ORCID Profile
0000-0001-9087-8711
Current Organisation
University of Tokyo
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Publisher: Springer Science and Business Media LLC
Date: 24-05-2021
DOI: 10.1038/S43247-021-00169-9
Abstract: The Ontong Java Plateau in the western Pacific Ocean is the world’s largest oceanic plateau. It was formed 122 million years ago by a massive volcanic event that significantly affected Earth’s environment. The cause of the magmatic event remains controversial because the upper mantle structure beneath the plateau is poorly known. Here we use passive seismic data obtained through seafloor observations, alongside existing seismic data, to determine the three-dimensional radially anisotropic shear wave velocity to depths of up to 300 km. We find that the lithosphere–asthenosphere boundary is approximately 40 km deeper beneath the centre of the Ontong Java Plateau than beneath the surrounding seafloor. Based on our results and petrological and rheological constraints, we propose that the lithosphere–asthenosphere boundary has deepened as a result of underplating of dehydrated residual material beneath the pre-existing lithosphere during formation of the Ontong Java Plateau by a thermochemical mantle plume.
Publisher: American Geophysical Union (AGU)
Date: 2006
DOI: 10.1029/2006GL026872
Publisher: Elsevier BV
Date: 11-2010
Publisher: American Geophysical Union (AGU)
Date: 06-2006
DOI: 10.1029/2005JB003750
Publisher: Elsevier BV
Date: 15-02-2009
Publisher: Springer Science and Business Media LLC
Date: 04-2012
Publisher: Copernicus GmbH
Date: 23-03-2020
DOI: 10.5194/EGUSPHERE-EGU2020-6480
Abstract: & & The Ontong Java Plateau (OJP), one of the largest oceanic plateaus located in the western Pacific Ocean, was first formed by a massive volcanism at 122 Ma, which had a major effect on the Earth's environments, including global climate change, oceanic anoxic events, and mass extinction of marine life. However, the cause of the volcanism remainscontroversial since the underground structure beneath the OJP has been poorly understood due to limited geophysical and geochemical data. To improve such situation, we conducted about 1.6-year long-term seafloor observation on the OJP and its vicinity. Using seismograms obtained by this observation as well as those from existing seismic stations, we obtained three dimensional radially anisotropic shear wave velocity structure beneath the OJP at depths down to 300 km.& & & & Obtained structure shows the following new features:& & & & (1) Beneath the Caroline Islands, in the north of the OJP, 1 % slow anomalies exist, which may be associated with the Caroline hotspot activity & & & & (2) In the center of the OJP at depths between 70& #8211 km, about 2% fast anomalies, whose shear wave speed is about 4.45-4.55 km/s, exists.& & & & (3) The seismic structure clearly shows that the lithosphere& #8211 asthenosphere boundary (LAB) beneath the center of the OJP is located about 40 km deeper than that beneath the surrounding normal oceanic seafloor.& & & & Judging from our results and petrological/rheological constraints given by previous studies, we interpret that the LAB is deepened by dehydrated residual material from hot mantle plume underplating a pre-existing lithosphere during a formation of OJP.& &
Publisher: Elsevier BV
Date: 03-2019
Location: No location found
No related grants have been discovered for Takehi Isse.