The partitioning of trace elements between ilmenite, ulvospinel, armalcolite and silicate melts with implications for the early differentiation of the moon
The partitioning of trace elements between ilmenite, ulvospinel, armalcolite and silicate melts with implications for the early differentiation of the moon
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DOI：
10.1016/j.chemgeo.2006.05.005
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发表时间：
2006-11
期刊：
影响因子：
3.9
通讯作者：
S. Klemme;D. Günther;K. Hametner;Stefan Prowatke;T. Zack
中科院分区：
文献类型：
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作者：
S. Klemme;D. Günther;K. Hametner;Stefan Prowatke;T. Zack
矿物/熔体微量元素分配系数为大量的微量元素（Zr，Hf，Ta，Nb，V，Co，Cu，Zn，Sr，REE，Sb，Sn，Mo，Cr，W，U，Th）实验测定钛铁矿（FeTiO 3），ulvöspinite（Fe 2 TiO 4），矿物的铁铝尖晶石固溶体（Fe，Mg）Ti 2 O 5）。测得的分配系数表明，高场强元素（Zr，Hf，Nb和Ta）和一些过渡金属（V，Cr，Co，Sn）是适度兼容的铁-钛氧化物，而其他元素（REE，Y，Sr，U，Th，Mo，Sb和W）是强烈不相容的。U的分配系数总是显著高于Th的分配系数，这使得Fe-Ti氧化物有效地从Th中分离U。我们的数据还表明，钛铁矿，和其他铁钛氧化物，能够从铪，后者是更兼容的压裂钨。这使得铁-钛氧化物在月球演化过程中成为影响Hf-W同位素比率的非常有效的因素。此外，还给出了含铁、钛斜方辉石的微量元素分配系数。
Mineral/melt trace element partition coefficients for a large number of trace elements (Zr, Hf, Ta, Nb, V, Co, Cu, Zn, Sr, REE, Sb, Sn, Mo, Cr, W, U, Th) were determined experimentally for ilmenite (FeTiO3), ulvöspinel (Fe2TiO4), minerals of the armalcolite solid solution (Fe,Mg)Ti2O5). The measured partition coefficients indicate that the high field strength elements (Zr, Hf, Nb, and Ta) and some transition metals (V, Cr, Co, Sn) are moderately compatible in iron–titanium oxides, whereas other elements (REE, Y, Sr, U, Th, Mo, Sb, and W) are strongly incompatible. The partition coefficients for U are always significantly higher than the Th partition coefficients which makes Fe–Ti oxides efficient in fractionating U from Th. Our data also indicate that ilmenite, and other iron–titanium oxides, are able to fractionate W from Hf, the latter of which is much more compatible. This makes the iron–titanium oxides very effective agents to influence Hf–W isotopic ratios during the evolution of the moon. In addition, we also present some trace element partition coefficients for iron and titanium-bearing orthopyroxene.