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Biochemical Sedimentary Rocks Most Chemical Sedimentary Rocks have a significant biological component, making a sharp distinction impractical
Chemical Sediments Evaporites -Water Soluble Halite Gypsum Calcite Precipitates Example: Ca(sol'n) + SO 4 (Sol'n) = CaSO 4 Gypsum Limestone Iron Formations Alteration After Deposition Dolomite Biogenic Sediments Limestone - Shells, Reefs, Etc. Organic Remains Coal Petroleum
Coal Seams, Utah
Coal Delta, continental environments Carbonized Woody Material Often fossilized trees, leaves present
Plant Fragments Are Often Visible in Coal
Petroleum A hydrocarbon molecule What organisms make these? Answer: None
Petroleum Lots of organisms make these, however Fatty Acids Probable source: Marine plankton
Gas Hydrates Hydrocarbons trapped in cage of water molecules Freeze above 0 C under moderate pressure Solid gas hydrates occur in marine sediments (“yellow ice”) Potentially huge energy resource Possible role in climate change?
Sedimentary Rocks Deposited on or Near Surface of Earth by Mechanical or Chemical Processes.
Sedimentary Rocks Deposited on or Near Surface of Earth by Mechanical or Chemical Processes
Rock Cycle. Sedimentary Rocks Fossil source rock Made from weathered and eroded igneous and metamorphic rocks Indicate past climates/environments Petroleum,
Energy. Energy Use, California, 1972 Energy Use, California, 1979.
U Chemical sedimentary rocks v derived from material carried in solution to lakes/seas v evaporation and precipitation from solution to form “chemical.
Sedimentary Rocks. Sedimentary Rocks are #1 Earth’s crust was made of IGNEOUS rocks But 75% of the rocks on the Earth’s crust are SEDIMENTARY! Why?
Sedimentary Rocks Chapter 6. What Are Sediments? Loose particulate material In order of decreasing size.
Earth Materials Sedimentary Rocks. I. Sedimentary rocks are formed from pieces of other rock; from organic material; or from chemicals out of solution.
Sedimentary Rocks. Made from sediments or rock material that has been broken down in some way. Sedimentary rocks are usually formed in a watery environment.
Chemical & Organic Sedimentary Rocks (Names based primarily on composition) Basic Rock Name Limestone Dolostone Chert Rock Salt Rock Gypsum Peat or Coal.
SEDIMENTARY ROCK Mod E. U.3 L.3. Definition Rock that forms when sediments are compacted and cemented together.
Sedimentary Rocks Sedimentary rocks are products of mechanical and chemical weathering of preexisting rocks They account for about 5% (by volume) of Earth’s.
Sedimentary Rocks Chapter 3 Section 3. Sedimentary sedimentum Latin for ‘settling’ Rock formed from compressed or cemented layers (DEPOSITS) of sediment.
Sedimentary Rocks Rocks from clastic materials. What is a Sedimentary Rock? Sedimentary rocks are products of mechanical and chemical weathering They.
A rock is a naturally occurring solid mixture of one or more minerals, or organic matter Rocks are classified by how they are formed, their composition,
Sedimentary Rocks Sandstone.
Lesson 6: Sedimentary Rocks. Sedimentary rocks are formed through the process of sedimentation. Sedimentation is the process by which minerals and organic.
Sedimentary Rocks. Formation of Sedimentary Rocks Sedimentary means settling Form when solids settle out of fluids like water or air.
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