安徽南部庐枞盆地小包庄铁矿的矿床地质特征
发布时间：2018-09-12 20:24
【摘要】：小包庄铁矿位于长江中下游成矿带庐枞火山岩盆地中,是近几年来新发现的又一大型玢岩型铁矿床。小包庄铁矿在空间上位于罗河铁矿的下部,形成了两个矿床上下叠覆的模式。本文以小包庄铁矿为主要研究对象,以罗河铁矿为补充,在收集整理和总结了前人研究的基础上,进行了详细的野外地质调查,通过岩相学、矿相学、电子探针分析、主微量元素分析、硫同位素分析以及流体包裹体研究,探讨了小包庄铁矿的成因、成矿物质来源、成矿流体的演化以及小包庄铁矿与罗河铁矿的关系。测试结果显示,小包庄铁矿磁铁矿矿石中不同成矿阶段形成的黄铁矿、硬石膏的δ34S值异常高,黄铁矿的δ34S值集中在6‰~15‰的范围内,硬石膏的δ34S值集中在16‰~24‰的范围内,并且随着成矿期次由早到晚、深度由深到浅,黄铁矿、硬石膏的δ34S值逐渐降低,同时测得小包庄铁矿下部三叠纪东马鞍山组膏岩层的δ34S值为30.1‰,反映了小包铁矿中的硫有膏盐层的加入。包裹体测温结果表明,小包庄铁矿透辉石-磁铁矿-硬石膏化蚀变阶段、绿帘石化蚀变阶段、碳酸盐-硬石膏-黄铁矿化蚀变阶段和硬石膏-石英-黄铁矿化蚀变阶段的成矿流体温度分布区间分别为326~496℃、259~317℃、178~280℃和107~189℃,盐度分布区间分别为14%~21%NaCl eqv、11%~20%NaCleqv、6%~16%NaCleqv、2%~13%NaCleqv,成矿流体经历了从高温高盐度向低温低盐度演化的过程。从成矿岩体、矿体特征、矿石特征、蚀变分带特征以及成矿温度等方面与罗河铁矿进行对比表明,小包庄铁矿与罗河铁矿应为两个同一类型的独立矿床,其在空间上上下叠覆的模式可能是由闪长质岩浆在不同深度侵位而形成的。
[Abstract]:Xiaobuzhuang iron deposit is located in the Luzong volcanic basin of the middle and lower reaches of the Yangtze River metallogenic belt. It is another large porphyrite type iron deposit newly discovered in recent years. Xiaobuzhuang iron deposit is located in the lower part of Luohe iron deposit in space, forming the superimposed model of two deposits. In this paper, taking Xiaobuzhuang Iron Mine as the main research object and Luohe Iron Mine as the supplement, on the basis of collecting, arranging and summarizing the previous studies, detailed field geological survey was carried out, and the petrographic, mineralogical and electron probe analysis were carried out. The main trace element analysis, sulfur isotope analysis and fluid inclusion study, the origin of Xiaobaozhuang iron deposit, the origin of ore-forming material, the evolution of ore-forming fluid and the relationship between Xiaobuzhuang iron deposit and Luohe Iron Mine are discussed. The test results show that the 未 34S value of anhydrite is unusually high, the 未 34S value of pyrite is concentrated in the range of 6 鈥，
本文编号：2240129
[Abstract]:Xiaobuzhuang iron deposit is located in the Luzong volcanic basin of the middle and lower reaches of the Yangtze River metallogenic belt. It is another large porphyrite type iron deposit newly discovered in recent years. Xiaobuzhuang iron deposit is located in the lower part of Luohe iron deposit in space, forming the superimposed model of two deposits. In this paper, taking Xiaobuzhuang Iron Mine as the main research object and Luohe Iron Mine as the supplement, on the basis of collecting, arranging and summarizing the previous studies, detailed field geological survey was carried out, and the petrographic, mineralogical and electron probe analysis were carried out. The main trace element analysis, sulfur isotope analysis and fluid inclusion study, the origin of Xiaobaozhuang iron deposit, the origin of ore-forming material, the evolution of ore-forming fluid and the relationship between Xiaobuzhuang iron deposit and Luohe Iron Mine are discussed. The test results show that the 未 34S value of anhydrite is unusually high, the 未 34S value of pyrite is concentrated in the range of 6 鈥，
本文编号：2240129
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