Geo 102 Lecture 14 Outline of Last Lecture I Geologic time Outline of Current Lecture II Minerals to Rocks III Rock Types IV Types of Sedimentary rocks V Weathering Current Lecture Minerals to Rocks Minerals form rocks o Some are simple with one mineral o Others are complex with many minerals Rock Types Igneous o From magma or lava Metamorphic o Altered through and or pressure Sedimentary o Reformed bits of other rocks broken down or from a solution Rocks linked to tectonics So why the differences Time Energy Distance Minerals Transitions These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Parent rock to sediment sediment to sedimentary rock Types of Sedimentary Rocks Clastic a sedimentary rock made from pieces of pre existing rock that weathered and eroded o Also called detrital Chemical sedimentary rock derived from minerals that precipitate from a fluid often water Life cycle of a clastic rock Let s assume we begin with granite o Quartz o Feldspar o Mica How does that fit with sedimentary rocks we know o Conglomerate o Sandstone siltstone o Shale Weathering Rocks break down according to their environment o The wetter the faster it breaks down All rain is acid rain o Weak carbonic acid o This is key to the carbon cycle and climate Some minerals break down faster o Quartz is tough o Feldspar is less tough Sometimes the process leads to new minerals o Clays form from feldspar Soil is a weathering product Rock weathered in situ is called saprolite
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