The influence of high pressure on transformation equilibria in iron meteorites
The influence of high pressure on transformation equilibria in iron meteorites
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高压对铁陨石相变平衡的影响
DOI：
10.1016/0016-7037(62)90024-8
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发表时间：
1962
影响因子：
5
通讯作者：
L. Kaufman
中科院分区：
文献类型：
--
作者：
A. .. Ringwood;L. Kaufman
作者以前曾计算过高压下铁镍合金的α-γ相变平衡相图。本文利用H.H.嗯铁陨石的结构是在30-60毫巴的压力范围内形成的。新的50毫巴图解表明，Widmanstatten结构形成的时间间隔小于108年，从而解决了目前铁陨石高压和低压结晶的争论，并考虑了次要组分，主要是磷，对结晶平衡的影响。陨石中通常含有少量的磷，但这并不足以改变二元铁镍平衡，从而改变主要结论。然而，磷对α相的稳定作用可以解释陨石状铁纹石比高压或低压二元Fe-Ni相图预期的镍含量略高的事实。
Phase diagrams for the α-γ transformation equilibria in iron-nickel alloys at high pressures have previously been calculated by the authors. The phase compositions and structures of iron meteorites are discussed in terms of the high pressure diagrams, using arguments which were first advanced by H.H. Uhlig. It is concluded that the structures of iron meteorites were developed within the pressure range 30–60 kilobars. The new 50 kilobar diagram permits the time interval for formation of the Widmanstatten texture to be less than 108years, thus resolving a current controversy between advocates of high pressure and low pressure crystallization for iron meteorites.The influence of minor components, principally phosphorus, on the crystallization equilibria is also considered. The small amounts of phosphorus usually occurring in meteorites do not change the binary Fe-Ni equilibrium sufficiently to modify the principal conclusions. However, the stabilizing effect of phosphorus on the α phase may account for the fact that meteoritic kamacite is slightly richer in nickel than would be expected from either the high pressure or the low pressure binary Fe—Ni phase diagram.