A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex

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dc.contributor.authorMoore, John Michaelen_ZA
dc.date.accessioned2016-11-18T11:26:37Z
dc.date.available2016-11-18T11:26:37Z
dc.date.issued1986en_ZA
dc.descriptionBibliography: pages 346-370.en_ZA
dc.description.abstractA regional study of highly metamorphosed supracrustal rocks was undertaken in the western portions of the Namaqualand Metamorphic Complex. The study area was essentially restricted to a north-south section some 50 kilometres wide and 220 kilometres long. Eight east-west-trending belts of supracrustal rocks were examined, together with several smaller paragneiss remnants, in an area dominated by quartzo-feldspathic gneisses of granitic composition. The supracrustal rocks were classified into seven major lithological groups: quartzitic rocks, metapelitic and metapsammitic rocks, quartzo feldspathic rocks, metabasites, metacarbonate rocks, magnesium-rich cordierite rocks and iron formations. Further subdivision, based on variations in mineral constituents within each group, also occurred, as well as the presence of lithologies with compositions transitional between certain groups. The various supracrustal sequences were subdivided into formations containing minor distinctive members on an informal lithostratigraphic basis. Correlation between the major supracrustal belts was then undertaken. Four subgroups were identified across the study area, comprising a quartzo feldspathic gneiss subgroup and an overlying feldspathic quartzite/garnetcordierite gneiss subgroup that both predominate in the southern and central part of the area, a glassy quartzite/mica- sillimanite schist subgroup that predominates in the northern part, and a cordierite gneiss/metacarbonate subgroup that is restricted to the Geselskapbank synform. The supracrustal rocks appear to have been emplaced on a basement of augen gneisses. This relationship is, however, complicated by the intrusion of granit i c rocks within the contact zone.en_ZA
dc.identifier.apacitationMoore, J. M. (1986). <i>A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/22585en_ZA
dc.identifier.chicagocitationMoore, John Michael. <i>"A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1986. http://hdl.handle.net/11427/22585en_ZA
dc.identifier.citationMoore, J. 1986. A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Moore, John Michael AB - A regional study of highly metamorphosed supracrustal rocks was undertaken in the western portions of the Namaqualand Metamorphic Complex. The study area was essentially restricted to a north-south section some 50 kilometres wide and 220 kilometres long. Eight east-west-trending belts of supracrustal rocks were examined, together with several smaller paragneiss remnants, in an area dominated by quartzo-feldspathic gneisses of granitic composition. The supracrustal rocks were classified into seven major lithological groups: quartzitic rocks, metapelitic and metapsammitic rocks, quartzo feldspathic rocks, metabasites, metacarbonate rocks, magnesium-rich cordierite rocks and iron formations. Further subdivision, based on variations in mineral constituents within each group, also occurred, as well as the presence of lithologies with compositions transitional between certain groups. The various supracrustal sequences were subdivided into formations containing minor distinctive members on an informal lithostratigraphic basis. Correlation between the major supracrustal belts was then undertaken. Four subgroups were identified across the study area, comprising a quartzo feldspathic gneiss subgroup and an overlying feldspathic quartzite/garnetcordierite gneiss subgroup that both predominate in the southern and central part of the area, a glassy quartzite/mica- sillimanite schist subgroup that predominates in the northern part, and a cordierite gneiss/metacarbonate subgroup that is restricted to the Geselskapbank synform. The supracrustal rocks appear to have been emplaced on a basement of augen gneisses. This relationship is, however, complicated by the intrusion of granit i c rocks within the contact zone. DA - 1986 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1986 T1 - A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex TI - A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex UR - http://hdl.handle.net/11427/22585 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22585
dc.identifier.vancouvercitationMoore JM. A comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complex. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1986 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22585en_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.otherGeology, Stratigraphic - Precambrianen_ZA
dc.subject.otherGeology - South Africa - Namaqualanden_ZA
dc.titleA comparative study of metamorphosed supracrustal rocks from the western Namaqualand metamorphic complexen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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