| Experimental Studies on Partial Melting of Massive Samples of Granite |
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| 作者姓名： | 林强 吴福元 |
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| 作者单位： | ChangchunUniversityofEarthSciences,Changcun,130061 |
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| 摘 要： | As a basis of modern petrology,the equilibrium relations describing the melting of granite were established mainly on melting experiments of Powder samples.Such experiments,however,have serious limitations in providing information about the variations in compositional and fabric features of the minerals and in the composition and distribution of the melt.Our experiments using massive samples indicate that melt occure mainly at the quartz-plagioclase and quartz-potash feldspar boundaries and the composition of the melt is dependent on local characteristics in the melting system,showing no correlation with the bulk composition of the rock samples.At lower temperatures(740-760℃,0.2GPa),the melt plots at or near the eutectic point in Q-Ab-Or-An-H2O diagram,indicating equilibrium melting.At higher temperatures(790-800℃，0.2GPa)the melt becomes lower in SiO2 and higher in Na2O,deviating makedly from the eutectic line but without disappearance of any mineral phase,suggesting a non-equilibrium process.It is obvious that the phase-equilibrium relations in natural massive granites may be greatly different from those deduced from powder experiments.
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| 关 键 词： | 花岗岩 岩浆 岩石学 二氧化硅 氧化钠 |
Experimental studies on partial melting of massive samples of granite |
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| Lin Qiang,Wu Fuyuan.Experimental Studies on Partial Melting of Massive Samples of Granite[J].Chinese Journal of Geochemistry,1994,13(4):363-370. |
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| Authors: | Lin Qiang Wu Fuyuan |
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| Institution: | (1) Changchun University of Earth Sciences, 130061 Changchun |
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| Abstract: | As a basis of modern petrology, the equilibrium relations describing the melting of granite were established mainly on melting
experiments of Powder samples. Such experiments, however, have serious limitations in providing information about the variations
in compositional and fabric features of the minerals and in the composition and distribution of the melt. Our experiments
using massive samples indicate that melt occurs mainly at the quartz-plagioclase and quartz-potash feldspar boundaries and
the composition of the melt is dependent on local characteristics in the melting system, showing no correlation with the bulk
composition of the rock samples. At lower temperatures (740 ∼ 760°C, 0.2 GPa), the melt plots at or near the eutectic point
in Q-Ab-Or-An-H2O diagram, indicating equilibrium melting. At higher temperatures (790 ∼ 800°C, 0.2 GPa) the melt becomes lower in SiO2 and higher in Na2O, deviating makedly from the eutectic line but without disappearance of any mineral phase, suggesting a non-equilibrium process.
It is obvious that the phase-equilibrium relations in natural massive granites may be greatly different from those deduced
from powder experiments.
This project was financially supported by the National Natural Science Foundation of China. |
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| Keywords: | granite melting system massive sample |
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