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The Paleozoic-Mesozoic recycling of the Rakaia Terrane, South Island, New Zealand: sandstone clast and sandstone petrology, geochemistry, and geochronology

Wandres, Anekant; Bradshaw, John D; Ireland, Trevor

Description

The Torlesse terranes - part of the New Zealand Eastern Province - are accretionary complexes that comprise an enormous volume of quartzofeldspathic sandstones and mudstones with subsidiary conglomerates plus minor oceanic assemblages. Two terranes are recognised in the South Island - the Permian to Late Triassic Rakaia Terrane and the Late Jurassic to Early Cretaceous Pahau Terrane. Sandstone clasts from two Rakaia Terrane and two Pahau Terrane conglomerates were collected. We present the...[Show more]

dc.contributor.authorWandres, Anekant
dc.contributor.authorBradshaw, John D
dc.contributor.authorIreland, Trevor
dc.date.accessioned2015-12-13T22:49:30Z
dc.identifier.issn0028-8306
dc.identifier.urihttp://hdl.handle.net/1885/80569
dc.description.abstractThe Torlesse terranes - part of the New Zealand Eastern Province - are accretionary complexes that comprise an enormous volume of quartzofeldspathic sandstones and mudstones with subsidiary conglomerates plus minor oceanic assemblages. Two terranes are recognised in the South Island - the Permian to Late Triassic Rakaia Terrane and the Late Jurassic to Early Cretaceous Pahau Terrane. Sandstone clasts from two Rakaia Terrane and two Pahau Terrane conglomerates were collected. We present the first combined detailed information on petrography and geochemistry of Torlesse conglomerate sandstone clasts and use our own and published U-Pb SHRIMP detrital zircon age data to demonstrate the recycling of the Rakaia Terrane into Rakaia strata itself and into Pahau Terrane strata. Sandstone clast maj or and trace element chemical data largely support petrographic observations derived from thin-section analysis. The similarities of petrographic and geochemical data between sandstone clasts from the Rakaia Terrane and Rakaia sandstones suggest that clasts in the Permian Te Moana and Late Triassic Lake Hill Conglomerates were derived by autocannibalistic reworking of older, consolidated, Rakaia sediments. Data from sandstone clasts from the Pahau Terrane suggest that uplift of the Rakaia Terrane continued into the Cretaceous. These Pahau Terrane clasts indicate that at the time of the Pahau sedimentation Permian to early Late Triassic Rakaia rocks were exposed and recycled into the Pahau Basin.
dc.publisherSir Publishing
dc.sourceNew Zealand Journal of Geology and Geophysics
dc.subjectKeywords: Mesozoic; Paleozoic; sandstone; Australasia; Eastern Hemisphere; New Zealand; South Island; World; Rakaia Geochemistry; Geochronology; Gondwana margin; Pahau Terrane; Petrography; Provenance; Rakaia Terrane; Sandstone; Terrane recycling; Zircon
dc.titleThe Paleozoic-Mesozoic recycling of the Rakaia Terrane, South Island, New Zealand: sandstone clast and sandstone petrology, geochemistry, and geochronology
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume48
dc.date.issued2005
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationMigratedxPub8829
local.type.statusPublished Version
local.contributor.affiliationWandres, Anekant, University of Canterbury
local.contributor.affiliationBradshaw, John D, University of Canterbury
local.contributor.affiliationIreland, Trevor, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage229
local.bibliographicCitation.lastpage245
dc.date.updated2015-12-11T10:35:41Z
local.identifier.scopusID2-s2.0-22944457168
CollectionsANU Research Publications

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