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Evolution of the East Pacific Rise between 3°S and 13°S since the Middle Miocene

Journal Article · · Geophysical Research Letters
Since Middle Miocene time seafloor spreading activity in the southeast Pacific has shifted westward from the Galapagos Rise, then the last active segment of the Farallon Ridge system in the South Pacific, to the East Pacific Rise. This shift was accomplished by three large jumps of fracture‐zone‐bound axial sections which progressed from south to north. The jumps spanned an average distance of 750 km and occurred 8.2, 6.4 and 5.7 m.y. ago respectively. Positioning of the newly‐formed axes along the EPR trend apparently was controlled by asthenospheric rather than lithospheric phenomena.
Research Organization:
Department of Atmospheric and Oceanic Science, The University of Michigan, Ann Arbor, Michigan 48100
OSTI ID:
6920786
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 7 Vol. 5; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)
Country of Publication:
United States
Language:
English

References (9)

Energy dissipation and geometric structure at spreading plate boundaries journal November 1973
Geologic Evolution of the Northern Nazca Plate journal January 1974
Analysis of a fast-spreading rise crest: The East Pacific Rise, 9� to 12� south journal August 1976
Topography and evolution of the East Pacific Rise between 5°S and 20°S journal April 1972
Elevation of ridges and evolution of the central eastern Pacific journal November 1971
A Topographic Interpretation of the Mathematician Ridge, Clipperton Ridge, East Pacific Rise System journal January 1973
Changes in the axial configuration of the East Pacific Rise near 6°S during the past 2 m.y. journal March 1976
Morphology and Tectonic Evolution of the East-Central Pacific journal January 1975
Sea-Floor Spreading and the Cenozoic History of the East-Central Pacific journal January 1972

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Related Subjects

58 GEOSCIENCES
580500* -- Oceanography-- (1980-1989)
EARTH CRUST
FAILURES
FRACTURES
PACIFIC OCEAN
PLATE TECTONICS
SEA-FLOOR SPREADING
SEAS
SURFACE WATERS
TECTONICS