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由de la Ronche 和他的同事提出的多阳离子图划分了不同构造环境的花岗质岩石的成分。该图表明,花岗质岩石在一个造山旋回从始到终有系统的变化,最终导致形成碱性岩浆。根据矿物成分向量分析研究了形成岩浆可能的来源物质和机制。这些研究说明,一些花岗质岩系是由两个阶段的作用形成的。首先,单斜辉石、橄榄石和钙质斜长石从拉斑玄武质的基性源中分离结晶形成一种中性成分的岩浆。这种岩浆再间或受到长英质岩浆混染,继而原地分离形成花岗质岩系中的独立侵入体。
The polycation diagram proposed by de la Ronche and colleagues classifies the composition of the granitic rocks in different tectonic settings. The figure shows that the granitic rocks systematically vary throughout a volcanic orogeny, eventually leading to the formation of alkaline magma. Based on the mineral composition vector analysis, the possible source materials and mechanism of magma formation are studied. These studies show that some of the granitic rocks formed by the role of two stages. First, clinopyroxene, olivine and calcareous plagioclase separate and crystallize from the base source of basalt basalt to form a magma of neutral composition. This magma is again interbedded with the felsic magma and subsequently separated to form independent intrusions in the granitic series.