Phase equilibrium modeling, fluid inclusions and origin of charnockites in the Datian region of the northeastern Cathaysia Block, South China
作者： Xiao-Qiang Yang , Zi-Long Li , Sheng-Qiang Yu
DOI: 10.1016/J.JSEAES.2016.05.024
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摘要: Abstract Charnockites in the Datian region of northeastern Cathaysia Block, South China have an assemblage garnet, clinopyroxene, orthopyroxene, plagioclase, anti-perthite, K-feldspar, biotite, quartz and ilmenite. Phase equilibrium modeling indicates that charnockite was formed at T = 845–855 °C P = 8.2–8.4 kbar with corresponding water activity lower than 0.50. Fluid inclusions are dominated by N 2 CO minor CH 4 . The fluids homogenized to liquid −153.0 −138.8 °C 18.3–21.6 °C, respectively, showing a low-density nature. could be attributed selective leakage due affinity melt decompression-dominated retrograde process. Combined previous studies, two-stage formation model is proposed interpret petrogenesis charnockite, viz emplaced Paleoproterozoic underwent granulite-facies metamorphism during Phanerozoic tectonic event.
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