The composition of KLB-1 peridotite
The composition of KLB-1 peridotite
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DOI：
10.2138/am.2009.2984
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发表时间：
2009-01-01
影响因子：
3.1
通讯作者：
Hirschmann, Marc M.
中科院分区：
文献类型：
--
作者：
Davis, Fred A.;Tangeman, Jean A.;Hirschmann, Marc M.
本文介绍了两种天然KLB-1橄榄岩玻璃化样品的主、微量元素氧化物成分的电子探针分析。一个玻璃是用磷酸盐助熔剂制成的，第二个玻璃是用激光熔化空气动力学悬浮的球体制成的，结果是均匀的硅酸盐玻璃珠。由于未知的原因，硅酸盐-磷酸盐玻璃产生的成分与KLB-1橄榄岩的成分不相容。然而，对激光合成形成的玻璃珠的分析被认为可以准确地表示KLB-1橄榄岩的组成，除了Na(2)O由于挥发而有少量损失。新的数据解决了矛盾的FeO， CaO，和TiO(2)，从两个旧的测量值目前在文献中。使用新的成分测量方法进行的质量平衡计算与KLB-1中矿物成分的新分析相结合，得出的残差平方和比使用旧测量方法的结果要低。当使用旧的KLB-1分析方法和我们的新分析方法计算时，KLB-1部分熔化实验的计算模式有明显的差异。
Electron microprobe analyses of major- and minor-element oxide components for two glassed samples of natural KLB-1 peridotite are presented. One glass was made with the aid of a phosphate flux, and the second glass was made by laser melting of aerodynamically levitated spheroids resulting in homogeneous silicate glass beads. For unknown reasons, the silicate-phosphate glass yields compositions that are incompatible with the composition of KLB-1 peridotite. However, analysis of the glass bead formed by laser synthesis is believed to give an accurate representation of the composition of KLB-1 peridotite, except for minor loss of Na(2)O owing to volatilization. The new data resolve conflicting FeO, CaO, and TiO(2), values from two older measurements present in the literature. Mass-balance calculations using the new composition measurement combined with new analyses of the mineral compositions in KLB-1 result in a lower sum of squares of the residuals than those using the older measurements. There are appreciable differences in calculated modes from partial-melting experiments of KLB-1 when calculated using older KLB-1 analyses or our new analysis.