Changes on composition during growth lead to Zoning

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Changes on composition during growth lead to
Zoning
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Zoning in plagioclase found in dacite porphyry
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Phase diagram
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grain getting started on a grain boundary TEM
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hydrostatic transformation at high T
100 mm
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Two transformation mechanisms
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0.25 mm
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High degree optical
100 mm
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Some solid solutions unmix at lower temperature,
this results in precipitation of a new mineral
at lower temp. Called Exsolution
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Another example Of exsolution, this time
in Amphibole. This is a thin Section picture
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Dislocations around an indentation Imaged in
TEM
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Olivine grain boundary in synthetic partially
molten lherzolite (Hiraga et al. 2002a).
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HRTEM of coherent twin in molybdenumMicroscope
JEOL 4000EX (CEA/DRFMC Grenoble)Author TVYear
1998
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Cyclic twins
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