English Science Geology Soil

DL

The original source:

https://books.google.com.eg/books?i­d=YKkw-Bre-kAC&pg=PA136&lpg=PA136&d­q=%22DL4%22+formation++illite+compo­nent&source=bl&ots=69lrc6zIPc&sig=I­5qWrG1JOr1NY-AjPgfdxnZzrj8&hl=ar&sa­=X&ved=0ahUKEwiL5JH7o-zMAhWGJMAKHUN­2BLwQ6AEIGzAA#v=onepage&q=DL4&f=fal­se

https://books.google.com.eg/books?i­d=YKkw-Bre-kAC&pg=PA29&lpg=PA29&dq=­%22DL%22+SR+saturation&source=bl&ot­s=69lrc6AEQc&sig=R6YS3UJSeR8r5ug6m4­6sg3NnO3Q&hl=ar&sa=X&ved=0ahUKEwjy5­omepuzMAhUCLMAKHZKHDVQQ6AEIIzAB#v=o­nepage&q=%22DL%22%20SR%20saturation­&f=false

Context
The most important effect in the first example (DL4) is the formation of a stronger illite component, especially the 10 A well ordered illite of rather narrow peak width (WCI).

This effect is important in that it indicates that portions of the mixed layer, illite - smectites material, has large zones of high charge layers which all become anhydrous upon potassium saturation.

This effect is visible in cases where illite is initially absent (DL 4), or almost so, and where it is strongly present (DL 173).