山东齐河—禹城地区李屯富铁矿床地球化学特征及地质意义
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本文为国家重点研发计划项目(编号:2017YFC0602201)和山东省煤田地质局科研专项奖励基金项目\[编号:鲁煤地科字(2019)3号\]的成果


Geochemical characteristics and geological significance of Litun iron ore deposit in Qihe—Yucheng area,Shandong Province
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    摘要:

    李屯铁矿为近年在山东省齐河—禹城地区发现的隐伏富磁铁矿床,为空白区地质找矿新发现。本文通过详细野外调查、室内镜下观察及地球化学分析测试,对矿床地质、地球化学特征进行了系统研究,初步揭示矿床成因。磁铁矿体赋存于李屯岩体与石炭纪—二叠纪地层接触带附近的砂泥岩地层内。李屯铁矿中岩体微量元素分配模式具有较好的一致性,均不同程度地富集Rb、Ba、Sr等大离子亲石元素,亏损Zr、Nb、Ta等高场强元素,磁铁矿石中富集大离子亲石元素Sr,亏损K;高场强元素富集U、P、Hf、Ta,亏损Nb、Ti。岩体与磁铁矿石稀土元素均表现出轻稀土富集、重稀土亏损的右倾型配分模式。李屯铁矿形成于岩石圈大规模快速减薄期,成矿构造背景应为板块伸展扩张环境。李屯岩体的岩浆来源为壳幔混源,尖晶石相二辉橄榄岩发生部分熔融产生的的岩浆熔体;成矿物质来源于深源岩浆及其形成的岩浆岩。磁铁矿成矿与李屯岩体关系密切,矿床成因类型应是接触交代型矽卡岩铁矿床。

    Abstract:

    The Litun iron ore deposit is a hidden magnetite deposit discovered in Qihe—Yucheng area, Shandong Province in recent years, this is a new geological prospecting discovery in the blank area of iron ore. The depth of the ore body is more than 1000 meters, but the ore grade is very high, it has a good prospect and research value.Methods: In this paper, the geological and geochemical characteristics of ore deposits are systematically studied through detailed field investigation, indoor microscopic observation and geochemical analysis. The near- ore and far- ore magmatic rocks and typical ore samples were collected in the Litun deposit, and the main, trace and rare earth elements were analyzed. The equipments used to test the main elements are Axios max and Axios PW 4400 X- ray fluorescence spectrometer, X Serise 2 and ELANDRC- e ICP- MS were used for the trace and rare earth elements.Results: Magnetite bodies are hosted in sand and mudstone strata near the contact zone between Litun rock mass and carboniferous — Permian strata. The distribution model of trace elements in rock mass of Litun iron ore deposit has a good consistency, with enrichment of large ion lithophile elements (LILEs) Rb, Ba, Sr, etc., and loss of high field strength elements (HFSEs) Zr, Nb, Ta, etc. The magnetite ore is rich in the element Sr and lost K(LILEs),rich in U, P, Hf, Ta, and lost Nb, Ti(HFSEs). The rare earth elements in rock mass and magnetite ore show a right- leaning distribution model of light rare earth enrichment and heavy rare- earth loss. Conclusions: The litun iron ore deposit was formed during the large- scale and rapid lithospheric thinning period, and the metallotectonic background should be plate extensional setting. The magmatic source of Litun rock mass is crust—mantle mixed source and magmatic melt produced by partial melting of spinel phase lherzolite. The metallogenic material is derived from the deep source magma and magmatic rocks it formed. Magnetite mineralization is closely related to Litun rock mass, the genetic type of the deposit is contact metasomatic skarn iron deposit.

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沈立军,朱裕振,王怀洪,李双,高志军,张心彬,周明磊.2021.山东齐河—禹城地区李屯富铁矿床地球化学特征及地质意义[J].地质论评,67(1):84-97,[DOI].
SHEN Lijun, ZHU Yuzhen, WANG Huaihong, LI Shuang, GAO Zhijun, ZHANG Xinbin, ZHOU Minglei.2021. Geochemical characteristics and geological significance of Litun iron ore deposit in Qihe—Yucheng area, Shandong Province[J]. Geological Review,67(1):84-97.

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  • 收稿日期:2020-04-15
  • 最后修改日期:2020-12-08
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  • 在线发布日期: 2021-01-19
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