GEOSCI 100 Lecture Notes - Lecture 9: Deep Sea, Silicate Minerals, Connate Fluids
21 Mar 2018
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**6 igneous rocks to remember:*: texture: small crystals (extrusive) vs. big crystals (intrusive, composition: mafic vs. intermediate vs. felsic. *lithification - the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Granite composed of quartz and feldspar minerals physical weathering breaks apart into. Quartz physical weathering erosion (large particles) transporting (sand-size particles) silt-size particles creates sandstone and siltstone. Feldspar physical and chemical weathering add carbonic acid + water creates clay minerals (even smaller than silt) and positive charged ions. Grain shape: larger, more angular or smaller, more rounded. Graded bed: large grains on the bottom, small grains on the top. Decreasing speed of water going from bottom to top. Cross beds: sand dunes create them - indicates there used to be a giant desert. Which way the wind is blowing determines what it looks like.
