赵蓓蓓, 韦文国, 李彪, 陈丽伟. 冀东松木庄BIF铁矿床地质特征及成因探讨[J]. 中国矿业, 2022, 31(S2): 196-198,207. DOI: 10.12075/j.issn.1004-4051.2022.S2.027
    引用本文: 赵蓓蓓, 韦文国, 李彪, 陈丽伟. 冀东松木庄BIF铁矿床地质特征及成因探讨[J]. 中国矿业, 2022, 31(S2): 196-198,207. DOI: 10.12075/j.issn.1004-4051.2022.S2.027
    ZHAO Beibei, WEI Wenguo, LI Biao, CHEN Liwei. Geological Characteristics and Genesis of Songmuzhuang Iron Deposit ofEastern Hebei Province[J]. CHINA MINING MAGAZINE, 2022, 31(S2): 196-198,207. DOI: 10.12075/j.issn.1004-4051.2022.S2.027
    Citation: ZHAO Beibei, WEI Wenguo, LI Biao, CHEN Liwei. Geological Characteristics and Genesis of Songmuzhuang Iron Deposit ofEastern Hebei Province[J]. CHINA MINING MAGAZINE, 2022, 31(S2): 196-198,207. DOI: 10.12075/j.issn.1004-4051.2022.S2.027

    冀东松木庄BIF铁矿床地质特征及成因探讨

    Geological Characteristics and Genesis of Songmuzhuang Iron Deposit ofEastern Hebei Province

    • 摘要: 前寒武纪条带状(BIF)铁矿是我国最为重要的铁矿类型,冀东地区是国内重要铁矿开采基地之一。松木庄铁矿位于冀东迁安北部,是一大型铁矿床,也是该区最为典型的BIF铁矿。铁矿体赋存于太古界迁西群三屯营组二段变质岩地层中。矿体围岩以混合花岗岩、黑云角闪斜长片麻岩为主。矿体呈似层状,产状与围岩基本一致。矿石结构主要为粒状变晶结构,构造主要为条纹状、条带状、片麻状。矿物成分简单。金属矿物以磁铁矿为主,少量假像赤铁矿。脉石矿物以石英、紫苏辉石和普通辉石为主,少量角闪石、石榴石、透辉石和黄铁矿等,蚀变矿物有绿泥石和方解石等。元素组合分析结果显示(CaO+MgO)/(SiO2+Al2O3) =0.12<0.5,矿石属于酸性矿石。光谱分析结果显示,矿石中其它元素含量低微。矿床矿石矿物较简单,推测松木庄铁矿可能由于海底火山喷发,携带大量硅铁质,以沉积方式成矿,后经区域变质作用使硅铁富集而成,磁铁石英岩形成时的铁质来源,应与火山活动有关。综上所述,木庄铁矿属于鞍山式沉积变质铁矿。

       

      Abstract: The Precambrian banded iron formation (BIF) is the most important iron deposit type in the world. Eastern Hebei is one of the most important iron ore provinces in China. The Songmuzhuang iron deposit, located at Qian’an, is a large and typical BIF-type iron deposit. The Songmuzhuang iron ore is located in the north of Qian"an in Eastern Hebei Province. It is a large iron ore deposit and the most typical BIF iron ore in this area. The iron ore body occurs in the metamorphic rock strata of the second member of the santunying formation of the Qianxi group of the Archaean. The surrounding rock of the ore body is mainly migmatite and biotite hornblende plagiogneiss. The ore body is bedlike, and the occurrence is basically consistent with the surrounding rock. The ore structure is mainly granular and crystalloblastic structure, and the structure is mainly striped, banded and gneissic. The mineral composition is simple. The metal minerals are mainly magnetite and a small amount of false hematite. Gangue minerals are mainly quartz, perilla pyroxene and augite, with a small amount of amphibole, garnet, diopside and pyrite. Altered minerals include chlorite and calcite. The results of element combination analysis show that (CaO + MgO) / (SiO2 + Al2O3) = 0.12 < 0.5, and the ore belongs to acid ore. According to spectral analysis, the content of other elements in the ore is low. The ore minerals of the deposit are relatively simple. It is speculated that the songmuzhuang iron mine may be formed by the submarine volcanic eruption, carrying a large amount of siliceous iron, which is formed by sedimentation, and then enriched by regional metamorphism. The iron source during the formation of magnetite quartzite should be related to volcanic activities. To sum up, Muzhuang iron ore belongs to Anshan type sedimentary metamorphic iron ore.

       

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