Melting of vapour-absent tonalite at 10 kbar to simulate dehydration–melting in the deep crust

Rutter, Michael J.; Wyllie, Peter J.

doi:10.1038/331159a0

Cited by 190 publications

(67 citation statements)

References 17 publications

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“…1) The petrological and geochemical properties of YJGR and ADGR (Lee et al, 1998) suggest that their parental magmas would have been of tonalitic composition, and the source materials should be more mafic than this composition. Although the potential source materials in continental arc envi ronment have a wide range in the lower crust, the most plausible protoliths for the generation of a large volume, metaluminous, I-type tonalite magma are considered to be mafic igneous rocks or their metamorphic equivalents (Chappell and Stephens, 1988;Rutter and Wyllie, 1988 (Fig. 9), sug gesting that at least two isotopically different sources have existed in the lower crust.…”

Section: Granitic Magmatism In Ogcheon Belt and Yeongnam Massifmentioning

confidence: 99%

Sr and Nd isotopic compositions of late Paleozoic Youngju and Andong granites in the northeastern Yeongnam Massif, Korea.

Lee¹,

Jwa

Park³

et al. 1999

Geochem. J.

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Section: Granitic Magmatism In Ogcheon Belt and Yeongnam Massifmentioning

confidence: 99%

Sr and Nd isotopic compositions of late Paleozoic Youngju and Andong granites in the northeastern Yeongnam Massif, Korea.

Lee¹,

Jwa

Park³

et al. 1999

Geochem. J.

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“…Sawyer 1996Sawyer , 2008; and references therein), (ii) glass analyses from the relatively few reported studies of glassy MI in metasedimentary/metagranitic anatectic enclaves and rehomogenized nanogranitoids in migmatites and granulites (Cesare et al 1997;2009;Acosta-Vigil et al 2007;Ferrero et al 2012Ferrero et al , 2014Ferrero et al , 2015Bartoli et al 2013aBartoli et al , 2013b press), and (iii) Helz 1976;Rutter and Wyllie 1988;Hacker 1990;Rushmer 1991;Rapp et al 1991;Wolf and Wyllie 1994;Rapp and Watson 1995;Skjerlie and Patiño Douce 2002;Schmidt et al 2004;Laurie and Stevens 2012;Quian and Hermann 2013).…”

Section: Significance Of Glass Compositions In Remelted Nanogranitoidsmentioning

confidence: 99%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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The study of the composition of primary melts during anatexis of high-pressure granulitic migmatites is relevant to understand the generation and differentiation of continental crust.Peritectic minerals in migmatites can trap dropless of melt that forms via incongruent melting reactions during crustal anatexis. These melt inclusions commonly crystallize and form nanogranitoids upon slow cooling of the anatectic terrane. To obtain the primary compositions of crustal melts recorded in these nanogranitoids, including volatile concentrations and information on fluid regimes, they must be remelted and rehomogenize before analysis. A new occurrence of nanogranitoids was recently reported in garnets of mylonitic metapelitic gneisses (former high pressure granulitic migmatites) at the bottom of the prograde metamorphic sequence of Jubrique, located on top of the Ronda peridotite slab (Betic Cordillera, S Spain). Nanogranitoids within separated chips of cores and rims of large garnets from these former migmatites were remelted at 15 kbar and 850, 825 or 800 ºC and dry (without added H 2 O), during 24 hours, using a piston cylinder apparatus. Although all experiments show glass (former melt) within melt inclusions, the extent of rehomogenization depends on the experimental temperature. Experiments at 850-825 ºC show abundant disequilibrium microstructures, whereas those at 800 ºC show a relatively high proportion of rehomogenized nanogranitoids, indicating that anatexis and entrapment of melt inclusions in these rocks was likely close to 800 ºC. Electron microprobe and NanoSIMS analyses show that experimental glasses are leucogranitoid and peraluminous, though define two distinct compositional groups. Type I corresponds to K-rich, Ca-and H 2 O-poor leucogranitic melts, whereas type II represents K-poor, Ca-and H 2 O-rich granodioritic to tonalitic melts. Type I and II melt inclusions are found in most cases at the cores and rims of large garnets, respectively. We tentatively suggest that these former migmatites underwent two melting events under contrasting fluid regimes, possibly during two different orogenic periods. This 3 study demonstrates the strong potential of melt inclusions studies in migmatites and granulites in order to unravel their anatectic history, particularly in strongly deformed rocks where most of the classical anatectic microstructures have been erased during deformation.

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“…The first requirement may be satisfied during melting, especially at low degrees of melting, but the second requirement is more difficult to evaluate. However, the most mafic quartz At pressures of 10 to 15 kbar calc-alkaline liquids coexist with garnet under both vaporsaturated and -undersaturated conditions (Huang and Wyllie, 1986;Rutter and Wyllie, 1988;Caroll and Wyllie, 1990). None of the granodiorites shows significant HREE depletion (i.e Yb N < 10) predicted for melts that equilibrated with residual garnet suggesting that they formed alternatively under lower pressures, with less garnet in the residuum or garnet was melted to a large extent during formation of the melts.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Geochronology, geochemistry and Nd, Sr and Pb isotopes of syn-orogenic granodiorites and granites (Damara orogen, Namibia) — Arc-related plutonism or melting of mafic crustal sources?

Osterhus

Jung

Berndt

et al. 2014

Lithos

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Melting of vapour-absent tonalite at 10 kbar to simulate dehydration–melting in the deep crust

Cited by 190 publications

References 17 publications

Sr and Nd isotopic compositions of late Paleozoic Youngju and Andong granites in the northeastern Yeongnam Massif, Korea.

Sr and Nd isotopic compositions of late Paleozoic Youngju and Andong granites in the northeastern Yeongnam Massif, Korea.

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Geochronology, geochemistry and Nd, Sr and Pb isotopes of syn-orogenic granodiorites and granites (Damara orogen, Namibia) — Arc-related plutonism or melting of mafic crustal sources?

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