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Oscillatory zoning in plagioclase feldspar
Science (New York, N.Y.)
|July 11, 1980
Summary
A mathematical model explains oscillatory zoning in plagioclase feldspar. Crystal growth rate and melt composition significantly influence this zoning phenomenon.
Area of Science:
- Geochemistry
- Crystallography
- Mathematical Modeling
Background:
- Oscillatory zoning in plagioclase feldspar is a common feature in igneous rocks.
- Understanding the mechanisms driving this zoning is crucial for interpreting geological histories.
Purpose of the Study:
- To quantitatively describe oscillatory zoning in plagioclase feldspar using a kinetic mathematical model.
- To investigate the influence of crystal growth rate and melt composition on zoning patterns.
Main Methods:
- Development of a kinetic mathematical model for crystal growth from a melt.
- Explicit consideration of the functional dependence of growth rate on melt and crystal surface composition.
- Inclusion of material transport within the melt.
Main Results:
- The model successfully describes the phenomenon of oscillatory zoning.
- Oscillatory zoning develops across a wide range of functional dependencies.
- The initial melt composition critically affects the resulting zoning patterns.
Conclusions:
- Kinetic modeling provides a quantitative framework for understanding plagioclase feldspar oscillatory zoning.
- Growth rate and melt composition are key factors controlling zoning development.
- The model highlights the sensitivity of zoning to initial geological conditions.
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