Abstract
Partial melting and deformation-assisted melt segregation, resulting in migmatization, has occurred in a shallow-level gabbroic metamorphic contact aureole, in the roots of a volcanic edifice. Melt segregated into small tension gashes and larger conjugate veins leading to unusual “zebra” and “striped” structures. In areas preserved from deformation, melt did not segregate and froze as small leucocratic pods. Geometry of the network of leucosome veins allows reconstruction of a transtensional stress field at time of melting; which can be related to large-scale regional tectonic activity. Mass transfer processes resulting in the stromatic structures involved small-scale melt segregation, input of allochtonous melts and pervasive circulation of high-temperature fluids. Deformation triggered and enhanced these processes by opening fractures into which the melts could migrate, and by promoting the percolation of fluids in the contact aureole.
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Hobson, A., Bussy, F., Hernandez, J. (2000). Migmatitic Gabbros From a Shallow-Level Metamorphic Contact Aureole, Fuerteventura Basal Complex, Canary Islands: Role of Deformation in Melt Segregation. In: Bagdassarov, N., Laporte, D., Thompson, A.B. (eds) Physics and Chemistry of Partially Molten Rocks. Petrology and Structural Geology, vol 11. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4016-4_7
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DOI: https://doi.org/10.1007/978-94-011-4016-4_7
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