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(四)具一个不一致熔融二元化合物位于自身初相区外的三元近结系分析及关于反应点的一般规律例如白榴石—钙长石—二氧化硅即属于此种类型(图18)。在相图上首先画出表示温度下降方向的箭头,大多数边界线是析出曲线,白榴石和钾长石之间的边界线是反应曲线,用双箭头表示之。因为钾长石的成分点位于它自身初相区之外,所以钾长石与钙长石之间的边界线不和它们两者成分点的连接线相交。
(D) An analysis of ternary near-knots with an inconsistent melting binary compound located outside its own initial phase region and general rules on reaction sites such as leucite-andalusite-silica are of this type (Figure 18 ). On the phase diagram, first an arrow is drawn that indicates the direction of the temperature drop. Most of the boundary lines are precipitation curves. The boundary between leucite and potash feldspar is the reaction curve, indicated by double arrows. Because the compositional point of K-feldspar lies outside its own initial facies, the boundary between K-feldspar and anorthite does not intersect the connecting line between the two component points.