SHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealand

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dc.contributor.authorPrice, Richard C.
dc.contributor.authorIreland, Trevor R.
dc.contributor.authorMaas, Roland
dc.contributor.authorArculus, Richard J.
dc.date.accessioned2011-10-11T20:42:50Z
dc.date.available2011-10-11T20:42:50Z
dc.date.issued2006
dc.description.abstractPermian–Jurassic ultramafic to felsic intrusive complexes at Bluff Peninsula and in the southern Longwood Range along the Southland coast represent a series of intraoceanic magmatic arcs with ages spanning a time interval of 110 m.y. New SHRIMP U-Pb zircon data for a quartz diorite from the Flat Hill complex, Bluff Peninsula, yield an age of 259 ± 4 Ma, consistent with other geochronological and paleontological evidence confirming a Late Permian age. The new data are consistent with an age of c. 260 Ma for the intrusive rocks of the Brook Street Terrane. SHRIMP U-Pb zircon ages for the southern Longwood Range confirm that intrusions become progressively younger from east to west across the complex. A gabbro at Oraka Point (eastern end of coastal section) has an age of 245 ± 4 Ma and shows virtually no evidence of zircon inheritance. The age is significantly different from that of the Brook Street Terrane intrusives. Zircon ages from the western parts of the section are younger and more varied (203–227 Ma), indicating more complex magmatic histories. A leucogabbro dike from Pahia Point gives the youngest emplacement age of 142 Ma, which is similar to published U-Pb zircon ages for the Anglem Complex and Paterson Group on Stewart Island.en_NZ
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dc.identifier.citationPrice, R.C., Ireland, T.R., Maas, R. & Arculus, R.J. (2006). SHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealand. New Zealand Journal of Geology & Geophysics, 49(3), 291-303.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/5827
dc.language.isoen
dc.publisherThe Royal Society of New Zealanden_NZ
dc.relation.urihttp://www.royalsociety.org.nz/publications/journals/nzjg/2006/025/en_NZ
dc.rightsThis article has been published in the journal: New Zealand Journal of Geology & Geophysics. © 2006 The Royal Society of New Zealand. Used with permission.en_NZ
dc.subjectU-Pb geochronologyen_NZ
dc.subjectzirconen_NZ
dc.subjectSHRIMPen_NZ
dc.subjectgranitesen_NZ
dc.subjectBrook Street Terraneen_NZ
dc.titleSHRIMP ion probe zircon geochronology and Sr and Nd isotope geochemistry for southern Longwood Range and Bluff Peninsula intrusive rocks of Southland, New Zealanden_NZ
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