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Review of melting experiments on carbonated eclogite and peridotite:insights into mantle metasomatism

Review of melting experiments on carbonated eclogite and per...

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中国科学院地质与地球物理研究所2012年度（第12届）...

作者： Peng-Fei Zhang Yan-Jie Tang Yan Hu Hong-Fu Zhang Ben-Xun Su Yan Xiao M.Santosh State Key Laboratory of Lithosphere Evolution Institute of Geology and GeophysicsChinese Academy of Sciences College of Earth Science Graduate University of Chinese Academy of Sciences Division of Interdisciplinary Science Faculty of ScienceKochi UniversityKochi 780-8520Japan

Experimental studies on the partial melting of eclogite and peridotite provide important clues on mantle metasomatism. Here,we review results from some of the recent experiments and show that melting of carbonated eclogite and peridotite can produce carbonatitic to carbonated silicate melt,in which carbonates melt preferentially before Ti oxides and silicates. Low-degree melting results in carbonatitic melt coexisting with Ti oxides and *** process also leads to the fractionation between some high-field strength elements(Nb,Ta,Zr,Hf,and HREE) and highly incompatible elements(U and Th) in the *** Ti oxides are nearly exhausted in eclogite,extremely high TiO contents(e.g.19 wt.%) are present in the melt with marked concentration of Nb and *** results help to explain the features of carbonatitic metasomatism and the Nb-Ta spike in oceanic island basalts as identified in experimental *** studies also explain the reducing conditions that stabilize diamond in the deep mantle(>150 km) as well as the occurrence of diamond at different depths reported in various *** in such a reduced mantle can happen through redox reaction between diamond,pyroxene, and olivine,in which the initial liquid is a carbonated silicate ***,the theoretical oxygen fugacity(fO) in the asthenosphere is much lower than that predicted by the reaction and requires elevated fO,which can be caused by the addition of relatively oxidized materials from the lower mantle,deep asthenospheric material,and various recycled components. A combination of these processes generates locally oxidized domains in the deep mantle.

关键词： melting experiments carbonated eclogite peridotite carbonatitic and silicate melts mantle metasomatism redox state

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