Geochemistry at the surface of the earth is dominated by two
somewhat antagonistic forces: chemical reactions which attempt to
attain a steady state (equilibrium) and geological movement of
materials in time and space which changes the parameters that
control chemical equilibrium. Another aspect that is extremely
important to earth surface geochemistry is the effect of plants on
the chemical and physical stability of materials (soils). Plant
systems in fact work against the normal chemical changes (loss of
silica, potassium, etc.) and the normal physical changes
(stabilizing fine grained materials (clays) in the surface zones to
avoid erosion). Biological effects are clearly seen in redox
effects in the various parts of the earth surface movement cycle;
soil formation, stream transport, sedimentation. This book attempts
to outline these different parameters and their interactions as
they affect earth surface geochemsitry in order to give a better
understanding of movement and accumulation of elements at the
surface of the earth.
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