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Lecture 10

GEOG 1120 Lecture 10: META Rocks

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GEOG 1120
John Martin

Lecture 10: META Rocks I. Basics: - Old component of continental crust called "Craton". => Craton - AKA Shield, are continents that have been stable for billions of years. - META rocks contain mineral resources. - Used for building materials such as statues. - META rocks is the result from pre-existing rock. - META rocks are altered/changed rocks. - Heat and pressure creates META rocks. - Are different from their rock parents (both chemically and physically different). - Occurs deep inside the Earth. - Don't need high or low temperature. - META rocks are the "Middle Child" - Mid. Temperature and Mid. Pressure. => SED rocks - shallow and low temperature. => Igneous rocks - need high pressure and high temperature. II. Pressure - META rocks need to be put under pressure. - Pressure controls primarily META rocks. - Two broad types of pressure exerted on rocks: 1. Confining Stress 2. Directed or Compression Stress => Found in Convergent Plate Boundary. - Different from the Parent: => Higher density and minerals altered. 1. Non-Foliated - No orientation => Formed around igneous intrusion. => High Temperature and low pressure. => Ex: Quartzite, Marble, Hornfels. => No layered or banded appearance. 2. Foliated - Have layered or banded appearance from the exposure to heat. => Layers are due to the pressure squeezing them flat. => Directed Minerals that don't melt will elongate and rotate. => Confining has high density and minerals are
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