广泛分布于云南老王寨金矿区的煌斑岩可分为新鲜(弱蚀变)、蚀变、矿化三种,虽然三种煌斑岩稀土含量范围、分配模式为相似的富轻稀土型,但在LRE/HRE、NLa/Yb等参数也存在一定的差异.新鲜煌斑岩稀土地球化学研究表明,本区煌斑岩为富集地幔不同部分熔融程度的产物; 煌斑岩蚀变、矿化过程中稀土元素活动规律的质量平衡计算结果表明,该区煌斑岩的蚀变流体和矿化流体均含有一定量的稀土元素,这些流体主要为伴随煌斑岩岩浆活动过程中的地幔去气作用和岩浆去气作用的产物.
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