Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys

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dc.contributor.advisorFrimmel, Hartwig Een_ZA
dc.contributor.authorHoffmann, Dennisen_ZA
dc.date.accessioned2016-11-01T10:33:41Z
dc.date.available2016-11-01T10:33:41Z
dc.date.issued1993en_ZA
dc.description.abstractThe Broken Hill deposit, Aggeneys, is a metamorphosed stratiform Cu-Pb-Zn-Ag sulphide deposit situated in the mid-Proterozoic supracrustal sequence of the Bushmanland Subprovince in the Namaqualand Metamorphic Complex. The deposit comprises two superposed orebodies, each consisting mainly of massive sulphide lenses and iron formation which are hosted within a metapelitic schist close to major quartzite horizons. This study is concerned with the tectonically lower orebody (LOB). The iron formation is magnetite-rich and contains varying proportions of (Fe,Mn)-rich silicates (garnet, amphibole, olivine, orthopyroxene, pyroxenoid), quartz and Cu-Pb-Zn-sulphides. These minerals occur in mm- to 5 cm-thick bands and are often traceable over tens of metres. The well preserved banding is considered to represent bedding. Five different varieties of silicate-rich mesobands in the iron formation can be distinguished based on the predominant mineral assemblage: (a) amphibole-olivine-quartz +/- garnet, (b) amphibole-quartz, (c) garnet-apatite-quartz +/- amphibole, (d) garnet-apatite-quartzorthopyroxene, (e) pyroxferroite-quartz +/- amphibole and (f) quartz. These rocks all contain magnetite, and Ba-rich biotite is common but is not always present.en_ZA
dc.identifier.apacitationHoffmann, D. (1993). <i>Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/22396en_ZA
dc.identifier.chicagocitationHoffmann, Dennis. <i>"Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1993. http://hdl.handle.net/11427/22396en_ZA
dc.identifier.citationHoffmann, D. 1993. Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hoffmann, Dennis AB - The Broken Hill deposit, Aggeneys, is a metamorphosed stratiform Cu-Pb-Zn-Ag sulphide deposit situated in the mid-Proterozoic supracrustal sequence of the Bushmanland Subprovince in the Namaqualand Metamorphic Complex. The deposit comprises two superposed orebodies, each consisting mainly of massive sulphide lenses and iron formation which are hosted within a metapelitic schist close to major quartzite horizons. This study is concerned with the tectonically lower orebody (LOB). The iron formation is magnetite-rich and contains varying proportions of (Fe,Mn)-rich silicates (garnet, amphibole, olivine, orthopyroxene, pyroxenoid), quartz and Cu-Pb-Zn-sulphides. These minerals occur in mm- to 5 cm-thick bands and are often traceable over tens of metres. The well preserved banding is considered to represent bedding. Five different varieties of silicate-rich mesobands in the iron formation can be distinguished based on the predominant mineral assemblage: (a) amphibole-olivine-quartz +/- garnet, (b) amphibole-quartz, (c) garnet-apatite-quartz +/- amphibole, (d) garnet-apatite-quartzorthopyroxene, (e) pyroxferroite-quartz +/- amphibole and (f) quartz. These rocks all contain magnetite, and Ba-rich biotite is common but is not always present. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys TI - Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys UR - http://hdl.handle.net/11427/22396 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22396
dc.identifier.vancouvercitationHoffmann D. Aspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneys. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22396en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Geological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherGeological Sciencesen_ZA
dc.titleAspects of the geology, geochemistry and metamorphism of the lower orebody, Broken Hill deposit, Aggeneysen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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