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Late Miocene marine fossil-rich, rock-fall, avalanche, mud-flow and debris-flow deposits adjoining and near the western margin of the Tawhero Basin, outer forearc North Island, New Zealand

Published online by Cambridge University Press:  03 November 2011

G. Neef
Affiliation:
School of Geology, University of New South Wales, Sydney, N.S.W. 2052, Australia

Abstract

A late Miocene marine, massive fossil-rich, rock-fall/avalanche deposit, >42 m thick (base unexposed) and mud-flow and debris-flow deposits, commonly 0.2–4 m thick, are present adjoining and near to either margin of a 12 km long segment of the NE-trending Waihoki Fault/fault zone, near Pongaroa, North Wairarapa, North Island, New Zealand. The Waihoki Fault/fault zone lies in the outboard part of the onland part of the forearc. It forms the western margin of the Tawhero Basin, a forearc basin overlying a subducting Pacific plate, during 6.6–25 Ma. The basin had a partly dextral transpression history (especially in the Late Miocene) but the amount of dextral displacement along the Waihoki Fault/fault zone is unknown. It is likely that lightly indurated fossil-rich, rock-fall, mud-flow and debris-flow deposits were derived from the tops of fault slivers that were pushed upwards along the Waihoki Fault/fault zone during dextral faulting to reach the neritic zone.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1999

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