Geol 1045Name____________________________Homework Assignment 2 – The Language of Rocks(1/25/07)Objective: To hone your “language” skills about the three main types of rocksInstructions: Answer the questions below for each of the three parts. Turn in your assignment via email or in class by next Thursday (2/1/07)Part I – Igneous RocksDescribe the magma composition type, environment of emplacement, basic texture and two common minerals that occur in each of the four main types of igneous rocks (5 pts)Rock Magma Type Environment Texture 2 MineralsBasalt _____________ ________________ _____________ ___________ ___________Granite _____________ ________________ _____________ ___________ ___________Gabbro _____________ ________________ _____________ ___________ ___________Rhyolite _____________ ________________ _____________ ___________ ___________Part II - Sedimentary RocksFor each of the sedimentary rocks below, indicate whether it is a clastic or chemical rock type (circle one). If it is clastic, rank its sorting (well, moderate, poor) and compositional maturity (mature, immature). For all rock types, indicate a possible depositional environment. (7 pts). Sediment Type Clastic Rx AttributesRock Clastic or Chemical Sorting Maturity Possible Depositional Env. Till Cl Ch _______ ________ ____________________________Shale Cl Ch _______ ________ ____________________________ Limestone Cl Ch _______ ________ ____________________________ Quartz Sandstone Cl Ch _______ ________ ____________________________ Iron Formation Cl Ch _______ ________ ____________________________ Graywacke Cl Ch _______ ________ ____________________________ Conglomerate Cl Ch _______ ________ ____________________________ Part III - Metamorphic RocksFor each of the metamorphic rocks below, indicate the grade of its metamorphism (high or low) and a possible protolith (source rock) (4 pts)Rock Grade ProtolithAmphibolite _______________ ________________________________Metagraywacke _______________ _________________________________Gneiss _______________ _________________________________Schist _______________ _________________________________Marble _______________ _________________________________Greenstone _______________ _________________________________Quartzite _______________