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Science 22 December 1995:
Vol. 270. no. 5244, pp. 1958 - 1961
DOI: 10.1126/science.270.5244.1958
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Reports

Mantle Melting and Basalt Extraction by Equilibrium Porous Flow

C. C. Lundstrom (1),  J. Gill,  Q. Williams,  M. R. Perfit

The chemical composition of mid-ocean ridge basalt, the most prevalent magma type on the planet, reflects the melt's continuous reequilibration with the surrounding mantle during porous flow. Models of basalt extraction that account for the observed uranium-series disequilibria on the Juan de Fuca ridge constrain both the abundance of melt beneath ridges (0.1 to 0.2 percent) and the style of mantle melting. Unlike models that incorporate near-fractional melts (dynamic melting), mixing of equilibrium porous flow melts derived from heterogeneous source materials quantitatively explains the uranium-series observations.


C. C. Lundstrom, J. Gill, Q. Williams, Earth Sciences Board, University of California, Santa Cruz, CA 95064, USA.
M. R. Perfit, Department of Geology, University of Florida, Gainesville, FL 32611, USA.
(1) To whom correspondence should be addressed.


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Mantle Melting and Melt Extraction Processes beneath Ocean Ridges: Evidence from Abyssal Peridotites.
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