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Architecture of Base-of-slope Fans, Mount Messenger Formation, Pukearuhe Beach, 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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R. M. Slatt
R. M. Slatt
2
University of Oklahoma
,
Norman, Oklahoma, USA
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Published:
January 01, 2008

Abstract

At Pukearuhe Beach, the uppermost part of the sand-dominated Mount Messenger Formation is exposed, together with an apparently gradational, upwards transition into the overlying siltstone-dominated Urenui Formation (although the contact is offset by faulting). Magnificent cliff exposures extend left and right from Pukearuhe Road end and continue as far as Whitecliffs, 4 km (2.5 mi) to the north. The Mount Messenger Formation at Pukearuhe Beach comprises thin- to medium-thick interbeds of fine- to very fine-grained sandstone and siltstone. Broad scour-and-fill structures and interleaving channel and channel-overbank deposits are present in several places. The stratigraphie position and depositional architecture suggest deposition on a series of coalescing fan aprons at the base of the slope. These sediments are inferred to be comparable to Mutti Type III turbidites (Mutti, 1985). Thickest sections viewed from the air display several broadly compensating, fining-upward cycles (interpreted as fifth-order), some of which appear to show moundlike geometries and bidirectional downlap.

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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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