New Zealand Journal of Geology and Geophysics abstracts

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Evolution of the Winton Basin, Southland

J. P. CAHILL

Institute of Geological and Nuclear Sciences
P.O. Box 30 368
Lower Hutt, New Zealand*

*Present address: Ian Brown Associates, P.O. Box 9043, Wellington, New Zealand.

Abstract  The Winton Basin is one of three Cenozoic sedimentary basins preserved in the onshore Southland region of New Zealand. Seismic reflection and petroleum well data have been analysed to reveal the stratigraphy and structural evolution of the basin. The oldest known strata in this basin are late Eocene terrestrial shales, sandstones, and lignites deposited in half grabens that formed as a result of oblique extension. Mid-outer shelf to upper bathyal mudstones were deposited over a wide area during a marine transgression in the Oligocene. Shallowing of the basin and tectonic quiescence led to limestone deposition in the early Miocene. Later, regional tilting resulted in uplift in the north and east and deposition of terrestrial lignites and gravels across the basin and the basement high to the south. Understanding the evolution of the Winton Basin provides an important link between western Southland and the Clutha region, constraining the timing and style of regional tectonic events.

Keywords  Winton Basin; Southland; seismic reflection; basin analysis; tectonics

New Zealand Journal of Geology and Geophysics, 1995, Vol. 38: 245-258

0028-8306/95/3802-0245 $2.50/0 (c) The Royal Society of New Zealand 1995

PDF file of entire paper: medium quality (1607K); (scanned from paper original: notes about this process)

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