热水喷流沉积铁矿床铁同位素地球化学研究：以新疆莫托萨拉铁矿床为例

热水喷流沉积铁矿床是一类重要的铁矿类型，受到越来越多的重视。铁同位素示踪技术的发展为这类铁矿床的研究提供了新的思路和手段。本项目拟开展新疆莫托萨拉铁矿床系统的铁同位素地球化学研究。通过对莫托萨拉矿床地质剖面上的系统采样并进行铁同位素分析测试，查明铁同位素组成在矿体的垂向和横向空间上的分布规律；结合地质地球化学指标（如岩性、Ce异常、氧同位素等），分析铁同位素变化的控制因素及铁同位素的分馏机制。从而初步查明以莫托萨拉矿床为代表的热水喷流沉积铁矿的铁同位素地球化学特征，构筑热水喷流成矿过程的铁同位素演化模型。本项目的研究也可以为其他相关矿床，如前寒武条带状铁建造和石禄铁矿的成因机制研究提供指导和参考。

Recently, more and more attention has been paid to the hydrothermal sedimentary iron deposit, an important type of iron deposit. The development of iron isotope geochemistry provides new insights for studying this type of iron deposit. The iron isotope investigation of Motuosala iron deposit in Xinjiang province will be carried out in this project. Based on systematic sampling along geological across sections in the deposit and iron isotope measurements, spatial distribution characteristics of iron isotopes will be got; Integrated with other geological and geochemical parameters such as ore type, oxygen isotope, Ce anomaly, etc., the mechanism of the iron isotope fractionation during the ore-forming process will be understood. This is a critical preliminary step to obtain the iron isotope compositions and the isotope behavior for hydrothermal sedimentary iron deposit. The results of this study will also provide new insights into the genesis of the banded iron formation and the Shilu ore deposit in Hainan province.