Structure and Tectonic History Eastern Panama Basin

Structure and Tectonic History Eastern Panama Basin

New marine geophysical data allow the preparation of revised barhymerrfc and magnetic anomaly chans of the Panama Basin and Jemonstrate rhat the eastern pan of the basin, between the fracture zone at long 83"W and the Colombian continental margin, was iormed by highly asymmetric sea-floor spreading along the boundJry of the Nazca and Cocos plates 27 to 8 m.y. B.P. Lineated Magnetic anomalies recording rhis history are oriented approximately east-west.
Contenido: lNTRODUCTION; BATHYMETRY; SEPARATION OF MALPELO AND CARNEGIE RIDGES; CRUST NORTH. OF MALPELO RlDGE; ORIGIN AND FATE OF OCEANIC CRUST EAST OF YAQUINA GRABEN; INTERPRETATION OF THE TECTONIC HISTORY; COMPARISON WITH OTHER TECTONIC INTERPRETATIONS; SPECULATIONS ON CAUSES; CONCLUSIONS.

Peter Lonsdale; Kim D. Klitgord