Composition of the Metallic Phases in some Stone and Stony-Iron Meteorites
Composition of the Metallic Phases in some Stone and Stony-Iron Meteorites
复制标题
一些石陨石和石铁陨石中金属相的组成
作者：
S. Reed
对10个球粒陨石和2个菱铁矿进行了研究，用电子探针微区分析测定了金属相中镍的含量。关于球粒陨石中金属颗粒组成的信息对于确定它们是在环境中形成还是通过大型金属体碎片的积累而形成是有价值的。由于颗粒很小，传统的化学分析仅限于确定金属的平均成分。Ringwood 1测定了一些球粒陨石中的铁粒陨石(α-镍-铁)和钛铁矿(γ-镍-铁)的晶格参数，并从这些测量中推断出组成。更可取的是使用更直接的方法获取成分信息：电子探针微量分析的优点是将合理的精密度(测量浓度的±1%)与高空间分辨率(约1微米)结合起来。
TEN chondrites and two siderolites have been investigated, using electron-probe microanalysis to measure the concentration of nickel in the metallic phases. Information about the composition of the metal particles in chondrites is of value in deciding whether they were formedin situor by the accumulation of fragments of large metallic bodies. Conventional chemical analysis is limited to determining the average composition of the metal, owing to the smallness of the particles. Ringwood1measured the lattice parameters of the kamacite (α-nickel–iron) and tænite (γ-nickel–iron) in a number of chondrites, and deduced compositions from these measurements. It is preferable to use a more direct method of obtaining compositional information: electron-probe microanalysis has the advantage for this purpose of combining reasonable precision (± 1 per cent of the concentration measured) with high spatial resolution (about 1µ).