云南老王寨金矿区煌斑岩稀土地球化学特征

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，虽然碱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休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

REE Geochemistry of Lamprophyres in the Laowangzhai Gold Orefield, Yunnan Province

Lamprophyres, which are widely distributed in the Laowangzhai gold orefield, Yunnan Province, and closely related to gold mineralization in time and space, can be divided into the kinds including the fresh(weakly altered), the altered and the mineralized. The kinds of lamprophyres in the roefield are similar in the range of RE contents and the RE patterns, but definitely different in the parameters of LRE/HRE, N La/Yb ect The features of RE geochemistry of fresh lamprophyres show that rocks were the products with different degrees of partial melting of enriched mantle. The calculated results of REE activity regularity in the process of alteration and mineralization of lamprophyres in the orefield show that the altered fluids and mineralized fluids contain RE, and these fluids mainly are the products of mantle degassing and magma degassing during lamprophyric magmatism.