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Article: Volcanic geology of Rarotonga, southern Pacific Ocean

TitleVolcanic geology of Rarotonga, southern Pacific Ocean
Authors
KeywordsAlkali Basalt
Ankaramite
Ocean Island Volcanism
Phonolite
Rarotonga
Issue Date1998
PublisherR S N Z Publishing. The Journal's web site is located at http://www.rsnz.govt.nz/publish/nzjgg/
Citation
New Zealand Journal Of Geology And Geophysics, 1998, v. 41 n. 1, p. 95-104 How to Cite?
AbstractThe island of Rarotonga in the southern Pacific is the emergent summit of a Pliocene - Pleistocene volcanic complex built by effusive and pyroclastic eruptions of mainly mafic magma. Petrographically the basaltic rock types are ankaramite and basalt, which range in chemical composition from alkali basalt to nephelinite. Phenocryst assemblages suggest two igneous series, one with a relatively simple equilibrium assemblage of olivine, titanian augite and magnetite, and one with olivine, diopside-augite and titanian augite in which the phenocrysts show disequilibrium textures. These variations reflect fractionation, assimilation, and recharge processes in the upper part of the magmatic system that produced the volcano. The final stages of volcanism at Rarotonga were pyroclastic eruptions of phonolites and effusive eruptions of foidal phonolites, both representing late stage fractionation products. Detailed mapping, together with geochemical work, has prompted a revision of the stratigraphy of the island based on the concept of a single cycle of magmatic activity rather than the Hawaiian style multi-phase evolution favoured by earlier workers.
Persistent Identifierhttp://hdl.handle.net/10722/178215
ISSN
2015 Impact Factor: 1.164
2015 SCImago Journal Rankings: 1.019
References

 

DC FieldValueLanguage
dc.contributor.authorThompson, GMen_US
dc.contributor.authorMalpas, Jen_US
dc.contributor.authorSmith, IEMen_US
dc.date.accessioned2012-12-19T09:43:28Z-
dc.date.available2012-12-19T09:43:28Z-
dc.date.issued1998en_US
dc.identifier.citationNew Zealand Journal Of Geology And Geophysics, 1998, v. 41 n. 1, p. 95-104en_US
dc.identifier.issn0028-8306en_US
dc.identifier.urihttp://hdl.handle.net/10722/178215-
dc.description.abstractThe island of Rarotonga in the southern Pacific is the emergent summit of a Pliocene - Pleistocene volcanic complex built by effusive and pyroclastic eruptions of mainly mafic magma. Petrographically the basaltic rock types are ankaramite and basalt, which range in chemical composition from alkali basalt to nephelinite. Phenocryst assemblages suggest two igneous series, one with a relatively simple equilibrium assemblage of olivine, titanian augite and magnetite, and one with olivine, diopside-augite and titanian augite in which the phenocrysts show disequilibrium textures. These variations reflect fractionation, assimilation, and recharge processes in the upper part of the magmatic system that produced the volcano. The final stages of volcanism at Rarotonga were pyroclastic eruptions of phonolites and effusive eruptions of foidal phonolites, both representing late stage fractionation products. Detailed mapping, together with geochemical work, has prompted a revision of the stratigraphy of the island based on the concept of a single cycle of magmatic activity rather than the Hawaiian style multi-phase evolution favoured by earlier workers.en_US
dc.languageengen_US
dc.publisherR S N Z Publishing. The Journal's web site is located at http://www.rsnz.govt.nz/publish/nzjgg/en_US
dc.relation.ispartofNew Zealand Journal of Geology and Geophysicsen_US
dc.subjectAlkali Basalten_US
dc.subjectAnkaramiteen_US
dc.subjectOcean Island Volcanismen_US
dc.subjectPhonoliteen_US
dc.subjectRarotongaen_US
dc.titleVolcanic geology of Rarotonga, southern Pacific Oceanen_US
dc.typeArticleen_US
dc.identifier.emailMalpas, J: jgmalpas@hku.hken_US
dc.identifier.authorityMalpas, J=rp00059en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0031851313en_US
dc.identifier.hkuros35504-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031851313&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume41en_US
dc.identifier.issue1en_US
dc.identifier.spage95en_US
dc.identifier.epage104en_US
dc.publisher.placeNew Zealanden_US
dc.identifier.scopusauthoridThompson, GM=7403078084en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US
dc.identifier.scopusauthoridSmith, IEM=7404425799en_US

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