Experimental Determination of Partition Coefficients of Vanadium During Partial Melting of Eclogite

被引：0
|
作者：
Ruan M. [1 ,2 ]
Wang J. [1 ,2 ]
Li L. [1 ]
Xiong X. [1 ]
机构：
[1] State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, Guangdong
[2] University of Chinese Academy of Sciences, Beijing
来源：
Geotectonica et Metallogenia | 2020年 / 44卷 / 03期
关键词：
Oxygen fugacity; Partial melting of eclogite; Partition coefficient of vanadium;
D O I：
10.16539/j.ddgzyckx.2020.03.014
中图分类号：
学科分类号：
摘要：
Vanadium (V) is a common multivalent element whose partitioning behavior between minerals and melts is mainly controlled by oxygen fugacity. In recent years, the dependence of vanadium partitioning behavior on oxygen fugacity has often been used to reveal the redox state of mantle. Whether vanadium can migrate during the subduction of the plate is crucial to understand the geochemical behavior of vanadium in subduction zone, and is an important prerequisite for exploring oxygen fugacity in the mantle wedge. In this paper, vanadium partition coefficients of garnet, clinopyroxene, and rutile were determined experimentally through simulating partial melting of eclogite with piston cylinder apparatus. The experimental pressure is 2.5 GPa, temperatures range from 900 to 1125 ℃, and the calculated oxygen fugacity (ΔFMQ) of the run products varies from -5.24 to +0.74. The results show that vanadium is compatible in garnet, clinopyroxene and rutile (mineral/melt partition coefficient D>1.0), and DV (rutile/melt)> DV(clinopyroxene/melt)>DV(garnet/melt). These vanadium partition coefficients are also functions of oxygen fugacity, temperature, and melt polymerization degree; and they all decrease with increasing oxygen fugacity, temperature, and degree of melt polymerization. The modelling results show that vanadium is significantly depleted during partial melting of eclogite, and thus, vanadium is considered to be immobile during partial melting of subducted MORBs. We concluded that metasomatism by the melts produced by partial melting of eclogite during plate subduction will not substantially modify vanadium concentration in the mantle wedge. The partitioning behavior of vanadium during mantle melting can be used to detect oxygen fugacity of the mantle. © 2020, Science Press. All right reserved.
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页码：514 / 526
页数：12
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