【摘要】 五台山地区是中国典型的太古宙条带状铁建造发育区。系统的稀土、微量元素地球化学研究结果表明,本区条带状铁建造稀土元素组成与北美页岩相比,具明显的正铕异常,HREE相对富集,而Zr、Ba、Sr、Pb等属酸性岩类强烈富集的不相容元素,相对于上陆壳明显亏损,结合现代海底热流沉积地球化学的研究成果,认为本区条带状铁建造为古海底热流化学沉积作用的产物,其形成与五台山地区太古宙基性火山活动密切相关。更多还原

【Abstract】 The Wutaishan (Wutai Mountains) area is a typical region developed with Archean banded iron-formations (BIF) in China. Systematic studies of the characteristics of REE and trace elements show that all kinds of BIF in this region have significant Eu positive anomalies, higher HREE contents in comparison to NASC, and are depleted in incompatible elements like Zr, Ba, Sr and Pb in contrast with the upper continental crust of the earth. Combining the results from the former study of the geochemistry of modern submarine hydrothermal deposition, it can be concluded that BIFs in this region were derived from the chemical deposition of palaeo-submarine hydrothermal system closely related to the basic volcanic activity in the Archean.更多还原