1 / 9

Lab 6

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

carol
Download Presentation

Lab 6

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Lab 6 Sedimentary, my dear Watson

  2. Weather and Sediment • Chemical weathering – chemical decomposition or dissolution of a material (into a solution). • Physical weathering – physical decomposition of a material (into grains or clasts).

  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?

More Related