Fletcher, R. 2000.   Three Examples of Metamorphic Differentiation. In: (Ed.) Mark Jessell, and Janos Urai, Stress, Structure and Strain: a volume in honour of Win D. Means, Journal of the Virtual Explorer, Electronic Edition, ISSN 1441-8142, volume 2, paper 7, doi:10.3809/jvirtex.2000.00010

Three Examples of Metamorphic Differentiation

Raymond C. Fletcher

Department of Geological Sciences

University of Colorado at Boulder

Boulder, CO 80309-0399


Metamorphic differentiation or segregation of dissolved and reprecipitated minerals in the filling of a boudin gap, in the growth of new grains in a pressure shadow around a cylindrical inclusion, and in limb-to-hinge differentiation in folding may all be expressed in similar terms. A ratio of a rate of deformation arising from dissolution, transport, and precipitation to that due to viscous creep is expressible as the product of two dimensionless quantities. One, the Bayly Number, B, incorporates the viscosity, quantities describing the kinetics of dissolution and precipitation and diffusional transport, and a characteristic length scale. Large B implies significant differentiation during some phase of the structural evolution. A second quantity incorporates dimensions of the current structure, and may change markedly with its evolution.

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Keywords: Metamorphic Differentiation

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