【摘要】 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。更多还原

【Abstract】 Plagioclase is one of the most important rock-forming minerals and plays a significant role in the evolution of magmas. High temperature and high pressure experimental studies can be employed to constrain the conditions and to explore the kinetics of plagioclase crystallization. In recent years, many investigators have experimentally studied the crystallization of plagioclase. These studies help us better understand the conditions for plagioclase crystallization as well as magma crystallization processes. The present review systematically summarizes the experimental studies on plagioclase crystallization in the following aspects:(1) restricting factors on plagioclase crystallization(including the effects of melt composition, temperature, pressure and H2 O content on the crystallization of plagioclase). Melt composition can affect the liquidus temperature of plagioclase and the An content of crystallized plagioclase; temperature can affect the nucleation and growth, composition and morphology of plagioclase; the effect of pressure on plagioclase crystallization is complex; H2 O content can significantly lower the crystallization temperature of plagioclase and can determine the crystal size;(2) the application of plagioclase crystallization experimental studies in interpreting magma processes. By studying the composition, texture and crystal size of plagioclase, changes of physical and chemical conditions during the evolution of magmas can be determined.更多还原