The geochemistry of the Gough Island basalts and their mantle source region

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dc.contributor.advisorLe Roex, Antonen_ZA
dc.contributor.advisorClass, Corneliaen_ZA
dc.contributor.authorLong, David Jen_ZA
dc.date.accessioned2014-07-30T17:26:33Z
dc.date.available2014-07-30T17:26:33Z
dc.date.issued2008en_ZA
dc.descriptionIncludes bibliographical references.
dc.description.abstractTen Gough Island primary magma compositions were calculated for use in constrained forward modelling. The primary magma compositions were calculated by the addition of 14-28% clinopyroxene and equilibrium olivine, in equal proportions, back into the primitive lava compositions in 1 % increments until an Mg# of 69 was reached. Constrained forward modelling methods were used in determining the chemical and mineralogical nature of the mantle source region as well as the required melting parameters required in producing the Gough Island suite of lavas. The models indicate that the full compositional range, as well as the crossing REE patterns at Dy, can be produced through ~5-8% equilibrium melting of a mantle source region composed of garnet lherzolite or ~30-50% melting of a garnet pyroxenite source.en_ZA
dc.identifier.apacitationLong, D. J. (2008). <i>The geochemistry of the Gough Island basalts and their mantle source region</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/4209en_ZA
dc.identifier.chicagocitationLong, David J. <i>"The geochemistry of the Gough Island basalts and their mantle source region."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2008. http://hdl.handle.net/11427/4209en_ZA
dc.identifier.citationLong, D. 2008. The geochemistry of the Gough Island basalts and their mantle source region. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Long, David J AB - Ten Gough Island primary magma compositions were calculated for use in constrained forward modelling. The primary magma compositions were calculated by the addition of 14-28% clinopyroxene and equilibrium olivine, in equal proportions, back into the primitive lava compositions in 1 % increments until an Mg# of 69 was reached. Constrained forward modelling methods were used in determining the chemical and mineralogical nature of the mantle source region as well as the required melting parameters required in producing the Gough Island suite of lavas. The models indicate that the full compositional range, as well as the crossing REE patterns at Dy, can be produced through ~5-8% equilibrium melting of a mantle source region composed of garnet lherzolite or ~30-50% melting of a garnet pyroxenite source. DA - 2008 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - The geochemistry of the Gough Island basalts and their mantle source region TI - The geochemistry of the Gough Island basalts and their mantle source region UR - http://hdl.handle.net/11427/4209 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/4209
dc.identifier.vancouvercitationLong DJ. The geochemistry of the Gough Island basalts and their mantle source region. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/4209en_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.titleThe geochemistry of the Gough Island basalts and their mantle source regionen_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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