The geochemistry and petrogenesis of Carnley Volcano, Auckland Islands, SW Pacific

Gamble, John A.; Adams, Chris J.; Morris, Paul A.; Wysoczanski, Richard J.; Handler, Monica; Timm, Christian

The geochemistry and petrogenesis of Carnley Volcano, Auckland Islands, SW Pacific

dc.contributor.author	Gamble, John A.
dc.contributor.author	Adams, Chris J.
dc.contributor.author	Morris, Paul A.
dc.contributor.author	Wysoczanski, Richard J.
dc.contributor.author	Handler, Monica
dc.contributor.author	Timm, Christian
dc.contributor.funder	Department of Conservation, New Zealand	en
dc.contributor.funder	Victoria University of Wellington	en
dc.contributor.funder	Royal New Zealand Navy
dc.date.accessioned	2018-10-22T11:09:32Z
dc.date.available	2018-10-22T11:09:32Z
dc.date.issued	2018-09-19
dc.date.updated	2018-10-22T10:54:23Z
dc.description.abstract	Intraplate volcanism across Zealandia, South Eastern Australia, the Ross Sea Embayment and Marie Byrd Land in Antarctica define a magmatic province characterised by basalts with elevated 206Pb/204Pb (18.9–22.5), 87Sr/86Sr = ∼0.7035, Light Rare Earth enrichment [(Ce/Yb)n > 10], and convex-up mantle normalised incompatible multi-element patterns, peaking at Nb-Ta, with negative K and Pb anomalies. Trace element abundances and ratios (e.g. Zr/Nb, Y/Zr) resemble Ocean Island Basalts (OIB), distinct from Mid-Ocean Ridge Basalt (MORB), suggesting derivation from OIB-like reservoirs. Our preferred scenario envisages partial melting across the garnet-spinel stability fields involving asthenospheric and lithospheric mantle components. Melts accumulate in a column where the deep (asthenospheric) source is PM and the shallower source a melange of PM and subcontinental lithospheric mantle (DMM+1) enriched by carbonatite. Evolution of primary and near-primary magmas is controlled by olivine + clinopyroxene fractionation. Trachybasalts, trachytes and rhyolites show isotopic evidence for interaction with continental crust.	en
dc.description.sponsorship	Victoria University of Wellington (Internal Grants Fund)	en
dc.description.status	Peer reviewed	en
dc.description.version	Accepted Version	en
dc.format.mimetype	application/pdf	en
dc.identifier.citation	Gamble, J. A., Adams, C. J., Morris, P. A., Wysoczanski, R. J., Handler, M. and Timm, C. (2018) 'The geochemistry and petrogenesis of Carnley Volcano, Auckland Islands, SW Pacific', New Zealand Journal of Geology and Geophysics, 61(4), pp. 480-497. doi:10.1080/00288306.2018.1505642	en
dc.identifier.doi	10.1080/00288306.2018.1505642
dc.identifier.endpage	497	en
dc.identifier.issn	0028-8306
dc.identifier.issn	1175-8791
dc.identifier.issued	4	en
dc.identifier.journaltitle	New Zealand Journal of Geology and Geophysics	en
dc.identifier.startpage	480	en
dc.identifier.uri	https://hdl.handle.net/10468/7028
dc.identifier.volume	61	en
dc.language.iso	en	en
dc.publisher	Taylor & Francis Group, LLC	en
dc.relation.uri	https://figshare.com/articles/The_geochemistry_and_petrogenesis_of_Carnley_Volcano_Auckland_Islands_SW_Pacific/7108760/1
dc.rights	© 2018, Informa UK Limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in New Zealand Journal of Geology and Geophysics on 19 September, 2018, available online: http://www.tandfonline.com/10.1080/00288306.2018.1505642	en
dc.subject	Intra-plate volcanism	en
dc.subject	Auckland Islands	en
dc.subject	Zealandia	en
dc.subject	SW Pacific	en
dc.subject	Magma petrogenesis	en
dc.title	The geochemistry and petrogenesis of Carnley Volcano, Auckland Islands, SW Pacific	en
dc.type	Article (peer-reviewed)	en