New Zealand Journal of Geology and Geophysics abstracts
Clast size characteristics of gravel within rivers of the Waimea Plains,
Nelson
GREG H. BROWNE
Institute of Geological & Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand
JOSEPH T. THOMAS
Tasman District Council
Private Bag 4, Richmond
Nelson, New Zealand
Abstract Gravel within rivers of the Waimea Plains near
Nelson, New Zealand, was derived through the Wairoa Gorge from
Paleozoic-Mesozoic basement rocks to the southeast, and to a lesser extent from
Pleistocene gravels to the west. A downstream reduction of mean clast size and
an increase in sorting occurs in three rivers of the Waimea Plains. Clast form
is dominated by bladed clasts, with a slight tendency with transport distance
to more elongate forms. Clast sizes are apparently larger in the modern rivers
than in fluvial gravels of the Last Glacial period. The smaller clast size in
the Last Glacial deposits may indicate more efficient clast-size reduction in
glacial as opposed to modern-day rivers.
Keywords Waimea Plains; Nelson; clast-size changes; fluvial
deposition
New Zealand Journal of Geology & Geophysics, 2001, Vol. 44: 89-96
0028-8306/01/4401-0089 $7.00/0 (c) The Royal Society of New Zealand
2001
PDF file of entire paper: medium quality (792K); (scanned from paper original: notes about this process)
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