Metamorphic zonal sequences and equilibrium

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Presentation transcript:

Metamorphic zonal sequences and equilibrium Lecture 3

3D mineral structures http://rruff.geo.arizona.edu/AMS/amcsd.php Type in a mineral name and search Go to View JMOL 3-D Structure (permalink)

Andalusite

Sillimanite

Kyanite

Figure 21-8. Regional metamorphic map of the Scottish Highlands, showing the zones of minerals that develop with increasing metamorphic grade. From Gillen (1982) Metamorphic Geology. An Introduction to Tectonic and Metamorphic Processes. George Allen & Unwin. London.

Metamorphism of Calcareous Rocks Figure 29-9. Map of isograds in the pelitic Waterville and calcareous Vassalboro formations of south-central Maine. After Ferry (1983) J. Petrol., 24, 343-376.

Post-kinematic: Si is identical to and continuous with Se Pre-kinematic: Porphyroblasts are post-S2. Si is inherited from an earlier deformation. Se is compressed about the porphyroblast in (c) and a pressure shadow develops. Syn-kinematic: Rotational porphyroblasts in which Si is continuous with Se suggesting that deformation did not outlast porphyroblast growth. From Yardley (1989) An Introduction to Metamorphic Petrology. Longman.

Yardley, Barber and Gray 1987