Abstract
The accumulated chemical data from high grade terranes indicate that granulites are commonly depleted in sialic and LIL components with respect to amphibolites. We report uniquely field controlled data from a major West Greenland shear zone in which the same chemical differences have developed between deformed and undeformed quartzo-feld-spathic gneisses: it appears that K, Si, Rb and water have been added during deformation while Fe, Mg, Ca, Ti, and Sr were removed. We suggest a model of chemical mobility in which the mechanism is bidirectional, vertical diffusion through a fluid phase. The ultimate driving gradient appears to be the temperature gradient.
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References
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© 1989 Kluwer Academic Publishers
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Sørensen, K., Winter, J.D. (1989). Deformation and Mass Transport in the Nordre Strømfjord Shear Zone, Central West Greenland. In: Bridgwater, D. (eds) Fluid Movements — Element Transport and the Composition of the Deep Crust. NATO ASI Series, vol 281. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0991-5_16
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DOI: https://doi.org/10.1007/978-94-009-0991-5_16
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6935-9
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