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- W2368149619 abstract "A series of leucogranites occur in lenticular and banded forms in the Altay high-grade metamorphic zone, Xinjiang. According to their mineral assemblages, these leucogranites can be divided into three groups: Al2SiO5-bearing leucogranites, muscovite-plagioclase leucogranites and muscovite monzo-leucogranites. An analysis of major elements shows that these leucogranites belong to S-type with A/CNK being 1.1～2.14. From the muscovite monzo-leucogranites through muscovite-plagioclase leucogranites to Al2SiO5-bearing leucogranites, SiO2 contents increase and Al2O3, Na2O and K2O contents decrease. The phase relations in pT pseudosection for the NKFMASH system and the calculation of melt composition at different pressures and temperatures show that the melts of Al2SiO5-bearing and muscovite-plagioclase leucogranites might have originated from an uplifting process of the kyanite-type metamorphic zone, with no relation to the muscovite dehydration-melting reaction. Moreover, the Al2SiO5-bearing leucogranites were probably not directly crystallized from the melt, but had to do with some losses of alkaline components through fluids. The muscovite monzo-leucogranites probably originated from a heating process through the muscovite dehydration-melting reaction. The modeling of phase relations also indicates that the staurolite dehydration-melting reaction must have played a very important role in the melt formation." @default.
- W2368149619 created "2016-06-24" @default.
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- W2368149619 date "2007-01-01" @default.
- W2368149619 modified "2023-09-25" @default.
- W2368149619 title "Characteristics and petrogenetic simulation of leucogranitic veins in the Altay high-grade metamorphic zones, Xinjiang" @default.
- W2368149619 hasPublicationYear "2007" @default.
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