Magnetic fabric of the Elberton granite, northeast Georgia.

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The anisotropy of magnetic susceptibility of samples from 21 sites within the granitic Elberton pluton, located in NE Georgia, has been used to determine a possible tectonic rotation, source, and flow direction for granite emplacement. The data indicate that the granitic magma may have been initially emplaced in the NE and S central portions of the body and then flowed as a result of plastic deformation to the NE and SW. Estimates of tectonic rotation are based on field evidence and on the assumption that the magnetic fabric within the body was initially horizontal. Present orientation of this fabric, then, indicates a rotation about a N-NE strike down to the SE by possibly as much as 35o. A zone of high bulk susceptibility within the body, indicative of an excess in iron content, is closely associated with areas of pink discoloration of the granite. We suggest that the pink discoloration is the result of low-temperature oxidation of magnetite to hematite in the feldspars.-Authors

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Journal of Geophysical Research

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