Geochemical Characteristics and Genesis of BIF Iron Deposit in Guocheng Town, Haiyang City, Shandong Province
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摘要: 郭城镇条带状铁矿（BIF）位于胶莱盆地东北缘，赋存于古元古代荆山群变质岩中。通过与冀东迁安和山西五台地区的铁矿对比，可以看出郭城铁矿地球化学特征主要为化学沉积，但有一定量的碎屑参与。在后澳大利亚太古宙页岩（PAAS）稀土配分图中，轻稀土元素亏损、高的Y/Ho值以及La和Y正异常的特征表明铁矿沉淀于海相环境，而高的Sr/Ba、Ti/V值以及Eu的强烈正异常表明火山热液的参与，成矿物质来源于火山活动。无明显的Ce负异常，表明当时可能存在一个缺氧的大气环境。根据矿石及围岩的氢氧同位素值特征，可以看出其成矿作用流体的类型为混合岩化型热液。Abstract: The banded iron formation (BIF) of Guocheng town is located in the northeastern margin of Jiaolai Basin, which was occurred in metamorphic rocks of Proterozoic Jingshan group. After comparing with the iron deposits in Qian'an area of East Hebei and Wutai area of Shanxi, it's found that Guocheng iron deposit was formed by chemical sedimentary, with certain amount of involved debris. In the REE distribution diagram of Post-Australian Archean Shale (PAAS), this deposit has depleted LREE, with high Y/Ho ratio and positive La-Y anomalies, indicating that this deposit was precipitated in the marine environment. The high Ti/V ratio and strong Eu positive anomaly stand for the participation of volcanic hydrothermal fluid. Thus, it's believed that the metallogenic material was derived from the volcanic activity. There was no obvious negative Ce anomaly, indicating that there might be an anoxic atmosphere at that time. The hydrogen and oxygen isotopes of ore and surrounding rock indicate that the ore-forming fluids not only sourced from volcanic hydrothermal solution, but also from other fluids.
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