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Article: The geochemistry of tholeiitic and alkalic plutonic suites within the Northland ophiolite, northern New Zealand; magmatism in a back arc basin

TitleThe geochemistry of tholeiitic and alkalic plutonic suites within the Northland ophiolite, northern New Zealand; magmatism in a back arc basin
Authors
KeywordsAlkalic Plutonics
New Zealand
Ophiolite
Tholeiitic Plutonics
Issue Date1997
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeo
Citation
Chemical Geology, 1997, v. 142 n. 3-4, p. 213-223 How to Cite?
AbstractThe Northland ophiolite of New Zealand consists mainly of tholeiitic basalts with subordinate alkalic volcanic rocks. The alkalic rocks occur together with, but are generally younger than the tholeiites. Both the tholeiitic and alkalic suites include minor plutonic intrusives which range from gabbro to plagiogranite. Variations within the tholeiitic plutonic suite can be modelled in terms of low pressure crystal fractionation. The evolution of the alkalic suite is more problematic, because each massif appears to be derived from a slightly different parental magma. New trace element chemistry presented in this study shows that the tholeiitic rocks formed from a mantle source that was compositionally modified by supra-subduction zone processes but that the alkalic suite has a different chemical signature. Nevertheless both suites of rocks are interpreted as having formed in a back arc spreading system. In this environment, the addition of fertile mantle to the supra-subduction wedge, facilitated by subduction roll-back, provided a source for the alkalic rocks with mixed geochemical characteristics. © 1997 Elsevier Science B.V.
Persistent Identifierhttp://hdl.handle.net/10722/178214
ISSN
2015 Impact Factor: 3.482
2015 SCImago Journal Rankings: 2.346
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.issued1997en_US
dc.identifier.citationChemical Geology, 1997, v. 142 n. 3-4, p. 213-223en_US
dc.identifier.issn0009-2541en_US
dc.identifier.urihttp://hdl.handle.net/10722/178214-
dc.description.abstractThe Northland ophiolite of New Zealand consists mainly of tholeiitic basalts with subordinate alkalic volcanic rocks. The alkalic rocks occur together with, but are generally younger than the tholeiites. Both the tholeiitic and alkalic suites include minor plutonic intrusives which range from gabbro to plagiogranite. Variations within the tholeiitic plutonic suite can be modelled in terms of low pressure crystal fractionation. The evolution of the alkalic suite is more problematic, because each massif appears to be derived from a slightly different parental magma. New trace element chemistry presented in this study shows that the tholeiitic rocks formed from a mantle source that was compositionally modified by supra-subduction zone processes but that the alkalic suite has a different chemical signature. Nevertheless both suites of rocks are interpreted as having formed in a back arc spreading system. In this environment, the addition of fertile mantle to the supra-subduction wedge, facilitated by subduction roll-back, provided a source for the alkalic rocks with mixed geochemical characteristics. © 1997 Elsevier Science B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/chemgeoen_US
dc.relation.ispartofChemical Geologyen_US
dc.subjectAlkalic Plutonicsen_US
dc.subjectNew Zealanden_US
dc.subjectOphioliteen_US
dc.subjectTholeiitic Plutonicsen_US
dc.titleThe geochemistry of tholeiitic and alkalic plutonic suites within the Northland ophiolite, northern New Zealand; magmatism in a back arc basinen_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-s2.0-0031426549en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0031426549&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume142en_US
dc.identifier.issue3-4en_US
dc.identifier.spage213en_US
dc.identifier.epage223en_US
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridThompson, GM=7403078084en_US
dc.identifier.scopusauthoridMalpas, J=7006136845en_US
dc.identifier.scopusauthoridSmith, IEM=7404425799en_US

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