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Anomalous uplift and subsidence of the Ontong Java Plateau inferred from CO2 contents of submarine basaltic glasses

Citation

Roberge, J and Wallace, PJ and White, RV and Coffin, MF, Anomalous uplift and subsidence of the Ontong Java Plateau inferred from CO2 contents of submarine basaltic glasses, Geology (Boulder), 33, (6) pp. 501-504. ISSN 0091-7613 (2005) [Refereed Article]


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Copyright Statement

Copyright 2005 Geological Society of America.

DOI: doi:10.1130/G21142.1

Abstract

The Ontong Java Plateau in the western Pacific is anomalous compared to other oceanic large igneous provinces in that it appears to have never formed a large subaerial plateau. Paleoeruption depths (at 122 Ma) estimated from dissolved H2O and CO2 in submarine basaltic glass pillow rims vary from ∼1100 m below sea level (mbsl) on the central part of the plateau to 22003000 mbsl on the northeastern edge. Our results suggest maximum initial uplift for the plateau of 25003600 m above the surrounding seafloor and 1500 400 m of postemplacement subsidence since 122 Ma. Our estimates of uplift and subsidence for the plateau are significantly less than predictions from thermal models of oceanic lithosphere, and thus our results are inconsistent with formation of the plateau by a high-temperature mantle plume. Two controversial possibilities to explain the anomalous uplift and subsidence are that the plateau (1) formed as a result of a giant bolide impact, or (2) formed from a mantle plume but has a lower crust of dense garnet granulite and/or eclogite; neither of these possibilities is fully consistent with all available geological, geophysical, and geochemical data. The origin of the largest magmatic event on Earth in the past 200 m.y. thus remains an enigma.

Item Details

Item Type:Refereed Article
Keywords:large igneous province basalt volatiles mantle plume meteorite impact
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 Earth Sciences
Author:Coffin, MF (Professor Mike Coffin)
ID Code:73691
Year Published:2005
Web of Science® Times Cited:17
Deposited By:Research Division
Deposited On:2011-10-24
Last Modified:2011-11-11
Downloads:0

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