Abstract
In this article we present the first data on the anisotropy of magnetic susceptibility (AMS) for the rocks of the Early Carboniferous Nepluyevka polyphase pluton, which is situated in the southern part of the East Urals megazone. We consider the properties of magnetic mineralogy of all phases of the batholith, and show that the leading role in determining the magnetic properties of the rocks belongs to an isotropic grain population of MD magnetite and multiple populations of SD magnetite, which are the chief contributors to AMS. We consider the characteristic parameters of AMS for each phase, and show that the AMS is magmatic (non-deformational) in nature. An emplacement mechanism of “magmatic duplex” developing in a kinematic setting of sinistral transtension is proposed for the batholith, based on the analysis of the characteristic magnetic fabrics.
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