Rocks Class Notes: Mrs. Cirillo

Rocks: General All rocks are classified on the basis of formation There are three categories: Igneous, Sedimentary, and Metamorphic Minerals make up rocks All rock info can be found in the ESRT p6,7

Igneous Rocks Are classified on basis of__________and ___________composition Form by___________and __________ of molten rock or__________/______ Make up Earth’s crust- oceanic__________ continental____________

2 main categories: intrusive/extrusive Cooling rate determines crystal size- short cooing time=_______________, long cooling time=_______________ see ESRT page 6 d

Draw a line in center of first section as demonstrated Which minerals are found along this line (A)_______________________________________ __________________________________________ ________________________ Is the rock mafic or felsic?_____________ Light or dark?________ High or low density?___ List the % of each mineral: How to use:

Potassium feldspar_________ Quartz___________ Biotite__________ Plagioclase feldspar___________ Amphibole_______________

If the rock is non-vesicular, coarse grained, name the rock?______________ If the rock is vesicular, noncrystalline, name the rock?_______________ Now repeat on other side as demonstrated...

List the % for each mineral: plagioclase feldspar_________ biotite____________ pyroxene__________ amphibole_________ olivine__________

Name the rock-fine grained, extrusive (using line B)_____________ A rock is plutonic, coarse grained, and non-vesicular containing 75% olivine_____________ A rock is volcanic, fine grained, and contains 15% potassium feldspar, 42% quartz, and 30% plagioclase feldspar___________

Sedimentary Rocks Classified upon basis of formation Composed of WEATHERED remains of other rocks Form by compression and compaction of sediments

Groups- Fragmental or clastic:__________________________ _______________________________ Organic:_________________________ _______________________________ Chemically(evaporites)_____________ _______________________________

Will find fossils remains in these rocks!!!

See page 6 ESRT: Relationship of transported Particle Size to Water Velocity…. How is this table used in conjunction with the sedimentary rock table???

See page 7 ESRT: Scheme for Sedimentary Rock ID Classify Shale:__________________________ _______________________________ Classify Limestone:______________________ ______________________________

Name the rock: a clastic, fine grained (0.006cm) rock____________ Name the rock: a bioclastic, coarse grained rock that reacts with HCL___________________________

How fast does a stream have to be traveling to transport a sediment 0.2cm, and what type of sediment is this? How fast does a stream have to be traveling to transport a 27cm boulder? What type of relationship is shown on the graph? What process is this? Can you infer how this may relate to producing various types of rock?

What is the map symbol for rock salt?________________ Why do you think they choose that symbol?

Metamorphic Rocks Form when sedimentary or igneous rocks undergo intense heat and/or pressure Have undergone significant changes deep within the earth Forms directly from another rock!!! Never melts(if melts what type of rock would it be?_________________)

Classified on the basis of formation Types of metamorphism: regional_____________________ contact______________________

Foliation: Banding Distortion

Would you find fossils in this rock type?

Lets start with shale….. Shale ryholite Rhyolite schist Granite gneiss

Using page 7, Scheme for Metamorphic Rock ID answer … Classify Quartzite: Classify Marble: Which rock is the result of intense metamorphism? Give an example of a fine grained foliated rock?