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《Geochimica》 2010-02
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Parital melting experimental study of pelite at 800 MPa:REE geochemical characteristics of melts and residual phase

ZHANG Jin-xu1,2,ZHANG Hui1,GUAN Shen-jin1,2,TANG Yong1 and LZheng-hang1,2 1.Laboratory for Study of the Earth's Interior and Geofluids,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China  
Partial melting experiments of pelite were conducted at 800 MPa and different temperatures by JL-3600t pressure vessel.The main chemical compositions and trace element (including REE) concentrations of the quenched melts and residual minerals were determined using EMPA and LA-ICPMS.It shows that REE contents in melt,formed at low degree of partial melting ( 25%),range from 308.8 to 3565 μg/g,indicating REE is significantly heterogeneously distributed in the melt.The REE chondrite-normalized pattern shows slight M-type "tetrad effect".In the residual garnets,REE contents vary from 167.5 to 1008 μg/g,also showing heterogeneous distribution of REE.It's characterized by obvious W-type REE "tetrad effect" as normalized to chondrite,especially in the first segment from La to Nd.At more than 30%of partial melting,REE is relatively homogeneously distributed in the melt and residual garnets,ranged from 523.2 to 1130 μg/g and 288.6 to 512.7 μg/g,respectively.In the chondrite-normalized patterns,REE "tetrad effect" is not shown either in the melt or in the residual garnets.According to the mass balance calculation of chlorine before and after experiments,it indicates that the exsolution of magmatic volatile phase didn't occur during the experiments.Therefore,we deduce that the origin of REE "tetrad effect" in the S-type granite may be associated with the low degree of partial melting of pelite.
【Fund】: 国家自然科学基金(40673052);; 中国科学院地球化学研究所矿床地球化学国家重点实验室开放课题(2008012)
【CateGory Index】: P599
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