Journal article

Trace-element zoning in mantle minerals: Metasomatism and thermal events in the upper mantle

WL Griffin, D Smith, CG Ryan, SY OReilly, TT Win

CANADIAN MINERALOGIST | MINERALOGICAL ASSOC CANADA | Published : 1996

Abstract

Studies of trace-element zoning in mantle-derived minerals can provide important constraints on the nature and time scales of metasomatic processes and thermal events in the upper mantle, and on diffusion rates. Zoning data on garnet in peridotite xenoliths restrict some metasomatic processes to geologically short time-spans (10-104 years) prior to the eruption of the host magmas, and suggest that the metasomatism is genetically connected to the magmatic events or their immediate precursors. Such metasomatism effects major changes in both the major-element and trace-element composition of the rocks, and these xenoliths should not be used to represent large volumes in the mantle. Modeling of ..

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University of Melbourne Researchers