The newly discovered Shanzhuang BIF is hosted in the Shancaoyu Formation of the Taishan Group within the Eastern Block, southeastern margin of the North China Craton. The ores can be subdivided into three types in terms of mineral assemblages, corresponding to three types (I, II, III). The element concentration of the type I magnetite is similar to that of the type II magnetite, while the type III magnetite is similar to that of the schist. In general, magnetite and hematite grains from the ores show high concentrations of Mn (1317, 1162 ppm), Co (787, 1023 ppm), Al (2224, 2435 ppm) and Ti (540, 300 ppm), Whereas magnetite is depleted in Si (420 ppm) and hematite enriched in Si (1690 ppm). Detailed petrographic and mineral chemical analysis of magnetite, hematite, amphibole/hornblende and pyroxene, reveals that almost all the minerals occur as subhedral‐anhedral grains with pits and fractures, and the BIF is recrystallized to metamorphic assemblages of high amphibolite facies. Hornblende is highly enriched in Fe, Mg and Ca, but depleted in K and Na, mostly belonging to magnesiohornblende. In addition, the ratios of Mg/(Mg+Fe²⁺), Fe³⁺/(Fe³⁺+Fe²⁺), Si/(Si+Ti+Al) and Al/Si are 0.48–0.64, 0.17–0.36, 0.79–0.88 and 0.14–0.27, respectively. It is suggested that hornblende is neither a typical magmatic origin nor a typical metamorphic. Pyroxene has the characteristics of high Ca and Fe, but low Ti and Al, with end‐member components En, Wo and Fs in the ranges of 25.22–28.64 wt%, 43.71–46.40 wt% and 24.51–27.62 wt%, respectively, belonging to clinopyroxene, and mostly diopside, might be formed during the prograde metamorphism in the absence of H₂O. The carbonate such as dolomite‐ankerite series is probably a precursor mineral of the BIF deposit. Mass mineral chemical and structural characteristics indicate that the Shanzhuang iron deposit has been subjected to varying degrees of oxidized hydrothermal superimposed reformation, metamorphism, and supergenesis after mineralization, during which some elements have been migrated in some degree.

中文翻译：

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华北克拉通东南缘山庄带状铁层的组织学和矿物学研究：对矿化后热液蚀变和超生作用的叠印历史的启示

新发现的山庄BIF位于华北克拉通东南缘东部地块东段的泰山集团山草ca组。根据矿物组合，矿石可分为三种类型，分别对应三种类型（I，II，III）。I型磁铁矿的元素浓度与II型磁铁矿的元素浓度相似，而III型磁铁矿与片岩的元素浓度相似。通常，矿石中的磁铁矿和赤铁矿晶粒显示出高浓度的Mn（1317，1162 ppm），Co（787，1023 ppm），Al（2224，2435 ppm）和Ti（540，300 ppm）。 Si（420 ppm）和赤铁矿中富含Si（1690 ppm）。磁铁矿，赤铁矿，闪石/角闪石和辉石的详细岩石学和矿物化学分析，揭示了几乎所有矿物都以具有凹坑和裂缝的亚面-面反面晶粒出现，并且BIF重结晶为高闪石相的变质组合。Hornblende的铁，镁和Ca含量很高，而K和Na的含量却很低，主要属于镁镁合金。另外，Mg /（Mg + Fe²⁺），Fe ³⁺ /（Fe ³⁺ + Fe 2 ⁺），Si /（Si + Ti + Al）和Al / Si分别为0.48-0.64、0.17-0.36、0.79-0.88和0.14-0.27。建议角闪石既不是典型的岩浆成因，也不是典型的变质作用。辉石的特征是高Ca和Fe，而Ti和Al低，端部组分En，Wo和Fs的范围分别为25.22-28.64 wt％，43.71-46.40 wt％和24.51-27.62 wt％，缺乏H ₂的顺性变质过程中可能会形成属于clinopyroxene且主要为透辉石的化合物O.碳酸盐，例如白云石-马来石系列可能是BIF矿床的前驱矿物。大量矿物化学和结构特征表明，山庄铁矿床在矿化后经历了不同程度的氧化热液叠加重整，变质作用和超生作用，在此过程中某些元素已发生一定程度的迁移。