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

XIAO Wan-Sheng; WENG Ke-Nan; XU Shi-Ping; CHEN Jin-Yang; HONG Shi-Ming; HAN Yin-Wen

Chinese Physics C> 2003, Vol. 27> Issue(S1) : 77-82

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

Guangzhou Institute of Geochemistry,CAS,Guangzhou 510640,China2 Southwest Jiaotong University,Chengdu 610031,China3 China University of Geosciences,Wuhan 430074,China

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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.

References

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LIU Yi-Can, XU Shu-Tong, LI Shu-Guang et al.,science in china D30(supplement):99-107(in Chinese)(刘贻灿，徐桐，李曙光等.中国科学(D),30(增刊),99-107 )2 Van Orman .T A.Grove T L, Shimizu N. Contrib Mineral Petrol, 2001，141: 687-7033 Irifune T. Ringwood A F，Hibberson W O. Earth Planet. Sci. Lett. 1994, 126: 351-3684 LI Shu-Guang,XIAO Yi-Lin. Acta Mineralogica Sinica, 1994，14: 115-122(in Chinese)(李曙光，肖益林.矿物学报，1994,14,115-122)5 CONC B L, WANG Q. Chines Science Bulletin, 1999，44:1127-1141(in Chinese)(从柏林，王清晨.科学通报，1999 , 44: 1127-1141)6 WANG Qing-Chen. Acta Geoscientia Sinica, 2001，22:11-16(in Chinese)(王清晨.地球学报，2001,22(1):11-16)7 Rumble D, WANC Q,ZHANG R. Lithos, 2000，52:79-988 ZHANC R Y, Liou J C, CONC L. Journal of Petrology, 1995，36:1011-10389 Katayama I, Parkinson C D, Okamoto K et al. Am Mineral, 2000，85:1368-1374

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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.

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Received: 2003-11-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2003-11-21
Accepted Date: 1900-01-01
Available Online: 2003-01-02

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.