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《Acta Petrologica Sinica》 1995-04
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Study on Fluid Inclusions from High Grade MetamorphicRocks In East Hebei Province

Liu Shuwen(Peking University, Beijing, 100871)  
Fluid inclusions from high grade metamorphosed garnet plagioclase gneisses, garnetbringfree honblende two pyroxene gneisses, charnockite, amphibolite and trondhjemites in East Hebei province can bedivided into four types by trapped order. The first type is H2O and CO2 two liquid phase inclusions, in whichCO2 partial homogenization temperature is-12℃, density 1. 04g/cm3 and H2O content about 21 %~39%(mole% ). The second type is CO2 liquid phase inclusions with freezing temperature of-56℃~61℃, homogenization temperature of-7. 4℃~-35. 1℃, CO2 density about 1. 05g/cm3 and CO2 content 82. 1~98. 4 %(mole), having a little of CH4, N2 and H2. The third type is H2O and CO2 multiple phases inclusions in whichCO2 partial homogenization temperature is about 7℃~28℃ and CO2 density 0. 64~0. 93g/cm3. In this type offluid inclusions, CO2, CH4 and CO are major components in gas phase and H2O and CO2 in liquid phase. The lasttype is multiple generations brine inclusions in which freezing temperature is -0. 5℃~20℃, salinity 0. 87 %~22. 8% (wt% ) and brine density 0. 7~1. 05g/cm3. Their homogenization temperature shows two peaks at150℃~200℃ and about 300℃. Fluid inclusions in different generations record isodensity decreasing temperature P-T paths. H2O/H2O+CO2 (mole) ratio reduces from peak metamorphism to earlier decreacing temperaturemetamorphic processes, but this ratio increases in late retrograde metamorphism and uplifting processes.
【Fund】: 博士后基金
【CateGory Index】: P588.3
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