新疆阿尔泰南缘巴利尔斯铁矿床稀土元素地球化学研究

摘要

巴利尔斯铁矿是阿尔泰南缘麦兹盆地新近发现的中型铁矿床。赋存于上志留—下泥盆统康布铁堡下亚组第二岩性段变粒岩、浅粒岩及斜长角闪岩中，矿体及其周围发育大量矽卡岩矿物。本文对矿体围岩、矽卡岩矿物和矿石进行了稀土元素地球化学研究，结果表明磁铁矿矿石、矽卡岩与围岩斜长角闪岩的 REE 特征具有相似性，暗示磁铁矿矿石与矽卡岩具有亲缘性，斜长角闪岩可能提供部分成矿物质。矽卡岩和矿石发育Eu正异常及所有矿石的负Ce异常，表明铁成矿作用发生在高温氧化环境。%The Baliersi iron deposit is located in Maizi Basin on the southern margin of Altay orogenic belt. The ore bodies are hosted in the metamorphosed volcaniclastic-sedimentary rocks of the Upper Silurian-Lower Devonian Kangbutiebao Formation. The ore bodies are largely concordant with the bedding of the strata, and the wall rocks are amphibolite, leptynite and leptite. Abundant skarn minerals such as garnet, diopside, amphibole, epitote and chlorite are widely distributed around the ore bodies. The REE characteristics of skarn, magnetite ore and amphibolite are similar to each other, indicating that skarn and magnetite ore have close relationship, and amphibolite might have provided part of metallogenic materials. Skarn and most ores have obvious Eu positive anomalies and Ce negative anomalies, implying that mineralization took place at high temperature and in an oxidation environment.