• 责任者：Li Zhihong (Laboratory of Isotope Geology ; MLR ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhu Xiangkun
• 刊名：Acta Petrologica Sinica
• 出版年：2012
• 卷期：28(11)
• 关键词：铁矿 ; iron ores ; 铁同位素 ; iron isotopes ; 辽宁 ; Liaoning Province
• 页码：p.3545-3558
• 图表：6 illus., 2 tables, 53 refs.
• 分类号：1001
• issnNo：ISSN1000-0569
• isbnNo：CN11-1922/P

The results of elemental and Fe isotopic composition of BIF from Anshan-Benxi area are reported. The average bulk compositions of iron ore are characterized by higher total Fe₂O₃ and SiO₂, and low contents of Al₂O₃ and TiO₂. The overall contents of trace elements and ∑REE are very low. The Shale-normalized REE patterns display LREE depletion, distinct positive anomalies of La, Eu, Y and high Y/Ho values. These features show that BIFs are chemical sediments devoid of detrital input and originated from hydrothermal fluids. Relative to IRMM-014, BIFs show heavy Fe isotope enrichment, implying that the Fe from hydrothermal source was only partially oxidized. The variations in Fe isotope compositions may be explained in terms of different degree of precipitation. The lack of Ce negative anomalies and the heavy Fe isotope enrichment of BIF demonstrate that the oxygen fugacity in the depositional environment was very low.