铁同位素体系及其在矿床学中的应用_王跃.pdfVIP

1000-0569 / 2012 /028 (11)-3638-54 Acta Petrologica Sinica 岩石学报 * 铁同位素体系及其在矿床学中的应用 ＊＊ 王跃 朱祥坤 WANG Yue and ZHU XiangKun ＊＊ ， ， 100037 中国地质科学院地质研究所国土资源部同位素地质重点实验室 大陆构造与动力学国家重点实验室 北京 Institute of Geology ，CA GS ，Laboratory of Isotop e Geology ，MLR ;State Key Laboratory f or Continental Tectonics and Dynamics ，Beij ing 100037 ，China 20 12-05-10 收稿，20 12-08-10 改回. Wang Y and Zhu XK. 2012. Fe isotope systematics and its implications in ore deposit geology. Acta Petrologica Sinica ，28 (11):3638 － 3654 Abstract On the basis of Fe isotope compositions of different Fe-bearing minerals worldwide reported in this paper ，together with literature data ，Fe isotope distributions of different minerals and reservoirs ，as well as different types of deposits ，were summarized in some detail ，which provide a reference framework of Fe isotope system. Applications of Fe isotope system in the study of ore deposits were reviewed. Fe isotope fractionation occurs during fluid exsolution and that fluid is enriched in light isotopes relative to stock. In a hydrothermal fluid system ，iron isotopes fractionate during fluid evolution due to precipitation of Fe-bearing minerals. Precipitation of Fe (III)minerals leaves the remaining fluid enriched in light isotopes ，while precipitation of Fe (II)minerals makes the Fe isotopic composition of the fluid progressively heavier. Precipitation of Fe-bearing minerals results in the Fe isotope composition of residual fluids evolving with time. Fe isotopes potentially serve to identify precursors in ore alteration products. The high-T altereation minerals are enriched in heavy isotopes relative to precursors ，while the low-T alteration minerals inherit the composition of precursors throughout.