The RRR triple junction at the southern end of the Pacific-Cocos East Pacific Rise

Details The RRR triple junction at the southern end of the Pacific-Cocos East Pacific Rise The RRR triple junction at the southern end of the Pacific-Cocos East Pacific Rise

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109...73l&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 109, no. 1-2, March 1992, p. 73-85.

Computer Science

16

Bathymeters, Ocean Bottom, Pacific Ocean, Plates (Tectonics), Tectonics, Crustal Fractures, Geochemistry, Geodynamics, Lava

Scientific paper

A Sea Beam survey of the Pacific-Cocos-Galapagos triple junction at 2 deg 40 arcmin N on the East Pacific Rise (EPR) establishes that it is a ridge-ridge-ridge junction, with the EPR axis making a small but sharp bend where it is intersected by a slow-spreading (15 mm/yr) fast-propagating rift. At the tip of the narrow triangle of crust accreted at this slow-spreading axis is volcanic ridge built on EPR crust. Tholeiitic lavas erupted along the slow-spreading axis, here and at the rather similar Pacific-Nazca-Galapagos junction, differ in minor element and rare earth element geochemistry from lavas on adjacent segments of the EPR axis, being slightly enriched in incompatible elements.

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