Geochemistry and mineralogy of selected Atlantic Ocean basalts

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dc.contributor.advisorErlank, A Jen_ZA
dc.contributor.advisorReid, A Men_ZA
dc.contributor.authorLe Roex, Anton Powteren_ZA
dc.date.accessioned2016-03-28T14:33:01Z
dc.date.available2016-03-28T14:33:01Z
dc.date.issued1980en_ZA
dc.descriptionBibliography: p. 238-268.en_ZA
dc.description.abstractBulk rock compositional variations in lavas from four localities in the Atlantic Ocean are evaluated quantitatively in terms of fractional crystallisation and partial melting models. Samples studied are from the Mid-Atlantic Ridge at 36°49 'N (FAMOUS), from the Islas Orcadas fracture zone on the Southwest Indian Ocean Ridge, from the Conrad fracture zone on the America-Antarctica Ridge and from Bouvet Island, situated at the southernmost tip of the Mid- Atlantic Ridge and in the vicinity of both the fracture zones mentioned above. Bulk rock major and trace element variations in selected basalts from the FAMOUS area, in conjunction with a detailed study of the chemistry of phenocryst minerals and associated melt inclusions are used to place constraints on the genetic relationships between the various lava types. The distribution of NiO in olivine and Cr-spinel phenocrysts distinguishes the picritic basalts, plagioclase phyric basalts and plagioclase-pyroxene basalts from the olivine basalts. The NiO content of these phenocrysts in the former three basalt types is low, or a given Mg Mg+Fe²⁺ atomic ratio of the mineral, relative to the phenocrysts in the olivine basalts. Consideration of the Zr/Nb ratio of the lavas similarly distinguishes the olivine basalts from the plagioclase phyric and plagioclase- pyroxene basalts but, in addition, distinguishes the picritic basalts from the former three basalt types.en_ZA
dc.identifier.apacitationLe Roex, A. P. (1980). <i>Geochemistry and mineralogy of selected Atlantic Ocean basalts</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/18279en_ZA
dc.identifier.chicagocitationLe Roex, Anton Powter. <i>"Geochemistry and mineralogy of selected Atlantic Ocean basalts."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1980. http://hdl.handle.net/11427/18279en_ZA
dc.identifier.citationLe Roex, A. 1980. Geochemistry and mineralogy of selected Atlantic Ocean basalts. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Le Roex, Anton Powter AB - Bulk rock compositional variations in lavas from four localities in the Atlantic Ocean are evaluated quantitatively in terms of fractional crystallisation and partial melting models. Samples studied are from the Mid-Atlantic Ridge at 36°49 'N (FAMOUS), from the Islas Orcadas fracture zone on the Southwest Indian Ocean Ridge, from the Conrad fracture zone on the America-Antarctica Ridge and from Bouvet Island, situated at the southernmost tip of the Mid- Atlantic Ridge and in the vicinity of both the fracture zones mentioned above. Bulk rock major and trace element variations in selected basalts from the FAMOUS area, in conjunction with a detailed study of the chemistry of phenocryst minerals and associated melt inclusions are used to place constraints on the genetic relationships between the various lava types. The distribution of NiO in olivine and Cr-spinel phenocrysts distinguishes the picritic basalts, plagioclase phyric basalts and plagioclase-pyroxene basalts from the olivine basalts. The NiO content of these phenocrysts in the former three basalt types is low, or a given Mg Mg+Fe²⁺ atomic ratio of the mineral, relative to the phenocrysts in the olivine basalts. Consideration of the Zr/Nb ratio of the lavas similarly distinguishes the olivine basalts from the plagioclase phyric and plagioclase- pyroxene basalts but, in addition, distinguishes the picritic basalts from the former three basalt types. DA - 1980 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1980 T1 - Geochemistry and mineralogy of selected Atlantic Ocean basalts TI - Geochemistry and mineralogy of selected Atlantic Ocean basalts UR - http://hdl.handle.net/11427/18279 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/18279
dc.identifier.vancouvercitationLe Roex AP. Geochemistry and mineralogy of selected Atlantic Ocean basalts. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1980 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/18279en_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.otherGeochemistryen_ZA
dc.titleGeochemistry and mineralogy of selected Atlantic Ocean basaltsen_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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