Journal ArticleDOI
Origin of the Torlesse Terrane and Coeval Rocks, North Island, New Zealand
TLDR
On the basis of differing areal extent, age, petrographic modes, and bulk chemical composition, the sandstones of the northern quarter of the Torlesse terrane are subdivided into four new petrofaci....Abstract:
On the basis of differing areal extent, age, petrographic modes, and bulk chemical composition, the sandstones of the northern quarter of the Torlesse terrane are subdivided into four new petrofaci...read more
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Journal ArticleDOI
New Zealand's Geological Foundations
TL;DR: In New Zealand, the Cambrian to Early Cretaceous basement can be described in terms of nine major volcano-sedimentary terranes, three composite regional batholiths, and three regional metamorphic-tectonic belts as discussed by the authors.
Journal ArticleDOI
Magma Generation at a Large, Hyperactive Silicic Volcano (Taupo, New Zealand) Revealed by U–Th and U–Pb Systematics in Zircons
Bruce L. A. Charlier,Colin J. N. Wilson,Jacob B. Lowenstern,Stephen Blake,P. van Calsteren,Jon P. Davidson +5 more
TL;DR: The model-age spectra, coupled with zircon-dissolution modelling, highlight contrasts between short-term silicic magma generation at Taupo, by bulk remobilization of crystal mush and assimilation of metasediment and/or silicics plutonic basement rocks, and the longer-term processes of fractionation from crustally contaminated mafic melts as mentioned in this paper.
Journal ArticleDOI
Structural controls on hydrothermal flow in a segmented rift system, Taupo Volcanic Zone, New Zealand
Journal ArticleDOI
Tectonic reconstructions of New Zealand: 40 Ma to the Present
TL;DR: In this article, a reconstruction of the New Zealand subcontinent from 40 Ma to the present is presented, with assumptions that have constrained the model including semi-straight initial alignment of basement terranes and markers; Australian plate fixed; onset of Emerald Basin spreading at c. 45 Ma; and Pacific plate subduction north of New Zealand from c. 30 Ma.
Journal ArticleDOI
Basement geology and tectonic development of the greater New Zealand region: an interpretation from regional magnetic data
TL;DR: The magnetic signature of marginal ocean crust around New Zealand also offers clues into the region's tectonic history as discussed by the authors, which supports the hypothesis that CMAS anomalies are sourced by Carboniferous-Cretaceous arc-related igneous rocks.
References
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Journal ArticleDOI
Trace element discrimination diagrams for the tectonic interpretation of granitic rocks
TL;DR: In this article, a data bank containing over 600 high quality trace element analyses of granites from known settings was used to demonstrate using ORG-normalized geochemical patterns and element-SiO2 plots that most of these granite groups exhibit distinctive trace element characteristics.
Journal ArticleDOI
Determination of Tectonic Setting of Sandstone-Mudstone Suites Using $SiO_{2}$ Content and $K_{2}O/Na_{2}O$ Ratio
B. P. Roser,R. J. Korsch +1 more
TL;DR: In this article, the authors showed that sandstones from different tectonic settings possess characteristic chemistry, particularly $$SiO(2)$ content and $$K 2 O/Na 2 O$ ratio.
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The Effect of Grain Size on Detrital Modes: A Test of the Gazzi-Dickinson Point-Counting Method
Raymond V. Ingersoll,Thomas F. Bullard,Richard L. Ford,Joel P. Grimm,John D. Pickle,Steven W. Sares +5 more
TL;DR: The Gazzi-Dickinson point counting method as mentioned in this paper assigns sand-sized crystals and grains within larger fragments to the category of the crystal or grain, rather than to the larger fragment.
Journal ArticleDOI
Provenance signatures of sandstone-mudstone suites determined using discriminant function analysis of major-element data
B.P. Roser,R.J. Korsch +1 more
TL;DR: In this paper, a set of functions using oxide Al 2 O 3 ratios are designed for samples influenced by biogenic sedimentation, which are applicable only to rocks which lack significant biogenic fractions, or to those where analyses can be corrected for these inputs.