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A Complete Middle-to-inner Basin-floor-fan Cycle, Mount Messenger Formation, Tongaporutu, New Zealand

By
G. H. Browne
G. H. Browne
1
GNS Science
,
Lower Hutt, New Zealand
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P. R. King
P. R. King
1
GNS Science
,
Lower Hutt, New Zealand
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M. J. Arnot
M. J. Arnot
1
GNS Science
,
Lower Hutt, New Zealand
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K. Helle
K. Helle
1
GNS Science
,
Lower Hutt, New Zealand
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Published:
January 01, 2008

Abstract

This outcrop begins at the Tongaporutu River estuary car park, where a sharp contact between thick-bedded sandstones and underlying slumped siltstones marks the basal sequence boundary of a fining-upwards cycle approximately 100 m (328 ft) thick. The cycle extends along the south bank of the river and for 800 m (2625 ft) along the beach to the south. The non-erosive or mildly erosive base and sheetlike morphology of the interval exposed at the beach and in surrounding hills indicate deposition on the basin floor. Further, the dominance of thick-bedded sands and lack of large-scale internal erosional features implies a middle-fan setting. The vertical stacking pattern reflects changes in relative base-level or autocyclic lobe switching, rather than channel fill. Micropaleontological dating suggests a cycle duration of ∼50 k.y. and very high sedimentation rates of approximately 500 cm (1.6 ft) k.y., equivalent to fifth-order cycle periodicity.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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