吉林省红旗岭矿区基性-超基性岩体稀土元素地球化学特征

摘要

Base on the study of basic-ultrabasic rocks mass REE geochemical characteristics in Hongqiling area, the REE distribution pattern of metallogenic rock body is a mode of right-leaning light rare earth enrichment type, and Eu has obvious negative anomaly- no abnormality (δEu=0.74~1.12), and the REE eigenvalues are similar. These indicate that the metallogenic rock body in Hongqiling area is formed in the same period of tectonic magmatic activity, and has same magma source. The REE distribution type of barren intrusion is same as ore rock, but Eu shows no abnormality-positive abnormality(δEu=0.90~1.56), Pr shows a positive anomaly(δPr=1.00~1.35). In the mining area, the REE abundance of metallogenic rock mass is relatively large (the value ofδEu andδPr≤1.00), and that of barren intrusion is relatively small(the value ofδEu andδPr≥1.00), which can be used as the rock geochemical signs for the judgment of metallogenic rock mass and barren intrusion.%红旗岭矿区基性—超基性岩体稀土元素地球化学特征研究表明，成矿岩体REE配分模式均呈右倾的轻稀土富集型，铕具较明显的负异常→无异常（δEu＝0.74～1.12），并且各岩体稀土元素特征值具有相似性，表明矿区内成矿岩体形成于同一期构造岩浆活动，岩浆来源具有同源性。无矿岩体REE配分模式亦均呈右倾的轻稀土富集型，铕表现为无异常→正异常（δEu＝0.90～1.56），镨表现为正异常（（δPr＝1.00～1.35），明显有别于成矿岩体。矿区内成矿岩体与无矿岩体在稀土元素地球化学特征某些方面具有比较明显的差别，主要表现在成矿岩体稀土元素丰度变化范围相对较大，δEu和δPr值以≤1.00为主，无矿岩体稀土元素丰度变化范围相对较小，δEu和δPr值以≥1.00为主，可作为矿区判断成矿岩体与无矿岩体岩石地球化学标志。