Mathematics – Logic
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994natur.367..157g&link_type=abstract
Nature (ISSN 0028-0836), vol. 367, no. 6459, p. 157-159
Mathematics
Logic
41
Basalt, Calderas, Geochemistry, Geochronology, Geological Surveys, Lava, Planetary Geology, Plateaus, Volcanoes, Volcanology, Earth Crust, Mass Spectroscopy, Spreading
Scientific paper
Recent detailed surveys of the East Pacific Rise have revealed the complexity of the volcanic and magmatic processes occurring along and across fast-spreading ocean ridge crests. In parallel with geological and geochemical investigations, it is now possible to investigate the temporal and spatial pattern of volcanism at ocean ridges by dating young basalts using mass spectrometric uranium-series disequilibria methods. Here we use U-238-Th-230 and U-235-Pa-231 ages for basalts to quantify the spatial extent of young volcanism and crustal accretion at 9 deg 31 min N on the East Pacific Rise. Most of the ages are younger than would be expected based on off-axis distance and spreading rate. We infer from these anomalously young ages that most of the dated basalts on the crestal plateau were erupted 0.5-2 km outside the axial summit caldera, with some volcanism occurring as far as 4 km off-axis. Melts erupted outside the axial summit caldera can have crustal residence times and magmatic supply systems that differ from those of axial lavas.
Batiza Rodey
Fornari Daniel J.
Goldstein Steven J.
Murrell Michael T.
Perfit Michael R.
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