ German Research Centre for Geosciences, Germany)
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=originator): originator
        citedResponsibleParty
        CI_ResponsibleParty
        individualName
        CharacterString: Laboratory for XRF Element Scanning ((GFZ German Research Centre for Geosciences, Germany)
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=originator): originator
        citedResponsibleParty
        CI_ResponsibleParty
        organisationName
        CharacterString: GFZ Data Services
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=publisher): publisher
      - abstract
        CharacterString: 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.
      - pointOfContact
        CI_ResponsibleParty
        individualName
        CharacterString: Trumbull, Robert B.
        organisationName
        CharacterString: GFZ German Research Centre for Geosciences, Potsdam, Germany
        contactInfo
        CI_Contact
        address
        CI_Address
        electronicMailAddress
        CharacterString: bobby(_at_)gfz-potsdam.de
        role
        CI_RoleCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode codeListValue=pointOfContact): pointOfContact
      - descriptiveKeywords
        MD_Keywords
        keyword
        CharacterString:
      - descriptiveKeywords
        MD_Keywords
        keyword
        CharacterString: EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROPERTIES
        thesaurusName
        CI_Citation
        title
        CharacterString: NASA/GCMD Earth Science Keywords
        date
        CI_Date
        date (gco:nilReason=missing):
        dateType
        CI_DateTypeCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode codeListValue=publication): publication
      - resourceConstraints (xlink:href=http://creativecommons.org/licenses/by/4.0/)
        MD_Constraints
        useLimitation
        CharacterString: CC BY 4.0
      - resourceConstraints
        MD_LegalConstraints
        accessConstraints
        MD_RestrictionCode (codeList=http://www.isotc211.org/2005/resources/codeList.xml#MD_RestrictionCode codeListValue=otherRestrictions):
        otherConstraints
        CharacterString: CC BY 4.0
      - resourceConstraints
        MD_SecurityConstraints
        classification
        MD_ClassificationCode (codeList=http://www.isotc211.org/2005/resources/codeList.xml#MD_ClassificationCode codeListValue=unclassified):
      - aggregationInfo
        MD_AggregateInformation
        aggregateDataSetIdentifier
        RS_Identifier
        code
        CharacterString: 10.1007/s00126-023-01167-x
        codeSpace
        CharacterString: DOI
        associationType
        DS_AssociationTypeCode (codeList=http://datacite.org/schema/kernel-4 codeListValue=IsSupplementTo): IsSupplementTo
      - aggregationInfo
        MD_AggregateInformation
        aggregateDataSetIdentifier
        RS_Identifier
        code
        CharacterString: 10.1017/S1431927617000460
        codeSpace
        CharacterString: DOI
        associationType
        DS_AssociationTypeCode (codeList=http://datacite.org/schema/kernel-4 codeListValue=Cites): Cites
      - aggregationInfo
        MD_AggregateInformation
        aggregateDataSetIdentifier
        RS_Identifier
        code
        CharacterString: 10.3749/canmin.1700094
        codeSpace
        CharacterString: DOI
        associationType
        DS_AssociationTypeCode (codeList=http://datacite.org/schema/kernel-4 codeListValue=Cites): Cites
      - aggregationInfo
        MD_AggregateInformation
        aggregateDataSetIdentifier
        RS_Identifier
        code
        CharacterString: 10.1016/j.minpro.2006.07.018
        codeSpace
        CharacterString: DOI
        associationType
        DS_AssociationTypeCode (codeList=http://datacite.org/schema/kernel-4 codeListValue=Cites): Cites
      - aggregationInfo
        MD_AggregateInformation
        aggregateDataSetIdentifier
        RS_Identifier
        code
        CharacterString: 10.1007/s00710-014-0363-1
        codeSpace
        CharacterString: DOI
        associationType
        DS_AssociationTypeCode (codeList=http://datacite.org/schema/kernel-4 codeListValue=Cites): Cites
      - language
        CharacterString: eng
      - characterSet
        MD_CharacterSetCode (codeListValue=utf8 codeList=http://www.isotc211.org/2005/resources/codeList.xml#MD_CharacterSetCode):
      - topicCategory
        MD_TopicCategoryCode: geoscientificInformation
      - extent
        EX_Extent
        description
        CharacterString: Thaba Mine, northwestern Bushveld Complex, South Africa
        geographicElement
        EX_GeographicBoundingBox
        westBoundLongitude
        Decimal: 27.353
        eastBoundLongitude
        Decimal: 27.353
        southBoundLatitude
        Decimal: -24.7486
        northBoundLatitude
        Decimal: -24.7486
  - distributionInfo
    - MD_Distribution
      - transferOptions
        MD_DigitalTransferOptions
        onLine
        CI_OnlineResource
        linkage
        URL: http://doi.org/10.5880/GFZ.3.1.2022.005
        protocol
        CharacterString: WWW:LINK-1.0-http--link
        name
        CharacterString: Data Access - DOI
        description
        CharacterString: Data Access - DOI
        function
        CI_OnLineFunctionCode (codeList=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode codeListValue=http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode_information): information
  - dataQualityInfo
    - DQ_DataQuality
      - scope
        DQ_Scope
        level
        MD_ScopeCode (codeListValue=dataset codeList=http://www.isotc211.org/2005/resources/codeList.xml#MD_ScopeCode):
schema.org download