岩矿测试2012，Vol.31Issue(6)：1077-1087,11.
新疆西天山查岗诺尔铁矿床稳定同位素特征及其地质意义
Stable Isotopic Characteristics of the Chagangnuoer Iron Deposit in Western Tianshan, Xinjiang and Its Geological Significance
摘要
Abstract
Situated in the Awulale metallogenic belt of Western Tianshan, the large-sized Chagangnuoer magnetite deposit is contained within volcanic-sedimentary rocks of the Carboniferous Dahalajunshan Formation. According to ore fabrics and mineral assemblages, the mineralization events of this deposit were divided into the magmatic stage and the hydrothermal stage ( including the prograde sub-stage). Due to the lack of studies in ore deposit geochemistry for this deposit, this paper aimed to conduct systematic stable isotope analyses of C, O and S by isotope mass spectrometry method for minerals of magnetite, pyrite, chalcopyrite and calcite chosen from variousdisplayed depletion of light REEs relative to high REEs. Most samples had positive La anomalies. All samples have distinct positive anomalies of Eu and Y. All the evidence suggests that Magnetite was derived from submarine high temperature hydrothermal fluids and sea water in the studied area. The lack of clear negative Ce anomalies in all samples indicates that magnetite was formed in an anoxic ocean, although the Ce/Ce* ratios were 0. 69 -0. 97. The high grade iron ore has higher concentrations of total REEs and Eu than the low grade iron ore. The upper iron ore body, which hosted high grade iron ore, also had higher anomalies of Eu, which indicates more outstanding characteristic of hydrothermal fluid. It is suggested that the high grade iron ore was formed by hydrothermal activities from low grade iron ore.关键词
铁矿/西天山/查岗诺尔/稳定同位素/成矿物质来源Key words
magnetite/ rare earth elements/ Inductively Coupled Plasma-Mass Spectrometry/ sedimentarymetamorphic iron deposit/ Gongchangling分类
天文与地球科学引用本文复制引用
洪为,张作衡,李凤鸣,刘兴忠..新疆西天山查岗诺尔铁矿床稳定同位素特征及其地质意义[J].岩矿测试,2012,31(6):1077-1087,11.基金项目
国家重点基础研究发展计划(973计划)项目(2012CB416803) （973计划）
国家科技支撑计划项目(2011BAB06B02-05) （2011BAB06B02-05）
中国地质调查局地质矿产调查评价项目(1212011085060) （1212011085060）
