Presentation on theme: "Lab 6 Sedimentary, my dear Watson. Weather and Sediment Physical weathering – physical decomposition of a material (into grains or clasts). Chemical weathering."— Presentation transcript:
Lab 6 Sedimentary, my dear Watson
Weather and Sediment Physical weathering – physical decomposition of a material (into grains or clasts). Chemical weathering – chemical decomposition or dissolution of a material (into a solution).
Weather and Sediment Sediment – loose grains/chemical residues or rocks, minerals, plants & animals Erosion – transport of weathered sediments
Sedimentary Rocks Form when: –Sediments collect, compact & harden: Lithification –Mineral crystals precipitate from an aqueous solution Sedimentary rocks are classified by: –Composition –Texture
Sedimentary Composition Detrital (siliciclastic) – –Rock or mineral fragments Quartz, feldspar, clay, or lithic fragments Chemical – –Precipitated from aqueous solution Calcite, dolomite, halite, gypsum, iron bearing minerals, chert Biochemical (bioclasts) – –Grains are remains of organisms See page 116 in lab manual