| 马程,陆茂欣,李通,汪栋刚,何庆志,马风华,王成,马立荣.宁夏卫宁北山地区热液型铁矿地球化学特征及成矿物质来源研究[J].矿产勘查,2026,17(7):1165-1176 |
| 宁夏卫宁北山地区热液型铁矿地球化学特征及成矿物质来源研究 |
| Study on geochemical characteristics and sources of ore-forming materials of hydrothermal iron ore in Weining Beishan area, Ningxia |
| 投稿时间：2025-02-24 |
| DOI：10.20008/j.kckc.202607004 |
| 中文关键词: 宁夏卫宁北山 铁矿床 地球化学特征 成矿物质来源 陆源 |
| 英文关键词: Weining Beishan area, Ningxia iron deposit geochemical characteristics source of ore sub-stances terrestrial sources |
| 基金项目:本文受宁夏自然科学基金项目(2023AAC03770)、2023年度宁夏回族自治区青年科技托举人才培养项目和中国矿产地质志项目(DD20221695、DD20190379、DD20160346)联合资助。 |
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| 中文摘要: |
| 卫宁北山地区现已发现诸多铁矿床，本文选取 11处分布于卫宁北山不同地理位置的具有相同地质特征的铁矿床进行地球化学特征研究，以期确定其成矿物质来源。研究区铁矿床赋矿围岩为石炭系前黑山组、臭牛沟组、靖远组及羊虎沟组地层。矿石主量元素 Al2O3、K2O和 P2O5平均含量为 4.06%、0.56%、0.08%，且 SiO2/Al2O3＜5，K2O＞Na2O。铁矿石、赋矿围岩与围岩中铁质结核稀土元素球粒陨石标准化配分图总体上呈现出轻稀土相对富集，重稀土相对亏损，铈、铕异常基本一致，且稀土配分曲线变化整体一致，说明铁矿石的形成与赋矿围岩和铁质结核有相关性。铁矿石 Co/Ni比值平均 0.32，Zr平均含量 83.18×10-6，Sc平均含量 11.28×10-6Th平均含量 5.92×10-6Ti含量为 0.01%～0.08%，变化范围很小且稳定；Y/Ho平均值 27.55； 0.88。地球化学特体显示出研究区铁矿床成矿物质来源于陆源，是经后期热液活动富集，在构造破碎带中发生物理化学条件变化，赋存在构造变形的扩容空间。同时也说明成矿物质与岩浆岩或岩浆热液关系甚远并且后期热液活动提供的成矿物质也极为有限，并未改变成矿物质具有较为Sr/Ba平均值，征总，典型的陆源特征的特点。 |
| 英文摘要: |
| Many iron deposits have been found in Weining Beishan area. In this paper, 11 iron deposits withthe same geological characteristics distributed in different geographical locations of Weining Beishan area are se-lected to study their geochemical characteristics in order to determine their mineral sources. The surrounding rocksof the iron deposits in the study area are Carboniferous Qianheishan Formation, Chouniugou Formation, JingyuanFormation and Yanghugou Formation. The average content of main elements Al2O3, K2O and P2O5 is 4.06%, 0.56% and 0.08%, and SiO2/Al2O3<5, K2O>Na2O. On the whole, the standardized chondrite partition map of rare earth ele-ments in iron ore, ore-endowed surrounding rock and surrounding rock shows relative enrichment of light rare earthelements, relative loss of heavy rare earth elements, and the anomaly of cerium and europium is basically the same,and the change of rare earth partition curve is consistent, indicating that the formation of iron ore is related to theore-endowed surrounding rock and iron nodules. The average Co/Ni ratio of iron ore is 0.32; Zr content averaged83.18×10-6; Sc content averaged 11.28×10-6; Th content averaged 5.92×10-6; the content of Ti is 0.01%-0.08%, andthe variation range is small and stable. Y/Ho mean 27.55; the average Sr/Ba value is 0.88. The geochemical charac-teristics generally show that the ore-forming materials of the iron ore deposits in the study area come from terrig-enous sources, are enriched by late hydrothermal activities, have changed physical and chemical conditions in thestructural fracture zone, and exist in the expansion space of structural deformation. At the same time, it also showsthat the ore-forming materials are very far related to magmatic rocks or magmatic hydrothermal, and the ore-forming materials provided by late hydrothermal activities are very limited, which does not change the characteris-tics of the ore-forming materials with more typical terrigenous characteristics. |
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