Tectonic Evolution Cocos Nazca Spreading Center

Tectonic Evolution Cocos Nazca Spreading Center

Magnetic and bathymetric data from the easrern Pacific have been analyzed and a model for the evolution of the Galapagos region developed. The Farallon piare appears to have broken apart along a pre-existing Pacific-Farallon fracture zone, possibly the Marquesas fracture zone, ar about 25 m.y. B.P. to fonn the Cocos and Nazca plates.
Contenido: ABSTRACT; INTRODUCTION; EYOLUTION OF PACIFIC-COCOS-NAZCA TRIPLE JUNCTION; EVlDENCE FROM OLD MAGNETIC ANOMALIE5; EVOLUTION OF GALAPAGOS AREA; HOTSPOT MODEL FOR EVOLUTION OF GALAPAGOS AREA; ANCESTRAL-RIDGE MODEL FOR EVOLUTION OF GALAPAGOS AREA; PROBLEMS AND SPECULA TIONS; CONCLUSIONS.

RICHARD HEY