Other
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2307k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 21, p. 2307-2310
Other
6
Cones (Volcanoes), Earth Crust, Lithosphere, Tectonics, Volcanoes, Geomorphology, Magma, Plates (Tectonics), Seismology
Scientific paper
Characterization of volcanic knobs observed in Sea Beam bathymetry near the 95 deg W Galapagos propagator system on the Cocos-Nazca spreading axis provides insight into volcanic and tectonic processes at propagators and mid-ocean ridges. Despite evidence suggesting higher magma supply rate at the propagator axis, crust accreted there contains fewer knobs than crust created at the failing or doomed spreading axes. Fissure-fed flows rather than seamount construction are more important along the propagator. The process of transferring lithosphere from one plate to another as this ridge offset migrates through a region destroys about half of the preexisting knobs. Data tentatively suggest that on-axis volcanic cones increase in size and contribution on crustal construction but decrease in abundance with decreasing spreading rate, possibly reflecting the magma plumbing systems in differing thermal regimes.
Brooks Benjamin A.
Kleinrock Martin C.
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