Weathering and the formation    of Sedimentary Rocks

Weathering and the formation of Sedimentary Rocks PowerPoint PPT Presentation


  • 244 Views
  • Uploaded on
  • Presentation posted in: General

Why do rocks and minerals weather?. Because they are out of equilibrium with the conditions under which they formedMinerals in granite originally formed at high temperatures and at considerable depth, typically >700C and 5-15km depth All silicate minerals except quartz are unstable at

Download Presentation

Weathering and the formation of Sedimentary Rocks

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


6. Leads to disintegration of the bedrock into smaller, angular, but chemically identical fragments Results in an increase in the surface area of rock exposed for chemical weathering to act upon

8. Mechanical Processes Freeze-Thaw Insolation - Exfoliation Insolation - Granular Disintegration Salt Crystal Growth Dilatation Biological Hydration

9. Freeze Thaw Activity

12. The Effects of Freeze-Thaw

18. Salt Crystal Growth

19. Dilatation/Pressure Release

20. Dilatation/Pressure Release

21. Biological Activity

23. Hydration

24. Leads to the decomposition of the bedrock Only quartz is unreactive and not affected Results in the formation of clay minerals from the breakdown of silicate minerals such as feldspars, mica, augite and olivine Ions are also released into solution

25. Chemical Processes Hydrolysis Carbonation Solution Oxidation Reduction Biological

26. Hydrolysis

28. Residual quartz grains following kaolinisation of granite on Carn Brea

31. Carbonation

34. Solution

35. Oxidation

38. Reduction

39. Biological-Chelation

40. Biological Weathering

41. Biological Weathering

  • Login