Results 21 to 30 of about 187 (140)

Relative palaeointensity records from the Ontong-Java Plateau [PDF]

Geophysical Journal International, 1994
SUMMARY Rock magnetic, palaeomagnetic and oxygen isotopic results are presented from core RNDB 75p, which was recovered from the Ontong-Java Plateau (OJP). A high degree of uniformity in magnetic properties characterized by relatively small changes in concentration and grain size in the upper 4 m of the core, combined with a lack of coherence between ...
L. Tauxe, N. J. Shackleton
openaire   +1 more source

Seismic Stratigraphy of the Ontong Java Plateau

, 1993
The Ontong Java Plateau, a large, deep-water carbonate plateau in the western equatorial Pacific, is an ideal location for studying responses of carbonate sedimentation to the effects of changing paleoceanographic conditions. These carbonate responses are often reflected in the physical properties of the sediment, which in turn control the appearance ...
Mosher, David, Mayer, Larry A., Shipley, Tom H., Winterer, Edward L., Hagen, Rick A., Marsters, Janice C., Bassinot, Frank, Wilkens, Roy H., Lyle, Mitchell   +8 more
openaire   +1 more source

Compensation of the Ontong Java Plateau by surface and subsurface loading [PDF]

Journal of Geophysical Research: Solid Earth, 2000
Gravity data over Ontong Java Plateau reveal deep crustal structure supporting the plateau's topography. At long wavelengths (>500 km), new shipboard gravity and bathymetry profiles indicate local isostatic compensation. At intermediate wavelengths (250–500 km), however, Bouguer anomalies have large amplitudes, too high to be explained by models of ...
Garrett Ito, Asahiko Taira
openaire   +1 more source

Magmatic Evolution of the Fossil Melanesian Island Arc: Evidence From Lower Miocene Lavas of Malekula Island (Vanuatu)

Geochemistry, Geophysics, Geosystems
The subduction zones in the SW Pacific Ocean are some of the most dynamic plate boundaries on Earth with changes in subduction polarity and subduction initiation processes. The New Hebrides island arc formed some 10 million years ago after the Melanesian
K. M. Haase, K. P. Schneider, B. Pelletier, O. Ishizuka   +3 more
doaj   +1 more source

Dike Swarms in the Oceanic Lithosphere Beneath the Ontong Java Plateau

Geophysical Research Letters
The Ontong Java Plateau (OJP) is believed to have formed through large‐scale Cretaceous volcanism, but the impact of the massive volcanism on the lithosphere remains largely unknown.
Azusa Shito, Daisuke Suetsugu, Akira Ishikawa, Masako Yoshikawa, Takehi Isse, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu   +12 more
doaj   +1 more source

When a Plateau Suppresses a Plume: Disappearance of the Samoan Plume Under the Ontong Java Plateau

AGU Advances
The Samoan hotspot generated an age‐progressive volcanic track that can be traced back to 24 Ma at Alexa Bank, but the trace of the older portion (>24 Ma) of the hotspot track is unclear.
M. G. Jackson, V. A. Finlayson, Bernhard Steinberger, Kevin Konrad   +3 more
doaj   +1 more source

New Evidence for an Episode of Accelerated Environmental Change in the Late Barremian: Geochemical and Paleontological Records from the Subbetic Basin (Western Tethys)

Geosciences
We investigate a new event of accelerated environmental change that was recorded during the late Barremian in the pelagic Subbetic Basin (Western Tethys). Two pelagic sections have been studied using a multi-proxy approach based on C-isotope stratigraphy
Ginés A. de Gea, José Manuel Castro, Miguel Company, Luis O’Dogherty, José Sandoval, María Luisa Quijano, Cristina Sequero, Sandro Froehner, Roque Aguado   +8 more
doaj   +1 more source

IGyTheM: Integrating Geodynamics With Thermodynamics Using Machine Learning

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 5, October 2026.
Abstract Achieving a comprehensive understanding of mantle convection requires integrated models that couple mantle dynamics with thermodynamic properties. Although advances in computational geodynamics have substantially improved our ability to simulate the underlying physical processes, incorporating thermodynamics into self‐consistent geodynamic ...
Qian Yuan, Paul D. Asimow, Michael Gurnis, Paula Antoshechkina, Junjie Dong   +4 more
wiley   +1 more source

Inception and Plate Evolution of the Lau Back‐Arc Basin From Plate Boundary Refinements

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Back‐arc basins are important settings for crustal growth that form in response to both near and far‐field tectonic influences. To better understand the processes that control back‐arc basin initiation and evolution, we present a refined model of the kinematics of opening of the Lau Basin, embedded in a global plate model.
Alan T. Baxter, Mark D. Hannington, Kaitlyn Breker, Christopher Galley, Marc L. Fassbender, Erin Bethell   +5 more
wiley   +1 more source

Basement Structure of the Northern Ontong Java Plateau

, 1993
Site surveys conducted in conjunction with Leg 130 on the Ontong Java Plateau reveal a strong seismic reflector at 0.8 to 1.0 s below the seafloor that drilling at Sites 803 and 807 confirmed is Cretaceous basalt. This reflector is generally smooth, except for the northeastern margin of the plateau, where it forms a series of small, irregularly shaped ...
Hagen, Rick A., Mayer, Larry A., Mosher, David, Kroenke, Loren w., Shipley, Tom H., Winterer, Edward L.   +5 more
openaire   +1 more source