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Geodynamic mixing in the mesosphere boundary layer and the origin of oceanic islands
Author(s) -
Allègre Claude J.,
Turcotte Donald L.
Publication year - 1985
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl012i004p00207
Subject(s) - geology , lithosphere , mantle (geology) , geophysics , geodynamics , boundary layer , mixing (physics) , hotspot (geology) , basalt , paleontology , tectonics , physics , quantum mechanics , thermodynamics
Since the isotopic heterogeneity of ocean island basalts (OIB) is of variable character and requires billions of years to evolve, we propose to explain the observed heterogeneity by mixing between delaminated continental lithosphere, a continental crustal component, depleted mantle and pristine mantle. Such mixing occurs in a boundary layer located at the bottom of the upper mantle from which ascending blobs rise.