GEOL-1010 Lecture Notes - Lecture 6: Metamorphic Rock, Geothermal Gradient, Structural Geology
5 Feb 2018
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Exposure: how do metamorphic rocks get back to the surface, fault- large crack that opens up through the layers and rocks are forced upward along the fault line. Rocks and environments: q: what metamorphic rock forms, a: parent rock"s composition is key, example: two different rocks can be exposed to the exact same temperature increase and end with two different metamorphic rocks. Metamorphic change: metamorphic grade: how much did the temperature and pressure increase, low, intermediate, and high. Intermediate= changes are a little more significant: low= haven"t caused much of a change, high= big temperature and pressure change. Rock is making its way back to the surface: changes within minerals can record p-t changes, mapping out elements within the crystal (slide 25, crystal has been mapped for its calcium concentration. Types of metamorphic rocks: foliated metamorphic rocks: fancy science word that means layers. Confining pressure: hornfels: contains lots of hormite, quartzite: contains lots of quartz, marble: contains lots of calcite.
