The geology of Flat Hill-Ocean Beach, Bluff Peninsula
|dc.contributor.author||Elder, Damon Jon|
|dc.identifier.citation||Elder, D. J. (1994). The geology of Flat Hill-Ocean Beach, Bluff Peninsula (Thesis, Bachelor of Science with Honours). University of Otago. Retrieved from http://hdl.handle.net/10523/7752||en|
|dc.description||Digital copy stored under Section 55 of the NZ Copyright Act.||en_NZ|
|dc.description.abstract||In the Bluff area lower green schist facies Greenhills Group rocks of the Brook Street terrane derived from a Permian volcanic arc have been intruded by igneous bodies inducing contact metamorphism. Facies of contact metamorphism are observed as as pyroxene hornfels facies in assimilated xenoliths in a hybrid rock zone. Further out from the intrusions hornblende hornfelses are observed. At a distance of 800 m from the intrusive contacts albite-epidote facies of contact metamorphism are observed in metabasaltic dykes. Evidence for this facies comes from the mineral assemblages in the metabasalt dykes which have cut vertically through Greenhills Group metasediments very soon after the tilting of the Greenhills Group bedding associated with the intrusion of the large igneous bodies. The intrusive bodies are the Flat Hill gabbronorite and the Ocean Beach diorite which show a distinct difference in the bulk rock chemistry with the diorite appearing as a more evolved rock. Dyke intrusion of microgabbro, quartz diorite and hornblende pegmatite is part of late stage activity associated with the cooling of the large igneous bodies. Granitic dykes post date the intrusion of the large igneous bodies and the late stage dyke activity. The age of the Flat Hill gabbronorite is given as 265 Ma, the oldest recorded rocks of the Brook Street terrane.||en_NZ|
|dc.publisher||University of Otago|
|dc.title||The geology of Flat Hill-Ocean Beach, Bluff Peninsula||en_NZ|
|thesis.degree.name||Bachelor of Science with Honours||en_NZ|
|thesis.degree.grantor||University of Otago|
|dc.rights.statement||Digital copy stored under Section 55 of the NZ Copyright Act.|
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