能量约束下的同化混染与分离结晶作用模型(EC-AFC)在超镁铁质岩浆演化过程中的应用——以含铜镍硫化物矿床的四川力马河岩体为例

除极少数情况外,岩浆的演化过程基本为开放体系.AFC模型(同化混染+分离结晶)是模拟岩浆演化过程的经典方法.事实上,岩浆演化过程不仅和围岩有物质交换还存在能量的交换,因此由Spera和Bohrson提出的能量约束下的开放系统岩浆演化过程的同化混染与分离结晶(EC-AFC)模型更加符合地质实际,本文介绍了该模型的方法,在此基础上,以含铜镍矿床的四川力马河岩体为例,运用EC-AFC模型模拟该岩体的岩浆演化过程.结果表明,EC-AFC模型能很好的模拟该岩体的开放系统中岩浆演化过程；Sr同位素的EC-AFC模拟曲线表明岩浆很可能在中下地壳发生混染,岩浆与发生混染的围岩在成分上都具有不均一性.

Application of energy-constrained assimilation-fractional crystallization(EC-AFC) model for ultramafic magmatic systems:A case study of the Limahe intrusion associated with Cu-Ni sulfide ores,Sichuan Province

Magma evolution is an open-system process in many cases with some exceptions.AFC(assimilation-fractional crystallization) model is a 'classical' approach for modeling magma evolution.In fact,there are not only material exchange between magma system and its wall rocks,but energy exchange as well.Therefore the energy-constrained assimilation-fractional crystallization(EC-AFC) model developed by Spera and Bohrson for magma evolution in an open-system is more suitable for nature systems.In this paper,we introdu...