Study on elemental mobility in the process of ultrahigh-pressure metamorphism by SRXRF

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XIAO Wan-Sheng, WENG Ke-Nan, XU Shi-Ping, CHEN Jin-Yang, HONG Shi-Ming and HAN Yin-Wen. Study on elemental mobility in the process of ultrahigh-pressure metamorphism by SRXRF[J]. Chinese Physics C, 2003, 27(S1): 77-82.
XIAO Wan-Sheng, WENG Ke-Nan, XU Shi-Ping, CHEN Jin-Yang, HONG Shi-Ming and HAN Yin-Wen. Study on elemental mobility in the process of ultrahigh-pressure metamorphism by SRXRF[J]. Chinese Physics C, 2003, 27(S1): 77-82. shu
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Received: 2003-11-21
Revised: 1900-01-01
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Study on elemental mobility in the process of ultrahigh-pressure metamorphism by SRXRF

    Corresponding author: XIAO Wan-Sheng,
  • Guangzhou Institute of Geochemistry,CAS,Guangzhou 510640,China2 Southwest Jiaotong University,Chengdu 610031,China3 China University of Geosciences,Wuhan 430074,China

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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