【摘要】 综述了国际上对岩浆绿帘石的研究成果,总结了岩浆绿帘石的特征及其在花岗质岩浆中的结晶行为,讨论了岩浆绿帘石的地质意义。岩浆绿帘石的稳定与岩浆成分、fH2O以及fO2关系密切。它通常作为中、高压近固相线结晶矿物,主要产于英云闪长岩、花岗闪长岩、花岗岩等钙碱性花岗质岩石中。该矿物在岩浆中的结晶可早可晚(相对于黑云母或角闪石),氧逸度的高低直接影响到它在岩浆中的最小稳定压力。作为早期结晶的矿物,绿帘石不能作为压力计来反映岩体侵位深度,因为在绿帘石晶出时,岩浆中液相体积在50% ~80%,这样岩浆可能会有快速侵位的过程,但它的地质意义在于能够对岩浆上升速率做出估算。而晚期近固相线晶出的绿帘石时,能够作为压力计反映岩体最小侵位深度。据此可以应用于对地壳演化和隆升的研究。由于氧逸度对绿帘石的稳定有很大影响,因此在能够作为压力计时,首先需要确定岩浆氧逸度情况。通常磁铁矿型花岗岩最小侵位深度在3×108 Pa左右(10km),而钛铁矿型为5×108 Pa以上(17~20km)。更多还原

【Abstract】 Recent advances and geological significance of magmatic epidote（MEp） are summaried in this article. MEp stability in magma is firmly correlated with temperature, pressure, fH₂O and fO₂. Crystallization sequence from magma of MEp depends on pressure but not fO₂ . while,fO₂ can changes MEp minimum cystallization pressure from 5×10⁸ Pa(fO₂=NNO)to 3×10⁸ Pa(fO₂=HM). MEp which crystallized earlier than biotite or hornblende in the magma, can not be used as a barometer, but be useful in caculating the ascent speed of magma. Those MEp that occurred as subsolid mineral with or without resorption of earlier-formed hornblende, can be use as pressure indicator for intrusion. With respect to the influence of fO₂, Granite can be subdivided into Magnetite and Ilmenite series. MEp that occurred in Magnetite series granite indicates the minimum pressure of 3kbar and 5kbar of Ilmenite series granite.更多还原