The Magmatic Rheological Properties of Podiform Chromitites in Zunhua
遵化豆荚状铬铁矿岩浆流变学性质

The statistical analysis of shapes and sizes of 250 nodular chromitites from Zunhua shows that the formation of both round and oval pods were accompanied by the ascent of host magma, and such a phenomenon mainly resulted from the viscous friction between the surface of the chromitite pods and the host magma. The viscous friction force and the duration of its action on chromitite pods depended on the viscosity of host magma, the settling rate of pods relative to the size of pods and the ascent rate of magma. Therefore, all of these properties affected the ovality of chromitite pods. Thus, the deformation of chromitite pods can be modeled by the physical process of the interaction between pods and their host magma. As a result, the real ascent rate of the host magma can be determined on the basis of the field data of the pod deformation degree.