The effect of sodium and titanium on crystal-melt partitioning of trace elements

被引：69

作者：

Bennett, SL ^{[1
]}

Blundy, J ^{[1
]}

Elliott, T ^{[1
]}

机构：

[1] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 2004年 / 68卷 / 10期

关键词：

D O I：

10.1016/j.gca.2003.11.006

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 [地球物理学]; 070902 [地球化学];

摘要：

Eclogite of recycled slab origin has often been invoked in the source region of mid-ocean ridge and ocean-island basalts. Melts of this eclogitic material are expected to be enriched in incompatible elements including major elements such as Na and Ti. In order to investigate the controls on trace element chemistry of a melt from such a recycled component we have performed trace element partitioning experiments in the simple systems CMAS (CaO-MgO-Al2O3-SiO2), NCMAS (Na2O-CMAS) and Ti-CMAS (TiO2-CMAS) at 3 GPa and 1298-1500degreesC using analogue eclogitic compositions. We show that sodium has a profound effect on clinopyroxene-melt partition coefficients. NCMAS is characterized by elevated partition coefficients, relative to CMAS for all elements except Li. The increase is more pronounced for more highly charged cations, resulting in negative partitioning anomalies for Li, Sr, Ba and Pb. In contrast to sodium, titanium has very little effect on trace element partitioning for all elements except Nb and Ta. which are retained by the rutile that is saturated in this run. Copyright (C) 2004 Elsevier Ltd.

引用

页码：2335 / 2347

页数：13

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