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Lab 6 Sedimentary, my dear Watson. Weather and Sediment Physical weathering – physical decomposition of a material (into grains or clasts). Chemical weathering.

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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:

1 Lab 6 Sedimentary, my dear Watson

2 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).

3 Weather and Sediment Sediment – loose grains/chemical residues or rocks, minerals, plants & animals Erosion – transport of weathered sediments

4 Sedimentary Rocks Form when: –Sediments collect, compact & harden: Lithification –Mineral crystals precipitate from an aqueous solution Sedimentary rocks are classified by: –Composition –Texture

5 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

6 Sedimentary Textures Grain size: –Deposits Gravel size > sand sized > silt sized > clay sized –Precipitates Crystalline > microcrystalline

7 Sedimentary Textures Grain shape: –Describes the smoothness of the edges of grains –Well rounded to angular

8 Sedimentary Textures Grain arrangement: –Describes sorting of the grains –Poorly sorted, moderately sorted, well sorted See page 111 in lab manual

9 Depositional environment?? Detrital? Precipitates? Biochemical/bioclasts?


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