Observations of flexure and the geological evolution of the Pacific Ocean basin

  title={Observations of flexure and the geological evolution of the Pacific Ocean basin},
  author={Anthony B. Watts and J. H. Bodine and Neil M. Ribe},
The response of the Pacific plate to oceanic island and seamount loads has been used to estimate the distribution of ridge crest and off-ridge volcanism on the plate since the late Jurassic. The most extensive event, forming the Hess rise, Line Islands ridge, Necker ridge, and Robbie ridge, occurred on the Pacific/Farallon and Pacific/Phoenix ridge crests during the interval 90–120 Myr BP (Barremian to Turonian). This event, which extended over a much larger area than comparable volcanism on… 
Contrasting geophysical and geochemical signatures of a volcano at the axis of the Wharton Fossil Ridge (N‐E Indian Ocean)
The Styx volcano is a prominent seamount (20–30 km diameter, 2500 m high) located at the axis of the Wharton fossil spreading center (N‐E Indian Ocean), where seafloor spreading stopped 40 Ma ago.
Pacific seamount volcanism in space and time
SUMMARY Seamounts constitute some of the most direct evidence about intraplate volcanism. As such, when seamounts formed and into which tectonic setting they erupted (i.e. on-ridge or off-ridge) are
Geological Evolution of the Nauru Basin, and Regional Implications
Leg 61 originally was planned as a study of sedimentary, paleoceanographic, biostratigraphic, petrologic, magnetic, and tectonic problems in the western Pacific ranging back to Late Jurassic time. To
Planform of mantle convection beneath the Pacific Ocean
The correlation between variations of the bathymetry and of the geoid in the Pacific Ocean suggests that both are the surface expression of mantle convection. The planform of the convection which is
Isostasy and Tectonic Origins of Pacific Seamounts
Previous studies have shown that the response of the Pacific plate to oceanic island and seamount loads can be used to estimate the distribution of ridge-crest, superswell, and normal mid-plate
Orogenic processes in the Alpine collision zone
Compressional systems are usually characterized by a positive topography above the sea level, which is continuously modified by the conjugate effects of tectonic contraction or post-orogenic
The Geology of Hess Rise, Central North Pacific Ocean
The geology of Hess Rise is interpreted from studies of morphology and structure, igneous petrology, sediment lithofacies, seismic stratigraphy, and paleoenvironments. Hess Rise probably formed at a


Lithospheric flexure and uplifted atolls
Contrary to the expectation that islands should monotonicalIy sink as the aging sea floor thermally contracts, some atolls that were formerly at sea level are now elevated as much as 70 m. A eustatic
Intra-plate volcanism
  • D. Turcotte, E. R. Oxburgh
  • Geology
    Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
  • 1978
A significant fraction of the volcanism on the Earth’s surface cannot be associated with plate margin processes. The mantle plume hypothesis is one explanation for this volcanism. Convective plumes
An analysis of isostasy in the world's oceans: 2. Midocean ridge crests
Cross-spectral techniques are used to analyze the relationship between gravity and bathymetry at the Mid-Atlantic Ridge and the East Pacific Rise crests. The resulting transfer functions were used to
The relationship between bathymetry and gravity in the Atlantic Ocean
The free air gravity anomaly and depth are sampled at 2-km intervals along two long, reasonably straight ship tracks across the Atlantic Ocean. The resulting series are then processed as if they were
Cretaceous K‐Ar ages of volcanic rocks from the Musicians Seamounts and the Hawaiian Ridge
K-Ar conventional and 40Ar/39Ar ages on plagioclase from altered basalt samples show that Khatchaturian and Rachmaninoff Seamounts in the Musicians Seamounts, north-central Pacific, are 65.2 ± 2.6
Gravity anomalies and flexure of the lithosphere: A three-dimensional study of the Great Meteor Seamount, northeast Atlantic
Simple models for the flexure of the lithosphere caused by the load of the Great Meteor seamount have been determined for different assumed values of the effective flexural rigidity of the
World-Wide Correlation of Mesozoic Magnetic Anomalies, and Its Implications
In the course of correlating three sets of Mesozoic magnetic lineations in the western Pacific (the Phoenix, Japanese, and Hawaiian lineations), Larson and Chase (1972) determined a paleomagnetic
Radiometric Ages of Kodiak Seamount and Giacomini Guyot, Gulf of Alaska: Implications for Circum-Pacific Tectonics
Kodiak Seamount and Giacomini Guyot have been dated at 22.6 � 1.1 and 19.9 � 1.0 [2σ (standard deviation)] x 106 years, respectively. Concordant whole-rock and plagioclase potassium-argon dates and