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Diffusive Isotopic Contamination of Mafic Magma by Coexisting Silicic Liquid in the Muskox Intrusion

Science
7 Feb 1992
Vol 255, Issue 5045
pp. 708-711

Abstract

Shifts in 87Sr/86Sr and 143Nd/144Nd ratios measured in cumulates from the upper levels of the Muskox mafic intrusion indicate that isotopic and bulk chemical exchange were decoupled across a mafic-silicic liquid interface during crystallization of the intrusion. Modeling of diffusive exchange between liquid layers demonstrates that isotopic compositions of silicate liquids in layered magma chambers may be strongly affected by this process on time scales of 103 to 104 years. Diffusive contamination can be used to place constraints on the physical processes and time scales of magmatic systems.

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Information & Authors

Information

Published In

Science
Volume 255 | Issue 5045
7 February 1992

Submission history

Received: 11 October 1991
Accepted: 2 December 1991
Published in print: 7 February 1992

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Authors

Affiliations

Brian W. Stewart
Berkeley Center for Isotope Geochemistry, Department of Geology and Geophysics, University of California, and Earth Science Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720
Donald J. DePaolo
Berkeley Center for Isotope Geochemistry, Department of Geology and Geophysics, University of California, and Earth Science Division, Lawrence Berkeley Laboratory, Berkeley, CA 94720

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