(Table 1) H2O and CO2 contents in submarine basaltic glasses from Ontong Java Plateau


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 2200-3000 mbsl on the northeastern edge. Our results suggest maximum initial uplift for the plateau of 2500-3600 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.

DOI https://doi.org/10.1594/PANGAEA.712440
Related Identifier https://doi.org/10.1130/G21142.1
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.712440
Creator Roberge, Julie ORCID logo; Wallace, Paul J; White, Rosalind V; Coffin, Millard F ORCID logo
Publisher PANGAEA
Publication Year 2005
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 81 data points
Discipline Earth System Research
Spatial Coverage (156.625W, -5.011S, 164.233E, 3.607N); North Pacific Ocean; West equatorial Pacific Ocean; South Pacific Ocean
Temporal Coverage Begin 1990-01-28T00:00:00Z
Temporal Coverage End 2000-10-29T00:00:00Z