Journal of Metamorphic Geology

Cover image for Vol. 34 Issue 9

Edited By: Michael Brown, Katy Evans, Doug Robinson, Richard White and Donna Whitney

Impact Factor: 3.673

ISI Journal Citation Reports © Ranking: 2015: 3/47 (Geology)

Online ISSN: 1525-1314

Thermobarometry, PT paths, phase equilibria modelling and retrograde processes in formerly melt-bearing rocks

An important task in any petrological study is to quantify the P–T–X conditions of metamorphism. The first group of papers discussed in this section concerns determination of the P–T conditions and definition of the P–T paths from metamorphic rocks using combinations of results from thermobarometry and reactions formulated from interpretations of microstructural relations linked to generalized petrogenetic grids. Although evidence of the prograde path is commonly lacking, sometimes inclusion assemblages in garnet enable this to be constrained and allow for a more complete P–T path to be constructed (Jones & Brown, 1990).

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Jones, K.A. & Brown, M., 1990. High-temperature ‘clockwise’ P-T paths and melting in the development of regional migmatites: an example from southern Brittany, France Journal of Metamorphic Geology, 8, 551-578

Montel, J.M., Marignac, C., Barbey, P. & Pichavant, M. 1992. Thermobarometry and granite genesis: the Hercynian low-P, high-T Velay anatectic dome (French Massif Central). Journal of Metamorphic Geology, 10, 1–15.

Greenfield, J.E., Clarke, G.L. & White, R.W., 1998. A sequence of partial melting reactions at Mt Stafford, central Australia. Journal of Metamorphic Geology, 16, 363–378.

Kawakami, T., 2001. Tourmaline breakdown in the migmatite zone of the Ryoke metamorphic belt, SW Japan. Journal of Metamorphic Geology, 19, 61–75.

Brown, M., 2002. Retrograde processes in migmatites revisited. Journal of Metamorphic Geology, 20, 25–40.

Raith, M., Karmakar, S. & Brown, M. 1997. Ultrahigh-temperature metamorphism and multi-stage decompressional evolution of sapphirine granulites from the Palni Hill Ranges, Southern India. Journal of Metamorphic Geology, 15, 379–399.

Cenki, B., Kriegsman, L. M. & Braun, I., 2002. Melt-producing and melt-consuming reactions in the Achankovil cordierite gneisses, South India. Journal of Metamorphic Geology, 20, 543–561.

Gibson, R.L., 2002. Impact-induced melting of Archean granulites in the Vredefort Dome, South Africa. I: anatexis of metapelitic granulites. Journal of Metamorphic Geology, 20, 57–70.

Martignole, J. & Martelat, J.-E., 2003. Regional-scale Grenville-age UHT metamorphism in the Mollendo–Camana block (basement of the Peruvian Andes). Journal of Metamorphic Geology, 21, 99–120.

Lang, H.M. & Gilotti, J.A., 2007. Partial melting of metapelites at ultrahigh-pressure conditions, Greenland Caledonides. Journal of Metamorphic Geology, 25, 129–147.

White, R.W., Powell, R. & Holland, T.J.B. 2001. Calculation of partial melting equilibria in the system Na2O-CaO-K2O-FeO-MgO-Al2O3-SiO2-H2O (NCKFMASH). Journal of Metamorphic Geology, 19, 139–153.

White, R.W. & Powell, R. 2002. Melt loss and the preservation of granulite facies mineral assemblages. Journal of Metamorphic Geology, 20, 621–632.

Harris, N.B.W., Caddick, M., Kosler, J., Goswami, S., Vance, D. & Tindle, A.G. 2004. The pressure–temperature–time path of migmatites from the Sikkim Himalaya. Journal of Metamorphic Geology, 22, 249–264.

Johnson, T., Brown, M., Gibson, R. & Wing, B. 2004. Spinel-cordierite symplectites replacing andalusite: Evidence for melt-assisted diapirism in the Bushveld Complex, South Africa. Journal of Metamorphic Geology, 22, 529–545.

White, R.W., Powell, R. & Halpin, J.A. 2004. Spatially-focused melt formation in aluminous metapelites from Broken Hill, Australia. Journal of Metamorphic Geology, 22, 825–845.

Clarke, G.L., White, R.W., Lui, S., Fitzherbert, J.A. & Pearson, N.J., 2007. Contrasting behaviour of rare earth and major elements during partial melting in granulite facies migmatites, Wuluma Hills, Arunta Block, central Australia. Journal of Metamorphic Geology, 25, 1–18.

White, R.W., Powell, R. & Holland, T.J.B. 2007. Progress relating to calculation of partial melting equilibria for metapelites. Journal of Metamorphic Geology, 25, 511–527.

Johnson, T.E., White, R.W. & Powell, R., 2008. Partial melting of metagreywacke: a calculated mineral equilibria study. Journal of Metamorphic Geology, 26, 837–853.

Grant, J.A., 2009. Thermocalc and experimental modelling of melting of pelite, Morton Pass, Wyoming. Journal of Metamorphic Geology, 27, 571–578.

Baldwin, J. A., Powell, R., Brown, M., Moraes, R. & Fuck, R.A., 2005. Modelling of mineral equilibria in ultrahigh-temperature metamorphic rocks from the Anapolis-Itaucu Complex, central Brazil. Journal of Metamorphic Geology, 23, 511–531.

White, R.W. & Powell, R., 2010. Retrograde melt–residue interaction and the formation of near-anhydrous leucosomes in migmatites. Journal of Metamorphic Geology, 28, 579–597.