Provenance of Cretaceous accretionary wedge sediments: The Mangapokia Formation, Wairarapa, New Zealand

Barnes, Philip M.

doi:10.1080/00288306.1990.10427578

Cited by 18 publications

(20 citation statements)

References 32 publications

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“…For the Rakaia sub‐terrane, averages were calculated from MacKinnon's () Petrofacies 1 through 4. The modal percentages of Petrofacies 5 (MacKinnon, ; Roser and Korsch, ) were used for the Pahau terrane, and supported by Barnes' () data. QFL percentages from greywacke within the Esk Head Melange are more difficult to quantify, but data from the greywacke blocks in the melange proper (Botsford, ) and gradational contact into the Pahau terrane (Feary, ) were taken as representative modal percentages.…”

Section: Methodsmentioning

confidence: 99%

Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand

Stahl

Winkler

Quigley

et al. 2013

Earth Surf Processes Landf

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Schmidt hammer (SH) R‐values are reported for surface clasts from numerically dated Holocene and Pleistocene fluvial terraces in the South Island of New Zealand. The R‐values are combined with previously obtained weathering rind, radiocarbon, terrestrial cosmogenic nuclide and luminescence terrace ages to derive SH R‐value chronofunctions for greywacke clasts from four distinct locations. Our results show that different weathering rates affect the form of the SH R‐value versus Age curve, however a fundamental dependency between the two remains constant over timescales ranging from 102 to 105 years. Power law scaling constants suggest changes in clast weathering rates are primarily affected by climatic (precipitation and temperature) and sedimentologic variables (source terrane petrology). Age uncertainties of ~22% of the surface age suggest that Schmidt hammer exposure‐age dating (SHD) is a reliable calibrated‐age dating technique for fluvial terraces. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Methodsmentioning

confidence: 99%

Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand

Stahl

Winkler

Quigley

et al. 2013

Earth Surf Processes Landf

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“…This proposal is supported by the composition of conglomerates in the later petrofacies, which consist largely of Torlesse-like metasediments (MacKinnon, 1983). The model is widely accepted, and is broadly supported by petrographic data from North Island fossil zones 3 and 5 (Korsch, 1984;Foley, Korsch & Orr, 1988; Barnes, 1990;George, 1992).…”

Section: Introductionmentioning

confidence: 94%

Geochemical characterization, evolution and source of a Mesozoic accretionary wedge: the Torlesse terrane, New Zealand

1999

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Whole-rock major and trace element compositions of quartzofeldspathic PermianCretaceous sandstones of the Torlesse terrane, New Zealand, display progressive changes which compare well with published petrographic data. Chemical indices in three Permian-early Late Triassic Rakaia subterrane petrofacies show small contrasts, as do the modes, reflecting original source compositions. A Late Triassic Rakaia petrofacies displays sharp increases in SiO decreases in Ti/Zr and V/La, consistent with partial cannibalistic recycling and a small influx of lithic volcanic detritus. In the post-collisional Late Jurassic-Early Cretaceous Pahau subterrane, SiO 2 /Al 2 O 3 remains high, but other indices decrease to levels seen in the Permian, due to recycling of the earlier Rakaia petrofacies and influx of 10-30 % mafic-intermediate volcaniclastic detritus derived from inboard volcanogenic terranes. The results are confirmed by additional suites, including mudstones, which cover a larger area, but also show that some spatial variation occurs within the terrane as a whole. Whole-rock data and Chemical Index of Alteration indices indicate that the Torlesse was derived from a relatively unweathered source with granodioritic bulk composition. Comparisons with data from a proposed Rakaia source in the New England and Hodgkinson orogens of eastern Australia suggest that the observed chemical and modal compositions cannot be simply derived from that area as presently exposed. chemistry of Torlesse sediments overall with terranes of similar age or tectonic setting (e.g. Graham, 1985;

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“…In the case of greywackes, the major element compositions vary significantly within and across different tectonics regimes (Barnes 1990;Floyd et al 1990;Korsch et al 1993;Banerjee & Bhattacharya 1994;Gill et al 1994;Gu 1994;McDaniel et al 1994;Duller & Floyd 1995;Roser et al 1996;Hayashi et al 1997;Holail & Moghazi 1998;Kalsbeek et al 1998;Hegner et al 2005;Wanas & Abdel-Maguid 2006;Kiminami & Fujii 2007;Dostal & Keppie 2009). Collisional orogenesis typically involves passive margin turbidites and subordinate amounts of arc-derived greywackes.…”

Section: Phase Equilibria Modellingmentioning

confidence: 99%

Consequences of open-system melting in tectonics

Yakymchuk

Brown

2013

JGS

123

139

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Partial melting and melt drainage from deep suprasolidus crust in orogens has important consequences for tectonics. Melt extraction along prograde segments of clockwise P – T paths reduces fertility and increases the density and strength of residual crust, which has implications for further melt production during decompression. Using calculated P – T phase diagrams, implications of stepwise melt loss along clockwise P – T paths for pelite and greywacke are assessed, and density of the progressively more residual source and the potential role of buoyancy in the exhumation of deep crustal rocks are evaluated. Two model P – T paths are considered: isobaric heating at 1.2 GPa followed by decompression to 0.4 GPa at 750, 820 and 890 °C, and prograde heating from the fluid-present solidus at 1.2 GPa to 860 °C at 1.8 GPa followed by isothermal decompression to 0.4 GPa. Both closed-system (undrained) and conditionally open-system (drained by intermittent melt loss) conditions are assessed. If melt is drained along clockwise P – T paths in suprasolidus crust then lower quantities of melt will be generated during decompression than sometimes inferred in tectonic models. Instead, the role of melt transfer through suprasolidus crust and melt accumulation at shallow levels in the anatectic zone should be considered rather than simply invoking the generation of large volumes of melt in decompressing crust.

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Provenance of Cretaceous accretionary wedge sediments: The Mangapokia Formation, Wairarapa, New Zealand

Cited by 18 publications

References 32 publications

Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand

Schmidt hammer exposure‐age dating (SHD) of late Quaternary fluvial terraces in New Zealand

Geochemical characterization, evolution and source of a Mesozoic accretionary wedge: the Torlesse terrane, New Zealand

Consequences of open-system melting in tectonics

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