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Topographic expression of the Danger Islands Troughs and implications for the tectonic evolution of the Manihiki Plateau, western equatorial Pacific Ocean

Citation

Nakanishi, M and Nakamura, Y and Coffin, MF and Hoernle, K and Werner, R, Topographic expression of the Danger Islands Troughs and implications for the tectonic evolution of the Manihiki Plateau, western equatorial Pacific Ocean, Geological Society of America. Special Papers, 511 pp. 195-220. ISSN 0072-1077 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 The Geological Society of America

DOI: doi:10.1130/2015.2511(11)

Abstract

The Manihiki Plateau in the western equatorial Pacific Ocean is a Cretaceous Large Igneous Province. Several studies have proposed that the Manihiki Plateau was formed by the same mantle plume that formed the Ontong Java and Hikurangi plateaus ca. 125 Ma. Recent multibeam bathymetric surveys of the Manihiki Plateau reveal the morphology of the Danger Islands Troughs (DIT), Suvarov Trough, which are systems of deep troughs within the plateau. The troughs divide the Manihiki Plateau into three distinct provinces, the North Plateau, the Western Plateaus, and the High Plateau. The DIT between the High Plateau and Western Plateaus comprises four en echelon troughs. With one exception, all segments of the DIT are bordered by steep escarpments, to 1500 m high. The basins of the DIT are smooth. Elongated northeast-southwest–striking scarps are common in the southernmost DIT and at the junction between the DIT and Suvarov Trough. The features revealed by the new bathymetric data indicate that a sinistral strike-slip tectonic environment formed the DIT during the break-up into the Manihiki and Hikurangi plateaus, whereas the Suvarov Trough developed after the formation of the DIT.

Item Details

Item Type:Refereed Article
Keywords:Manihiki Plateau, Cretaceous Large Igneous Province, multibeam bathymetric surveys
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine Geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Coffin, MF (Professor Mike Coffin)
ID Code:106066
Year Published:2015
Deposited By:IMAS Research and Education Centre
Deposited On:2016-01-27
Last Modified:2016-08-30
Downloads:0

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