Rocks . Essential Points. Sedimentary rocks tell us about earth’s past surface environment Igneous and Metamorphic rocks tell us about earth’s internal processes. What Rocks Mean. Sedimentary Rocks Record of the earth's ancient surface environments and of life.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Large Grain Size ---> Slow Cooling
How Much Silica? (account for Si)
Silica means more silica networks
} Transport, Reworking
Biochemical Sedimentary Rocks
Sedimentary rocks made of silt- and clay-sized particles are collectively called mudrocks, and are the most abundant sedimentary rocks.
Evaporites -Water Soluble
Alteration After Deposition
Mineral Makeup of Clastic Rocks
Locale for Petroleum
Markers for Tilting or Fracturing of Crust
Changes in Rock Composition or Texture
Due to Heat, Pressure and Action of Fluids
Pressure: Weight of Overlying Rocks
Minerals React to Form New Minerals
Minerals Change Form
New Materials Are Added (Metasomatism)
Reactions Can't Reverse Because Ingredients Lost
Reactions "Freeze" at Low Temperatures
Sometimes it Does Happen if Fluids Present
Degree to Which the Rock Has Changed
Originally far below the surface and got to the surface by uplift and erosion.
Low grade Metamorphism
High grade Metamorphism