**A
Theoretical Study of Orientational Magnetization Process of Sedimentary Rocks
in Cluster Model Approximation**

The
cluster model of sedimentary magnetism * J _{ro}(H)* field
dependency was practically not studied in the cluster theory until now. In an
approximation, similar to that of paramagnetic gas, "experimentally
found" dependency of Langevin type was accepted
as a basic type:

,

where - *J _{ro}*

However, a number of experiments with artificial sediments
deposited in known laboratory conditions with the magnetic grains in known
magnetic states has shown that the interaction field
values calculated from experimental field dependencies in Langevin
approximation are about one order of magnitude less than those resulting from
the direct calculation of possible inter-grain interaction fields in clusters.
In this connection, the direct calculations of *J _{ro}*
field dependences have been carried out by the two techniques (static and
dynamic) within the framework of cluster model. Calculated

,

than by a Langevin function. A comparison of experimental data for artificial sediments with the results of Langevine and hyperbolic tangent approximations, respectively, has shown that the latter describes much better real "magnetic" conditions in clusters.

*V.A. Shashkanov,
A.A. Kosterov,
P.V.Dubrovin*

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