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Science 3 August 1984:
Vol. 225. no. 4661, pp. 504 - 505
DOI: 10.1126/science.225.4661.504
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Articles

Cation Diffusion in Plagioclase Feldspar

S. A. MORSE 1

1 Department of Geology and Geography, University of Massachusetts, Amherst 01003

Steep compositional gradients in igneous plagioclase feldspar from slowly cooled intrusive bodies imply a maximum value of the intracrystalline diffusion coefficient for NaSi [unknown] CaAl exchange, Dmax sim10-20 centimeters squared per second for temperatures in the range 1250° to 1000°C. Millimeter-sized grains cannot be homogenized in all geologic time; hence reactive equilibrium crystallization of plagioclase from the melt does not occur in dry systems.

Submitted on February 21, 1984
Accepted on May 3, 1984


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Cyclicity in the Main and Upper Zones of the Bushveld Complex, South Africa: Crystallization from a Zoned Magma Sheet.
C. TEGNER, R. G. CAWTHORN, and F. J. KRUGER (2006)
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Origin of the Pegmatitic Pyroxenite in the Merensky Unit, Bushveld Complex, South Africa.
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J. Petrology 47, 1509-1530
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Experimental Petrology of the Kiglapait Intrusion: Cotectic Trace for the Lower Zone at 5 kbar in Graphite.
S. A. MORSE, J. B. BRADY, and B. A. SPORLEDER (2004)
J. Petrology 45, 2225-2259
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Magma Emplacement and Remobilization Timescales Beneath Montserrat: Insights from Sr and Ba Zonation in Plagioclase Phenocrysts.
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400 my of Basic Magmatism in a Single Lithospheric Block during Cratonization: Ion Microprobe Study of Plagioclase Megacrysts in Mafic Rocks from Transbaikalia, Russia.
I. N. Bindeman, I. N. Bindeman, A. M. Davis, and S. M. Wickham (1999)
J. Petrology 40, 807-830
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Science. ISSN 0036-8075 (print), 1095-9203 (online)