Journal of Metamorphic Geology
© John Wiley & Sons Ltd
Edited By: Michael Brown, Katy Evans, Doug Robinson, Richard White and Donna Whitney
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ISI Journal Citation Reports © Ranking: 2015: 3/47 (Geology)
Online ISSN: 1525-1314
Open- and closed-system processes in the formation of migmatites and migmatitic granulites
Migmatites are widely interpreted to have been formed by partial melting, particularly by hydrate-breakdown melting reactions, and processes in melt-bearing rocks feature prominently in subsequent sections. However, this view of migmatite formation was not always as widely held as at the present. For example, in the Quetico Metasedimentary Belt layer-parallel leucosomes were interpreted to have formed by a formed by a subsolidus, stress-induced mass transfer process that enabled mobilization of the quartz and feldspar from the host rocks to form leucosomes by pressure solution (Sawyer & Barnes, 1988). In contrast, discordant leucosomes in these rocks were interpreted to represent injected, variably fractionated melts generated during exhumation.
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Sawyer, E.W. & Barnes, S.J., 1988. Temporal and compositional differences between subsolidus and anatectic migmatite leucosomes from the Quetico metasedimentary belt, Canada. Journal of Metamorphic Geology, 6, 437-450
Hansen, E.C., Newton, R.C. & Janardhan, A.S., 1984. Fluid inclusions in rocks from the amphibolite-facies gneiss to charnockite progression in southern Karnataka, India: direct evidence concerning the fluids of granulite metamorphism Journal of Metamorphic Geology, 2, 249-264.
Giorgetti, G., Frezzotti, M.-L., Palmeri, R. & Burke, E.A.J., 1996. Role of fluids in migmatites: CO2-H2O fluid inclusions in leucosomes from the Deep Freeze Range migmatites (Terra Nova Bay, Antarctica). Journal of Metamorphic Geology, 14, 307–317.
Sorensen, S.S., 1988, Petrology of amphibolite-facies mafic and ultramafic rocks from the Catalina Schist, Southern California; metasomatism and migmatization in a subduction zone metamorphic setting. Journal of Metamorphic Geology, 6, 405–435.
Johnson, T.E., Hudson, N.F.C. & Droop, G.T.R., 2001. Partial melting in the Inzie Head gneisses: the role of water and a petrogenetic grid in KFMASH applicable to anatectic pelitic migmatites. Journal of Metamorphic Geology, 19, 99–118.
Jung, S., Mezger, K., Masberg, P., Hoffer, E. & Hoernes, S., 1998. Petrology of an intrusion-related high-grade migmatite: implications for partial melting of metasedimentary rocks and leucosome-forming processes. Journal of Metamorphic Geology, 16, 425–445.
Hartel, T.H.D. & Pattison, D.R.M., 1996. Genesis of the Kapuskasing (Ontario) migmatitic mafic granulites by dehydration melting of amphibolite: The importance of quartz to reaction progress. Journal of Metamorphic Geology, 14, 591–611.
Daczko, N.R., Clarke, G.L. & Klepeis, K.A., 2001. Transformation of two-pyroxene hornblende granulite to garnet granulite involving simultaneous melting and fracturing of the lower crust, Fiordland, New Zealand. Journal of Metamorphic Geology, 19, 547–560.
Clarke, G.L., Daczko, N.R., Klepeis, K.A. & Rushmer, T., 2005. Roles for fluid and/or melt advection in forming high-P mafic migmatites, Fiordland, New Zealand. Journal of Metamorphic Geology, 23, 557–567.
Lancaster, P. J., Fu, B., Page, F.Z., Kita, N.T., Bickford, M.E., Hill, B.M., McLelland, J.M. & Valley, J.W., 2009. Genesis of metapelitic migmatites in the Adirondack Mountains, New York. Journal of Metamorphic Geology, 27, 41–54.