Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study

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dc.contributor.authorMarsh, Julian Savilleen_ZA
dc.date.accessioned2016-03-14T07:14:16Z
dc.date.available2016-03-14T07:14:16Z
dc.date.issued1973en_ZA
dc.description.abstractThe Luderitz Alkaline Province, as it is at present known, comprises the subvolcanic central complexes of Drachenberg, Pomona, and Granitberg. An attendant dyke swarm strikes NE-SW and crops out between the latitudes of 27°00' and 27°30' S. Stratigraphic indications (now confirmed by a K/Ar age from Granitberg) are that the Luderitz Province is early-Cretaceous in age and therefore older than the Klinghardt phonolites (Eocene) as well as the smaller melilitite and nephelinite intrusions. Granitberg is a circular foyaite complex, in the centre of which is preserved a large fragment of sedimentary rocks that originally formed the roof of the intrusion. The foyaites have been emplaced into the feldspathic sandstones and dolomites of the Bogenfels Formation, and three major intrusive phases can be recognised. The first phase produced chilled nepheline syenites beneath the roof of the intrusion. These chilled rocks grade downwards into coarse-grained foyaites. The second phase was the emplacement of the Inner Foyaite which crystallized as a cylindrically zoned plug, capped by a zone of layered, laminated, and xenolithrich foyaites. The third phase was the emplacement of the Outer Foyaite, into which the Roof Zone and the Inner Foyaite foundered. The Outer Foyaite is zoned with a miaskitic core, and an agpaitic outer zone.en_ZA
dc.identifier.apacitationMarsh, J. S. (1973). <i>Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Geological Sciences. Retrieved from http://hdl.handle.net/11427/17697en_ZA
dc.identifier.chicagocitationMarsh, Julian Saville. <i>"Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1973. http://hdl.handle.net/11427/17697en_ZA
dc.identifier.citationMarsh, J. 1973. Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Marsh, Julian Saville AB - The Luderitz Alkaline Province, as it is at present known, comprises the subvolcanic central complexes of Drachenberg, Pomona, and Granitberg. An attendant dyke swarm strikes NE-SW and crops out between the latitudes of 27°00' and 27°30' S. Stratigraphic indications (now confirmed by a K/Ar age from Granitberg) are that the Luderitz Province is early-Cretaceous in age and therefore older than the Klinghardt phonolites (Eocene) as well as the smaller melilitite and nephelinite intrusions. Granitberg is a circular foyaite complex, in the centre of which is preserved a large fragment of sedimentary rocks that originally formed the roof of the intrusion. The foyaites have been emplaced into the feldspathic sandstones and dolomites of the Bogenfels Formation, and three major intrusive phases can be recognised. The first phase produced chilled nepheline syenites beneath the roof of the intrusion. These chilled rocks grade downwards into coarse-grained foyaites. The second phase was the emplacement of the Inner Foyaite which crystallized as a cylindrically zoned plug, capped by a zone of layered, laminated, and xenolithrich foyaites. The third phase was the emplacement of the Outer Foyaite, into which the Roof Zone and the Inner Foyaite foundered. The Outer Foyaite is zoned with a miaskitic core, and an agpaitic outer zone. DA - 1973 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1973 T1 - Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study TI - Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study UR - http://hdl.handle.net/11427/17697 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17697
dc.identifier.vancouvercitationMarsh JS. Alkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological study. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Geological Sciences, 1973 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17697en_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.otherGeologyen_ZA
dc.subject.otherPetrologyen_ZA
dc.titleAlkaline igneous rocks of the coastal belt, south of Luderitz, South West Africa : a petrological studyen_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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