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对于具有限混溶或原子有序分布的简单二元固溶体来说,已结合其自由能曲线来预测一种体系的相关系和出溶机理。有序过程的特征影响着出溶机理的适用性.如果有序化作用是二步(较高)有序时,则整个过程以连续机理占优势,而所描述的一种“条件旋节分解”(“Conditional spinodal”)(Allen 和 Cahni 1976)只有对序与无序端员组分之间起着决定作用.对于一步有序来说,有序相仅能经成核与生长来沉淀无序相.用透射电子显微镜所观察到的绿辉石徼细结构包括出溶页片和反相晶畴,并且在所选择的样品中它们之间的关系已用于解释地质条件下起控制作用的出溶机理。绝大多数绿辉石几乎都经历了阳离子的有序过程,然后保持均一体,或通过旋节分解作用出溶一种无序辉石。连续出溶机理占优势已用来说明 C2/c→P2/n 转换可以是二步(较高)有序的.现已提供了一种硬玉——普通辉石的可能相图,它是以这种理论为基础的,即在低温下无序端员组分之间应该是有限混溶的,而中间成分(绿辉石)的阳离子是有序的,两者迭加在一条溶相线上。这就完全解释了观察到的许多微细结构,并与在含杂质硬玉和绿辉石之间、绿辉石和钠辉石之间存在宽阔二相区的岩相学证据相符合。加入锥辉石所产生的影响类似于增温效应,所以,也就能够预测硬玉——锥辉石——普通辉石的相关系。
For simple binary solid solutions with limited miscibility or orderly distribution of atoms, the free energy curve has been used to predict the phase relationship and the dissolution mechanism of a system. The characteristics of an ordered process affect the applicability of the dissolution mechanism, and if the ordering is two-step (higher) order, then the whole process is dominated by a continuous mechanism, and the described “spinodal decomposition (”Conditional spinodal") (Allen and Cahni 1976) only play a decisive role between the ordered and the unorganized endmember components. For one-step ordering, the ordered phase can only precipitate by nucleation and growth The phase of the smectite structure observed with transmission electron microscopy includes the dissolution sheet and the inverting crystal domains and the relationship between them in the selected samples has been used to explain the role of control in geologic conditions The dissolution mechanism. Almost all omphacites undergo an orderly process of cationization, and then remain homogenous, or dissolve a disordered pyroxene by spinodal decomposition. The predominance of successive dissolution mechanisms has been used to illustrate that the C2 / c → P2 / n conversion can be two-step (higher) ordered. A possible phase diagram of jadeite-pyroxene has been provided, This theory is based on the idea that the misclassified endmember components should be limited miscibility at low temperatures and that the cation of the intermediate component (omphacite) is ordered and the two are superimposed on a single melt line on. This fully explains the many microstructures observed and is consistent with the petrographic evidence of the presence of broad two-phase zones between the jadeites and the omphacite that contain impurities. The effect of adding pyroxene is similar to that of warming, so the correlation between jadeite-pyroxene-pyroxene can also be predicted.