GEOL 1001 Chapter : Sedimentary Rocks
Document Summary
0mm thick to km thick: types of weathering, physical weathering. Wedging force open cracks: root wedging roots open cracks, frost wedging water in cracks freezes and expands cracks. Thermal expansion: rocks get hot expand, forest fire, desert heat. Animal interaction: burrowing creatures (earthworm, gopher, humans, chemical weathering. Dissolution minerals dissolve in water (happens because water is a polar molecule and capable of breaking ionic bonds) Hydration water added to mineral (changing chemistry) (mineral > clay) Processes dissolution, plucking, falling: transportation path sediment moves (air, water, ice, gravity) Ability to move sediment depends on viscosity and velocity. Ice can move large or small objects. Water depends on velocity (the bigger the faster) Wind (air) sand and dust: deposition sediment settles out of solution. Solution (water, air, ice) loses velocity or if ice melts: lithification turning into rock. Compaction bury, pressure pushes out air/water. Cementation minerals that precipitate (quartz, feldspar, hematite (feo)) that hold the rock together: classifying clastic rocks.
