Geochemical Characteristics and Genetic Study of Mokaer Magnetite Deposits in the Taxkorgan Area, Xinjiang
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摘要: 莫喀尔磁铁矿床位于新疆塔什库尔干县马尔洋乡，目前，矿区内共发现11条磁铁矿带（长940~3 800 m，厚2~150 m）及4条磁铁矿化带（长150~240 m，厚2~12 m）；矿体均呈透镜状、层状产于元古宙布伦阔勒岩群中，矿体围岩为斜长角闪岩、黑云母斜长片麻岩、黑云石英片岩，矿体顶、底板岩性与矿体夹石一致，矿体与围岩为渐变接触关系。莫喀尔矿区铁矿石稀土元素总体上呈轻稀土富集的右倾型，具有弱的Ce正异常，富集U、La、Pb、Pr、Sm、Nd，亏损Ta、Sr、Ti、Zr、Hf；磁铁矿TFeO含量为99.08%~99.64%，平均为99.35%。赋矿围岩及矿石、磁铁矿地球化学特征显示该矿床具有沉积变质型铁矿的特征，同时也显示了矿床遭受了后期的热液改造，且在成矿过程中可能有相当比例的陆源碎屑物质混入。Abstract: Mokaer magnetite deposit is located in Maeryang Township, Taxkorgan County, Xinjiang. Thereare11 magnetite belts(940~3 800m long and 2~150m thick) and 4 magnetite mineralization belts(150~240m long and 2~12m thick) have been found in the deposit. The ore bodies occur in the Proterozoic Bulunkuole Group, and the ore bodies are in gradual contact with the surrounding rocks. The ore bodies are mostly controlled by plagioclase amphibolite, biotite plagioclase gneiss and biotite quartz schist. The rare earth elements in ores in this deposit are generally of right-leaning type and enriched with light rare earth elements, with weak positive Ce anomalies, enriched with U, La, Pb, Pr, Sm, Nd, and depleted with Ta, Sr, Ti, Zr and Hf. The Fecontent of magnetite is 99.08% to 99.64%, with an average of 99.35%. Geochemical characteristics of wall rocks, ores and magnetite show that the deposit has the characteristics of sedimentary metamorphic iron ores, and that the deposit has been subjected to later hydrothermal reformation and mixed with a considerable proportion of terrigenous clastic materials.
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