| 河南窑场铁矿床地球化学特征及其地质意义 |
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| 引用本文：ZHANG DongYang, SU HuiMin, QIN Song,TIAN Lei,CHEN Yuan.2009.Geochemistry of Yaochang iron deposit in Henan Province and its geological implications[J].Mineral Deposits,28(3):321~335 |
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| 基金项目:中国地质大学（北京）大学生课外科技项目和创新性试验计划项目 |
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| 中文摘要:通过对窑场铁矿床围岩和矿石的地球化学分析，得出本区条带状硅铁建造可能与海相火山沉积物有关，属于前寒武纪火山沉积变质型铁矿床范围，可进一步划分为火山岩-中酸性杂砂岩-硅铁质沉积建造。流体包裹体测温结果表明，含矿围岩中的包裹体均一温度集中在220～340 ℃之间，矿石中包裹体均一温度峰值为220～300 ℃，成矿流体具有低盐度〔（w（NaCleq）为0.88%～11.34%）〕、低密度（0.66～0.99 g/cm3）特征。由激光拉曼探针分析可知，石英中气液包裹体具有较复杂的气液相成分，显示除水外，还具有较强还原性物质成分的特征峰值，表明整个成矿过程均处于还原环境。窑场铁矿床经历了前期含硅铁沉积物的沉积阶段和后期的区域变质作用阶段，变质成矿流体发生了不混溶现象，对成矿元素的富集起到一定的促进作用。 |
| 中文关键词:地球化学 流体包裹体 铁矿床 前寒武纪 窑场 河南 |
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| Geochemistry of Yaochang iron deposit in Henan Province and its geological implications |
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| Abstract:The Yaochang iron deposit is located in Lushan area of Henan Province and geotectonically on the southern margin of the North China Platform. Systematic chemical analyses of wall rocks and ores indicate that the banded ferrosilicic formation might have been related to marine volcanic-sedimentary volcanic rocks, and the ore deposit probably belongs to the Precambrian volcanic_sedimentary metamorphic iron deposit. The banded ferrosilicic formation can be further classified as the volcanic_intermediate acid graywacke_ferrosilicic sedimentary formation. The homogenization temperatures of fluid inclusions show a peak at 220～340 ℃ for the wall rock and 220～300 ℃ for the ore, and the ore_forming fluids have low salinity（0.88%～11.34%）and low density （0.66～0.99 g/cm3）. The gas and liquid components of fluid inclusions are dominated by H2O and also characterized by the presence of some characteristic peaks of such reducing substances as H2S and CH4, suggesting a reducing environment. It is thus held that the Yaochang iron deposit underwent the ferrosilicic sedimentary deposition stage followed by further enrichment during the late regional metamorphic process. In the late stage, the metamorphic fluids from the original homogeneous metamorphic ore_forming solution resulted in immiscibility and hence the enrichment of ore_forming elements. |
| keywords:geochemistry, fluid inclusion, iron deposit,Precambrian Yaochang, Henan |
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