Correlated Geophysical, Geochemical, and Volcanological Manifestations of Plume‐ridge Interaction Along the Galápagos Spreading Center

Authors

R. S. Detrick, Woods Hole Oceanographic Institution
J. M. Sinton, University of Hawaii
G. Ito, University of Hawaii
J. P. Canales, Woods Hole Oceanographic Institution
M. Behn, Woods Hole Oceanographic Institution
T. Balcic, University of California
B. Cushman, Woods Hole Oceanographic Institution
Jacqueline E. Dixon, University of MiamiFollow
D. W. Graham, Oregon State University
J. J. Mahoney, Woods Hole Oceanographic Institution

Document Type

Article

Publication Date

2002

Keywords

Mantle plumes, mid‐ocean ridges, hotspots

Digital Object Identifier (DOI)

https://doi.org/10.1029/2002GC000350

Abstract

As the Galápagos hot spot is approached from the west along the Galápagos Spreading Center there are systematic increases in crustal thickness and in the K/Ti, Nb/Zr, ³He/⁴He, H₂O, and Na₂O content of lavas recovered from the spreading axis. These increases correlate with progressive transitions from rift valley to axial high morphology along with decreases in average swell depth, residual mantle Bouguer gravity anomaly, magma chamber depth, average lava Mg #, Ca/Al ratio, and the frequency of point‐fed versus fissure‐fed volcanism. Magma chamber depth and axial morphology display a “threshold” effect in which small changes in magma supply result in large changes in these variables. These correlated variations in geophysical, geochemical, and volcanological manifestations of plume‐ridge interaction along the western Galápagos Spreading Center reflect the combined effects of changes in mantle temperature and source composition on melt generation processes, and the consequences of these variations on magma supply, axial thermal structure, basalt chemistry, and styles of volcanism.

Rights Information

Terms of use for work posted in Scholar Commons.

Was this content written or created while at USF?

No

Citation / Publisher Attribution

Geochemistry, Geophysics, Geosystems, v. 3, issue 10, art. 8501

Copyright 2002 by the American Geophysical Union.

Scholar Commons Citation

Detrick, R. S.; Sinton, J. M.; Ito, G.; Canales, J. P.; Behn, M.; Balcic, T.; Cushman, B.; Dixon, Jacqueline E.; Graham, D. W.; and Mahoney, J. J., "Correlated Geophysical, Geochemical, and Volcanological Manifestations of Plume‐ridge Interaction Along the Galápagos Spreading Center" (2002). Marine Science Faculty Publications. 1311.
https://digitalcommons.usf.edu/msc_facpub/1311