Characteristics and significance of the Naxiguole BIF-type iron ore deposit in Qimantag Mountain, Qinghai Province
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摘要:
那西郭勒铁矿床位于青海省西部祁漫塔格成矿带,矿床特征与苏必利尔型BIF铁矿类似,是祁漫塔格成矿带近年来新发现的成矿类型。那西郭勒铁矿床产于古元古界,这在中国比较少见。该矿床的发现不仅丰富了中国铁矿成矿类型,带动了祁漫塔格乃至青海省铁矿的勘查,而且对于区域地质环境及构造演化研究具有重要意义。
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关键词:
- 苏必利尔型BIF铁矿 /
- 矿床特征 /
- 发现意义 /
- 祁漫塔格 /
- 青海
Abstract:The Naxiguole iron ore deposit lies in the Qimantag metallogenic belt in western Qinghai Province. The deposit is similar to the superior type BIF iron ore deposit, and it is a newly discovered metallogenic type deposit in the Qimantag metallogenic belt. On the basis of summarizing ore deposit geological background and deposit characteristics, the authors made a preliminary discussion on the significance of the discovery of this deposit. The Naxiguole iron ore deposit was formed in Lower Proterozoic, which is relatively rare in China. The discovery of the Naxiguole iron ore deposit not only enriches China's iron ore mineralization type and guides the iron ore exploration in Qimantag area and even in the whole Qinghai Province, but also has great significance for the study of regional geological environment and tectonic evolution.
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图 7 斜长角闪(片)岩Si-[(al+fm)-(c+alk)]图解(底图据参考文献[10])
Figure 7.
图 8 与铁矿互层的斜长角闪(片)岩的原岩恢复TAS图解(底图据参考文献[11])
Figure 8.
图 9 TiO2-MnO-P2O5判别图解(底图据参考文献[21])
Figure 9.
表 1 那西郭勒铁矿石化学分析结果
Table 1. Chemical analysis results of Naxiguole iron ore
% 岩石 斜长角闪片岩 斜长角闪岩 条带状石英-角闪石-磁铁矿 样品号 ZK4001-2 ZK7201-1 ZK2101-2 ZK1602-2 ZK4001-1 NXGL-T01Z02 NXGL-T02Z03 NXGL-T03Z04 NXGL-T04Z05 SiO2 47.72 49.05 49.57 55.20 49.52 45.49 46.15 37.34 44.84 TiO2 3.24 1.51 0.16 0.22 1.76 3.16 0.19 0.27 3.61 Al2O3 12.26 14.04 3.10 3.90 14.22 14.26 2.56 1.96 12.24 Fe2O3 1.18 1.14 5.98 16.03 3.60 8.10 24.86 37.33 6.80 FeO 13.99 9.41 8.75 12.34 8.95 7.70 11.68 15.77 10.35 MnO 0.23 0.17 0.34 0.37 0.19 0.23 1.47 0.25 0.29 MgO 5.50 7.46 12.03 2.52 6.57 6.04 3.73 1.02 7.29 CaO 9.89 10.89 16.83 3.61 9.75 9.73 5.30 1.98 10.28 Na2O 2.73 2.36 0.74 0.55 3.04 3.23 0.75 0.27 1.97 K2O 0.84 1.21 0.59 1.65 0.34 0.21 1.19 0.71 0.27 P2O3 0.28 0.15 0.22 0.68 0.17 0.17 0.65 1.09 0.14 烧失量 0.57 1.50 0.72 1.04 0.87 0.81 0.14 0.14 0.76 总计 98.43 98.88 99.02 98.09 98.98 99.13 98.67 98.13 98.84 表 2 BIF型铁矿石主量元素
Table 2. Major elements contents of Banded iron deposit
% 样品号 Al2O3 Fe2O3 FeO MgO CaO Na2O K2O P2O5 参考文献 氧化物相 Algoma 3 41.1 13 1.53 1.51 0.31 0.58 0.21 Lake Superior 1.39 44.5 8.2 1.24 1.58 0.12 0.14 0.06 硅酸盐相 Algoma 7.56 36.1 18.1 3.89 0.83 0.05 0.41 0.42 Lake Superior 2.41 26.7 16.3 2.73 2.4 0.2 0.63 0.1 [12] 碳酸盐相 Algoma 6.07 20 15 5.54 1.78 1.07 0.86 0.44 Lake Superior 1.4 28.5 21.2 4.54 5.12 0.15 0.15 0.15 硫化物相 Algoma 6.23 27.7 14.6 2.42 2.27 0.91 0.73 0.17 ZK2101-2 3.10 5.98 8.75 12.03 16.83 0.74 0.59 0.22 ZK1602-2 3.90 16.03 12.34 2.52 3.61 0.55 1.65 0.68 ZK4001-1 14.22 3.60 8.95 6.57 9.75 3.04 0.34 0.17 条带状石英-角闪石-磁铁矿 NXGL-T01Z02 14.26 8.10 7.70 6.04 9.73 3.23 0.21 0.17 本文 NXGL-T02Z03 2.56 24.86 11.68 3.73 5.30 0.75 1.19 0.65 NXGL-T03Z04 1.96 37.33 15.77 1.02 1.98 0.27 0.71 1.09 NXGL-T04Z05 12.24 6.80 10.35 7.29 10.28 1.97 0.27 0.14 平均 7.46 14.67 10.79 5.60 8.21 1.51 0.71 0.45 表 3 沉积变质型铁矿类型对比[20]
Table 3. The contrast of sedimentary-metamorphic iron ore deposit types
判别标志 阿尔戈马型 苏必利尔型 那西郭勒铁矿 含铁建造类型 与超基性、基性火山岩-火山沉积岩联系紧密 与碎屑岩-碳酸盐岩联系紧密 与基性火山岩联系密切 构造环境 岛弧、弧后盆地或扩张大洋中脊附近 被动大陆边缘,大陆架浅海环境,克拉通内部盆地 扩张大洋中脊附近 矿物相 主要为磁铁矿物相 具明显的相分带,可见磁铁矿、碳酸盐和赤铁矿(镜铁矿)相 主要为磁铁矿物相 变质变形 绿片岩相-角闪岩相变质,混合岩化较强 一般为绿片岩相,混合岩化不明显 绿片岩相-低角闪岩相变质 -
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① 青海省地质矿产开发局. 青海省矿产资源潜力评价报告. 2014.