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Abstract:
Unique sampling assemblages were designed to investigate elemental mobility of the systems of plagioclase amphiblite-CaCO3(-H2O) on the conditions of ultrahigh pressure contact metamorphism of eclogite phase.The experiments were carried out using multianvil apparatus at pressures of 4.5 and 5.5 GPa and temperatures of 800 and 1100°C for 6 to 16 hours respectively.The columniform samples after ultrahigh pressure contact metamorphism were sliced and polished along the axes.After observed by SEM,the samples were investigated by synchrotron radiation X-ray fluorescence (SPCRF) method. The SRXRF results indicate that the mobility of Ca,Sr and Fe is decreased with increasing pressure,and the effect of temperature is reversed and low than that of pressure.The Sr mobility in the process of ultrahigh pressure metamorphism is faster than that of Ca and Fe which is similar,this means that Sr would separate from Ca.H2O accelerates greatly the elemental mobility rate,and its effect exceed greatly that of CO2,which is as such the most important fluid composition in the deep Earth.
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