Sediments of the Paekakariki-Otaki River sand-dune sequence, New Zealand

Wright, L. W.

doi:10.1080/00288306.1989.10427591

New Zealand Journal of Geology and Geophysics

1989

DOI: 10.1080/00288306.1989.10427591

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Sediments of the Paekakariki-Otaki River sand-dune sequence, New Zealand

L. W. Wright¹

Abstract: nested sieves of 1/4 cp intervals for 9 min. and the data plotted Department of Geography using Folk &Ward (1957) parameters. These are detailed in Queen Mary College Tables 1 and 2. University of London Mile End Road Tablel Grain-size analyses of sand-dune samples from the Kapiti London El 4NS, England (west) coast, southern North Island. using Folk & Ward (1957) parameters. Grid reference* Mean size Sorting Skewness Kurtosis Abstract Thirty-eight samples collected from the southern Southern area North Island… Show more

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Textural and compositional controls on modern beach and dune sands, New Zealand

Kasper‐Zubillaga

Ortiz-Zamora

Dickinson

et al. 2006

Earth Surf Processes Landf

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Textural, compositional, physical and geophysical determinations were carried out on 111 beach and dune sand samples from two areas in New Zealand: the Kapiti-Foxton coast sourced by terranes of andesite and greywackes and the Farewell Spit-Wharariki coast sourced by a wide variety of Paleozoic terranes. Our aim is to understand how long-shore drift, beach width and source rock control the sedimentological and petrographic characteristics of beach and dune sands. Furthermore, this study shows the usefulness of specific minerals (quartz, plagioclase with magnetite inclusions, monomineralic opaque grains) to interpret the physical processes (fluvial discharges, long-shore currents, winds) that distribute beach and dune sands in narrow and wide coastal plains. This was done by means of direct (grain size and modal analyses) and indirect (specific gravity, magnetic/non-magnetic separations M/NM, magnetic susceptibility measurements, hysteresis loops) methods. Results are compared with beach sands from Hawaii, Oregon, the Spanish Mediterranean, Elba Island and Southern California.Compositionally, the Kapiti-Foxton sands are similar to first-order immature sands, which retain their fluvial signature. This results from the high discharge of rivers and the narrow beaches that control the composition of the Kapiti-Foxton sands. The abundance of feldspar with magnetite inclusions controls the specific gravity of the Kapiti-Foxton sands due to their low content of opaque minerals and coarse grain size. Magnetic susceptibility of the sands is related mainly to the abundance of feldspars with Fe oxides, volcanic lithics and free-opaque minerals.The Farewell Spit-Wharariki sands are slightly more mature than the Kapiti-Foxton sands. The composition of the Farewell Spit-Wharariki sands does not reflect accurately their provenance due to the prevalence of long-shore drift, waves, little river input and a wide beach. Low abundance of feldspar with magnetite inclusions and free opaque grains produces poor correlations between specific gravity (Sg) and Fe oxide bearing minerals. The small correlation between opaque grains and M/NM may be related to grain size. The magnetic susceptibility of Farewell Spit-Wharariki sands is low due to the low content of grains with magnetite inclusions. Hysteresis and isothermal remnant magnetization (IRM) agree with the magnetic susceptibility values.

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Textural and compositional controls on modern beach and dune sands, New Zealand

Kasper‐Zubillaga

Ortiz-Zamora

Dickinson

et al. 2006

Earth Surf Processes Landf

View full text Add to dashboard Cite

show abstract

Discriminating depositional environments of sands from modern source terranes using modal analysis

Kasper‐Zubillaga

Dickinson

2001

Sedimentary Geology

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Sediments of the Paekakariki-Otaki River sand-dune sequence, New Zealand

Cited by 2 publications

References 2 publications

Textural and compositional controls on modern beach and dune sands, New Zealand

Textural and compositional controls on modern beach and dune sands, New Zealand

Discriminating depositional environments of sands from modern source terranes using modal analysis

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