Once all the gibbsite is consumed, the fluid composition then evolves towards the NE again. At the smectite - kaolinite boundary, both H 4 SiO 4 and Na are used to form smectite. The fluid composition tracks along the kaolinite - smectite boundary until all the kaolinite is gone. Example 2 . The above scenario is for a closed system.
Soils are open systems.
The faster the flow rate, the shorter the contact time of solution with the primary minerals. The diagram below shows the effect of rain fall versus the percentage of clays formed in soils. 3 Daniel Springs metagabbro weathering. The class project on the Danial Springs meta-gabbro is simialr to the work of Mike Velbel. There are three basic types of rate laws that are used to describe the kinetics of a reaction.