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NDSU Geosciences Petrology 422/622
Study Questions for Exam 3
Since the last exam, we have worked through parts of Winter, Part II - Metamorphic Petrology
We have used class handouts and referred to the following portions of the Winter text:
Ch. 21, 22, table 23-1, Ch. 24, 25, Ch. 26.9, Ch. 26.11, Ch. 27.1, Fig. 28-2, Ch. 29.1. (note: not necessarily an exhaustive list)
Below are some sample questions and topics.
We have covered types of metamorphism and their classification, and stable mineral assemblages including:
- late stage magmatic alteration
- metamorphic facies and grades
- isograds
- compatibility diagrams such as AFM and ACF diagrams
- metamorphism of siliceous dolostones and of pelites
- the concept of petrogenetic grids
- thermodynamics for calculating reaction slopes in P-T space
- paired metamorphic belts
- origin of plate tectonics and continental crust
Discuss (perhaps with the aid of supporting diagrams):
- What are the five types of metamorphism that Winter recognizes, and briefly describe each.
- Appropriate mineral assemblages at different P - T conditions for different rock types.
- What minerals would you expect to find in a metamorphosed mafic rock at high P and low T? (see Table 25-1 and handouts)
- The superposition of AFC or AFM diagrams onto P-T diagrams to make a "petrogenetic grid."
- The parent rocks of: phyllite; greenstone; tremolite-diopside marble
- Why some minerals might not be shown in metamorphic AFM projections, but are implied to be present?
- The protolith (basaltic, argillaceous, or calcareous) and metamorphic facies for the following
mineral assemblages:
a. chlorite, actinolite, epidote, albite
b. calcite, plagioclase, diopside
c. glaucophane, lawsonite, pumpellyite, chlorite, jadeite
d. garnet, orthoclase, labradorite, quartz, kyanite (or sillimanite)
e. calcite, wollastonite, grossular
f. chlorite, muscovite, albite, quartz
- Metamorphic/tectonic processes which produce outcrops of blueschist and ophiolite at the earth's surface.
- Metamorphic / tectonic processes which operate in subduction zones
Remember to review your fellow students' term project presentations and be prepared to discuss!
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