Asymmetric Seafloor Spreading south of Australia

  title={Asymmetric Seafloor Spreading south of Australia},
  author={Jeffrey K. Weissel and Dennis E. Hayes},
SINCE mid-1968, the National Science Foundation research vessel Eltanin has operated south of Australia on a systematic geological, geophysical, and oceanographic reconnaissance. North–south tracks at a spacing of 5° longitude or closer transect the area of interest from 140° E to 105° E. The Eltanin data are supplemented by geophysical data from Lamont–Doherty ships, from Australian, French and Japanese sources, and from aeromagnetic tracks. 

Shackleton Mid-Atlantic Ridge Crest Survey near 45°N: No Evidence for Asymmetric Spreading

An eastwards extension of the Hudson Geotraverse has been made aboard R.R.S. Shackleton. The spreading rates have been determined from the magnetic observations and compared with those of Loncarevic

Seafloor Spreading in the Tasman Sea

Magnetic and seismic studies in the Central Tasman Sea show conclusively that it evolved by a process of seafloor spreading between 60 and 80 m.y. BP, suggesting that other marginal basins may have a

The South Australian Continental Margin and the Australian-Antarctic Sector of the Southern Ocean

The Australian-Antarctic sector of the Southern Ocean has been formed by asymmetric sea-floor spreading along an east-west trending ridge (Fig. 1). This ridge (the Southeast Indian Ridge) separates

Deep-Sea drilling from Glomar Challenger in the Southern Ocean

  • D. Drewry
  • Geology, Environmental Science
    Polar Record
  • 1976
A previous article (Polar Record, Vol 16, No 104, p 7243 5) outlined the current results, principally from polar areas, of the Deep Sea Drilling Project (DSDP) obtained during the cruises of the

A marine geophysical study of the Wilkes Land rifted continental margin, Antarctica

SUMMARY The Wilkes Land margin of East Antarctica, conjugate to the southern Australian margin, is a non-volcanic rifted margin that formed during the Late Cretaceous. During 2000–01 and 2001–02,

Isotope evidence of a mantle convection boundary at the Australian-Antarctic Discordance

Basalts from the Southeast Indian Ridge south of Australia form two geographically and isotopically distinct groups that show affinities with either Indian Ocean or Pacific/Atlantic Ocean isotope

Sea-Floor Spreading in the North Atlantic

The magnetic anomaly lineation pattern in the North Atlantic Ocean (between the latitudes of 15° N. and 63° N.) has been examined in light of the hypotheses of sea-floor spreading and plate

Mantle Reservoirs and Migration Associated with Australian-Antarctic Rifting

Leg 187 undertook to trace the boundary between Indian and Pacific, ocean-scale mantle provinces across 10to 30-m.y.-old seafloor of the southeast Indian Ocean between Australia and Antarctica. The



Magnetic Anomalies in the Indian Ocean and Sea-Floor Spreading Continents

A reconnaissance survey of the magnetic anomaly pattern over the Indian Ocean is interpreted in terms of the spreading floor hypothesis. The recent movements of the oceanic crustal blocks and of the

Sea‐floor spreading and continental drift

A geometrical model of the surface of the earth is obtained in terms of rigid blocks in relative motion with respect to each other. With this model a simplified but complete and consistent picture of

Marine Magnetic Anomalies, Geomagnetic Field Reversals, and Motions of the Ocean Floor and

This paper summarizes the results of the three previous papers in this series, which have shown the presence of a pattern of magnetic anomalies, bilaterally symmetric about the crest of the ridge in

Magnetic anomalies in the Pacific and sea floor spreading

The symmetric linear magnetic pattern found over the crest of the Pacific-Antarctic and Juan de Fuca ridges can now be traced across the flanks and into the basins in the North and the South Pacific

Seismicity of the Indian Ocean and a possible nascent island arc between Ceylon and Australia

The epicenters of about 900 earthquakes in the Indian Ocean, Africa, and adjacent areas that occurred from 1950 to 1966 were relocated by computer. These epicenters delineate many transform faults,

The North Pacific: an Example of Tectonics on a Sphere

Individual aseismic areas move as rigid plates on the surface of a sphere. Application of the Mercator projection to slip vectors shows that the paving stone theory of world tectonics is correct and

The fit of the continents around the Atlantic

Fits made by numerical methods, with a ‘least squares’ criterion of fit, for the continents around the Atlantic ocean are described, finding the best fit to be at the 500 fm contour which lies on the steep part of the continental edge.

Sea Floor Spreading, Topography, and the Second Layer

Local sea floor topography and also the thickness of the second layer of the oceanic rise-ridge system appear related to the spreading rate in the region, and the volume of lava discharged in this layer per unit time and per unit length along the crest of the whole active system is relatively constant regardless of the spreads rate.

Seismicity of the South Pacific ocean

A map of earthquake epicenters is presented for the South Pacific Ocean for the period 1957 to 1963. For much of this region the accuracy in locating epicenters has been improved by nearly an order

Rises, trenches, great faults, and crustal blocks

The transform fault concept is extended to a spherical surface. The earth's surface is considered to be made of a number of rigid crustal blocks. It is assumed that each block is bounded by rises