| 许英霞.冀东司家营铁矿床富矿成矿条件研究[J].地质与勘探,2014,50(4):675-688 |
| 冀东司家营铁矿床富矿成矿条件研究 |
| Metallogenic conditions of high-grade ores in the Sijiaying sedimentary metamorphic iron deposit, eastern Hebei Province |
| 投稿时间：2014-03-14 修订日期：2014-06-18 |
| DOI： |
| 中文关键词: 沉积变质型铁矿床 富铁矿 成矿条件 冀东 |
| 英文关键词: Sedimentary metamorphic iron deposit, high-grade ore, Metallogenic conditions, eastern Hebei |
| 基金项目:国土资源部公益性行业科研项目：冀东地区沉积变质型铁矿富矿控矿条件及科学基地研究（201111002-04）资助 |
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| 中文摘要: |
| 根据野外勘查，对冀东司家营铁矿床的普通矿石和富铁矿石进行了岩相学、主量元素、微量元素和稀土元素的研究。富铁矿顺层产于贫矿体中，富铁矿石颗粒与贫铁矿相比稍粗，主要由磁铁矿及铁闪石组成，部分铁闪石蚀变为绿泥石，表明司家营铁矿床的富铁矿矿石的形成与后期热液活动密切相关。司家营铁矿床不同矿石的主量元素分析结果表明，富矿石较普通矿石的石英含量减少，镁铁质矿物含量相对增加，所有矿石中MnO/TFe2O3比值极低，含量变化于0.001～0.01之间，平均值为0.002，指示了矿石的热水沉积成因。普通矿石和富铁矿石的微量元素和稀土元素配分模式有较好的一致性，表明不同类型矿石成矿物质来源可能相同。与磁铁矿普通矿石相比，赤铁矿普通矿石和富铁矿矿石的∑REE+Y含量更高，稀土元素配分曲线相比较更加平缓。造成赤铁矿普通矿石∑REE+Y含量增高和稀土元素配分曲线平缓的原因可能是赤铁矿距离地表较近，遭受后期淋滤作用。关于富铁矿矿石稀土元素∑REE+Y含量最高和稀土元素配分曲线平缓的原因，除了铁质沉积物更易吸收稀土元素外，后期变质热液蚀变也是非常重要的因素。 |
| 英文摘要: |
| Based on field surveys, this work has made analyses of petrography and major and trace elements of low- and high-grade ores in the Sijiaying iron deposit in eastern Hebei. High-grade ore beds were produced in low-grade ore bodies. The particle of high-grade ore is coarser than the low-grade ore, which is mainly composed of magnetite and grunerite. Some grunerites are altered to chlorite, indicating that high-grade ore is related to later hydrothermal activity. Major elements of different ores of Sijiaying indicate that quartz content of high-grade ore is less than low-grade ore, whereas mafic minerals are more than low-grade ore. The values of MnO/TFe2O3 are extremely low (0.001~0.01, mean=0.002), indicating the hydrothermal sedimentary ore genesis. The trace elements and REEs distribution patterns of the high-and low-grade ore are identical, indicating that they might come from the same sources. High-grade ores and hematite-bearing low-grade ores show higher ∑REE+Y content and gentler REE patterns than magnetite-bearing low-grade ores. The geochemical characters of hematite-bearing low-grade ores are caused by leaching at surface in the late time. The geochemical characters of high-grade ores can be attributed to excellent absorption capacity for REEs of iron-bearing sedimentary as well as metamorphic hydrothermal alteration in the later period. |
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