01:460:101 Lecture Notes - Lecture 4: Mudrock, Dunham Classification, Calcite
28 Sep 2016
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Document Summary
Rock cycle: rock in mantle magma igneous rock sediment sedimentary. Sedimentary rocks: produced from weathering products of pre-existing rocks or accumulated biological matter, detrital rocks: from rock fragments, chemical rocks: from precipitation of dissolved ions, organic rocks: from accumulation of biological debris, relationships to earth"s systems, atmosphere. Most sediments produced by weathering in the air: hydrosphere. Water is a primary agent in sediment production, transportation, deposition, cementation, and formation of sedimentary rocks: biosphere. Biological activity key to formation of sedimentary rocks. Fossils in rocks show history of life and resources are also found in these rocks: classifications, boulder: > 256 mm, cobble: 64-256 mm. Silt: 1/256 to 1/16 mm: clay: < 1/256 mm, four steps to make sedimentary rock, weathering and breakdown of existing rock and transport (moving of sediment from its source) Rounding of particles occurs due to abrasion. Sorting occurs as sediment is sorted according to grain size.
