1 / 79

SOIL FORMATION Chapter 2

SOIL FORMATION Chapter 2. Processes of Soil Formation. Processes of Soil Formation. Processes of Soil Formation. Processes of Soil Formation. Processes of Soil Formation. Processes of Soil Formation. Processes of Soil Formation. →. →. Rock. Rock. Rock. Rock. Rock. Rock. Rock.

cooley
Download Presentation

SOIL FORMATION Chapter 2

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. SOIL FORMATION Chapter 2

  2. Processes of Soil Formation

  3. Processes of Soil Formation

  4. Processes of Soil Formation

  5. Processes of Soil Formation

  6. Processes of Soil Formation

  7. Processes of Soil Formation

  8. Processes of Soil Formation

  9. → →

  10. Rock

  11. Rock

  12. Rock

  13. Rock

  14. Rock

  15. Rock

  16. Rock 2KAlSi3O8 + 13H2O → Al2O3 + 6H4SiO4 + 2K+ + 2OH-

  17. Rock → → Fe3+

  18. Rock It fizzes because CaCO3 + 2HCl → Ca2+ + 2Cl- + H2CO3 H2CO3 → H2O + CO2 ↑

  19. Factors of Soil Formation

  20. Factors of Soil Formation, Parent Material These are the types of transported parent material. Residual parent material is residual, i.e., weathered rock. Organic soils don’t fit into this dichotomy.

  21. Factors of Soil Formation, Parent Material

  22. Factors of Soil Formation, Parent Material As the cementing agent (carbonate) dissolves, limestone residue can be any size particulate, from sand to clay. Sandstone give sandy soils but how deep these are depends on how fast the cementing agent dissolves. Shale gives clayey soils.

  23. Factors of Soil Formation, Parent Material Soils formed in colluvial parent material are found in landscapes like to right.

  24. Factors of Soil Formation, Parent Material These are the three types of alluvial deposits.

  25. Factors of Soil Formation, Parent Material These not all that common.

  26. Factors of Soil Formation, Parent Material Common and often important in agriculture.

  27. Factors of Soil Formation, Parent Material Deposition is greatest near the bank leading to highest elevation. Furthermore, this area of deposition is comparatively high in sand + silt. Thus, since the coarser particles are deposited quickly, deposition from the flood water further away is low in sand + silt and high in clay.

  28. Factors of Soil Formation, Parent Material A laterally compressed cross section of the Mississippi River natural levee. Notice any familiar names to the soils? The name comes from some place or geographic feature nearby where the soil was first described.

  29. Factors of Soil Formation, Parent Material Another depiction of the Mississippi River natural levee. The course has followed a low position in the landscape, and river sediments have been deposited in the channel and outside it, the latter creating the levee.

  30. Factors of Soil Formation, Parent Material Apparent old levee, thus earlier course.

  31. Factors of Soil Formation, Parent Material

  32. Factors of Soil Formation, Parent Material These old materials vary in composition depending on their ancient source. Due to uplift or sea level drop, these became exposed and have undergone pedogensis. As with alluvial parent materials (floodplain and deltaic deposits), there are a lot of soils in Louisiana that have formed in marine sediments.

  33. Obviously, no.

  34. Factors of Soil Formation, Parent Material Partially melted in summer, giving sediment deposited at leading edge or further away. See various topographic features in a glaciated landscape.

  35. Factors of Soil Formation, Parent Material None of this in La., however, there are soils in eolian parent material that came from glacial melt. See next slide.

  36. Factors of Soil Formation, Parent Material This figure shows loess only to east of river, however, there is loess to the west, just not as much. Also, not nearly as deep in Baton Rouge as further north, like Natchez.

  37. Well, not necessarily because there are deposits that are more sandy.

More Related