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Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy

Ai, Huirong-Anita and Stock, Joann M. and Clayton, Robert and Luyendyk, Bruce (2008) Vertical tectonics of the High Plateau region, Manihiki Plateau, Western Pacific, from seismic stratigraphy. Marine Geophysical Research, 29 (1). pp. 13-26. ISSN 0025-3235. doi:10.1007/s11001-008-9042-0.

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The Manihiki Plateau is an elevated oceanic volcanic plateau that was formed mostly in Early Cretaceous time by hotspot activity. We analyze new seismic reflection data acquired on cruise KIWI 12 over the High Plateau region in the southeast of the plateau, to look for direct evidence of the location of the heat source and the timing of uplift, subsidence and faulting. These data are correlated with previous seismic reflection lines from cruise CATO 3, and with the results at DSDP Site 317 at the northern edge of the High Plateau. Seven key reflectors are identified from the seismic reflection profiles and the resulting isopach maps show local variations in thickness in the southeastern part of the High Plateau, suggesting a subsidence (cooling) event in this region during Late Cretaceous and up to Early Eocene time. We model this as a hotspot, active and centered on the High Plateau area during Early Cretaceous time in a near-ridge environment. The basement and Early Cretaceous volcaniclastic layers were formed by subaerial and shallow-water eruption due to the volcanic activity. After that, the plateau experienced erosion. The cessation of hotspot activity and subsequent heat loss by Late Cretaceous time caused the plateau to subside rapidly. The eastern and southern portions of the High Plateau were rifted away following the cessation of hot spot activity. As the southeastern portion of the High Plateau was originally higher and above the calcium carbonate compensation depth, it accumulated more sediments than the surrounding plateau regions. Apparently coeval with the rapid subsidence of the plateau are normal faults found at the SE edge of the plateau. Since Early Eocene time, the plateau subsided to its present depth without significant deformation.

Item Type:Article
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URLURL TypeDescription
Stock, Joann M.0000-0003-4816-7865
Clayton, Robert0000-0003-3323-3508
Additional Information:© 2008 The Author(s). Received: 2 May 2006; Accepted: 19 January 2008. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. We thank Patricia Persaud for her insightful discussion and numerous suggestions. We also thank graduate and undergraduate students from Caltech and UC Santa Barbara for their assistance on KIWI 12. Research supported by University of California San Diego, Scripps Institution of Oceanography, UC Santa Barbara, and Caltech. Nathaniel B. Palmer multibeam data collection was supported by NSF OPP-0126334. Contribution 8945, Division of Geological and Planetary Sciences, California Institute of Technology. Contribution of the Institute for Crustal Studies, University of California, Santa Barbara, number 0810.
Group:Seismological Laboratory
Funding AgencyGrant Number
University of California San Diego, Scripps Institution of OceanographyUNSPECIFIED
University of California Santa BarbaraUNSPECIFIED
Subject Keywords:Cretaceous; hotspot; isopach map; Manihiki Plateau; seismic reflection
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Other Numbering System NameOther Numbering System ID
Caltech Division of Geological and Planetary Sciences8945
University of California Santa Barbara, Institute for Crustal Studies0810
Issue or Number:1
Record Number:CaltechAUTHORS:20121001-090154547
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34574
Deposited By: Tony Diaz
Deposited On:01 Oct 2012 20:59
Last Modified:09 Nov 2021 23:09

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