Thermal history of the early Miocene Waitemata Basin and adjacent Waipapa Group, North Island, New Zealand

Show simple item record Raza, A. en Brown, R.W. en Ballance, P.F. en Hill, K.C. en Kamp, P.J.J. en 2009-08-25T06:02:33Z en 2009-08-25T06:02:33Z en 1999 en
dc.identifier.citation New Zealand Journal of Geology and Geophysics 42 (2), 169-188. 1999 en
dc.identifier.issn 0028-8306 en
dc.identifier.other eid=2-s2.0-0033149865 en
dc.identifier.uri en
dc.description An open access copy of this article is available from the publishers website. en
dc.description.abstract Apatite fission track (AFT) and vitrinite reflectance (VR) data for early Miocene outcrops from the Waitemata Basin reveal that the basin sequence was subjected to shallow burial before denudation. AFT results suggest that the total sediment thickness within the basin was <=1 km and maximum paleotemperatures during burial never exceeded c. 60deg.C. Statistical analyses of the detrital AFT ages distinguish four dominant sources of sediment supply: contemporaneous volcanism; metagreywacke rocks of the Waipapa Group; the Northland Allochthon; and an unidentified source south of the basin. The apatite and zircon fission track results from the Waipapa Group rocks (Gondwana Terrane) adjacent to the basin suggest two discrete phases of accelerated cooling: the first during the early Cretaceous (c. 117 Ma) and the second during the mid Cretaceous (c. 84 Ma). These events probably reflect key stages in the tectonic development of the New Zealand microcontinent during the Cretaceous period, the earlier event being related to the climax of compressional deformation (Rangitata Orogeny) and the latter to extensional tectonism associated with the opening of the Tasman Sea. Waipapa Group rocks now exposed at the surface cooled from maximum paleotemperatures of c. 250deg.C at an estimated rate of c. 180-36deg.C/m.y., involving substantial denudation. en
dc.publisher Royal Society Of New Zealand en
dc.relation.ispartofseries New Zealand Journal of Geology and Geophysics en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from en
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dc.source.uri en
dc.title Thermal history of the early Miocene Waitemata Basin and adjacent Waipapa Group, North Island, New Zealand en
dc.type Journal Article en
dc.subject.marsden Fields of Research::260000 Earth Sciences::260100 Geology en
pubs.issue 2 en
pubs.begin-page 169 en
pubs.volume 42 en
dc.rights.holder Copyright: Royal Society of New Zealand en
pubs.end-page 188 en

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