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斜长石是岩浆岩中最主要的造岩矿物之一,它在岩浆演化过程中扮演着重要角色。通过高温高压实验途径可以确定斜长石在岩浆中的结晶条件、探讨斜长石的生长动力学。近年来,较多学者对斜长石的结晶作用进行了实验研究,这些研究对理解斜长石的结晶条件和岩浆的结晶过程都有重要意义。本文从以下两个方面对斜长石结晶作用的实验研究做了系统的总结:(1)斜长石晶体的生长及其制约因素,包括熔体组分、温度、压力和H2O含量等条件对斜长石结晶的影响。熔体组分能够影响斜长石的液相线温度及结晶斜长石的An含量;温度对斜长石的成核生长、成分以及形态均有影响;压力对斜长石成核生长的影响比较复杂;H2O含量能够显著降低斜长石的结晶温度,影响结晶斜长石的晶体大小。(2)斜长石结晶作用实验研究的地质应用。对结晶斜长石成分、结构、晶体大小的研究,能够揭示岩浆在其演化过程中物理化学条件的变化。
Plagioclase is one of the most important rock-forming minerals in magmatic rocks, and plays an important role in the evolution of magma. Through high-temperature and high-pressure experiment, the crystallization conditions of plagioclase in magma can be determined and the growth kinetics of plagioclase can be discussed. In recent years, more scholars have carried out experimental studies on the crystallization of plagioclase. These studies are of great significance for understanding the crystallization conditions of plagioclase and the crystallization process of magma. This paper systematically summarizes the experimental study on the crystallization of plagioclase from the following two aspects: (1) The growth of plagioclase crystals and its restraining factors, including the conditions of melt composition, temperature, pressure and H 2 O Effect of plagioclase crystallization. Melt composition can affect the liquidus temperature of plagioclase and the An content of plagioclase; temperature has an impact on the nucleation, composition and morphology of plagioclase; the effect of pressure on the plagioclase nucleation and growth Complex; H2O content can significantly reduce the plastication temperature of plagioclase, affecting the crystal size of crystalline plagioclase. (2) The geological application of experimental study on the crystallization of plagioclase. The study on the composition, structure and crystal size of crystalline plagioclase can reveal the changes of physicochemical conditions during its evolution.