新疆西天山式可布台铁矿成矿规律及成因浅析

发布时间：2018-05-08 13:13

本文选题：式可布台铁矿 + 地球化学　；参考：《新疆大学》2015年硕士论文

【摘要】：铁矿是新疆的优势矿产资源之一,不仅分布广,类型齐全,而且富矿比例也较大,已探明储量居西北五省区第二位。国内26个主要铁矿成矿区带之一的新疆西天山成矿带,位于西天山造山带内。西天山阿吾拉勒铁铜成矿带现已被确定为国家十个大型的重要金属矿产资源接替基地中的一个。式可布台铁矿就地处在西天山阿吾拉勒成矿带的西侧之内,成矿条件比较好,成因类型十分典型,是阿吾拉勒成矿带上非常有代表意义的一个铁矿床。本文以式可布台铁矿为研究对象,用矿床学、构造地质学、岩石地球化学、岩石矿物学、同位素年代学等作为理论基础,通过总结分析矿床地质、岩石地球化学、物化探等方面的特点来对式可布台铁矿展开系统的研究,从而用以分析成矿条件、建立成矿模式,总结找矿标志,最终探讨确定矿床成因。成矿规律研究表明:LA-ICPMS锆石U-Pb定年分析结论表明研究区内火山岩同位的素年龄在301到313Ma这一范围内,说明在晚石炭世早期便产出了式可布台铁矿的火山岩。该铁矿的铁矿床是在火山的沉积时期产生的:在火山活动晚期,喷出的物质绝大多数是火山气液,喷出物中蕴藏着数量巨大成矿元素和挥发物质,飘落至海水后,在海水的还原环境下和海水中的元素相互组合,组成黄铁(铜)矿等。研究发现区内矿化蚀变和矿体的产生或赋存,不存在任何联系,底层是否含矿在岩石的蚀变作用中一样毫无任何的影响。在物质来源方面稀土配分的模式和它的特征参数都存在一定的规则可寻,发现铕的异常较为突出,并存在着轻稀土的富集,重稀土弱亏损,从而很好的说明了式可布台铁矿的成矿物质来源可能是来自上地幔也可能是来自地壳的深部。从包裹体成分分析可以看出,海底喷流热水-沉积的方式影响着该矿床的成矿。氢氧同位素特征可以看出式可布台铁矿矿床的成矿流体当中参杂有海水且主要都来自于岩浆水。通过对与式可布台铁矿相邻近的两个典型矿床进行类比分析研究,归纳了研究区周边搜寻这种火山—沉积型铁矿的找矿标识。通过此次研究可以更有针对性的布置工作,为后续勘查部署奠定了基础。式可布台铁矿矿床的成因:根据成矿物理化学条件,岩浆岩地球化学特征以及结合区域地质资料分析可以看出式可布台铁矿床成因种类属海相火山喷流、热液沉积型。式可布台铁矿床属火山-沉积型铁矿床。成矿规律和矿床成因的研究,是进一步找矿和预测的基础。通过对式可布台典型矿床的研究,会较大的丰富西天山阿吾拉勒成矿带上铁矿床基础地质问题的研究,提高矿床勘查研究水平,对进一步找矿实践、扩大找矿前景具有理论和实际意义。
[Abstract]:Iron ore is one of the dominant mineral resources in Xinjiang. It not only has a wide distribution, complete types, but also has a large proportion of rich minerals. The proven reserves are the second in the five provinces of Northwest China. The West Tianshan metallogenic belt of Xinjiang, one of the 26 major iron ore metallogenic belts in China, is located in the West Tianshan orogenic belt. The West Tianshan Awoulal Iron and Copper metallogenic Belt has been identified as one of the ten major bases for the replacement of important metallic mineral resources in the country. Xiekebutai Iron Mine is located in the west side of the Awulale metallogenic belt in the West Tianshan Mountains. The ore-forming conditions are relatively good and the genetic types are very typical. It is a representative iron ore deposit in the Awulale metallogenic belt. In this paper, the ore deposit geology, geochemistry, rock geochemistry, petromineralogy, isotopic chronology and so on are used as the theoretical basis, and the ore deposit geology and rock geochemistry are summarized and analyzed. The characteristics of geophysical and geochemical exploration are used to analyze the ore-forming conditions, to establish metallogenic models, to summarize the prospecting criteria and to determine the genesis of the ore deposits. The results of U-Pb dating of zircon indicate that the isotopic age of volcanic rocks in the study area ranges from 301 to 313Ma, indicating that the volcanic rocks of the type Kebutai iron deposit were produced in the early late Carboniferous. The iron ore deposit of this iron ore deposit was formed during the period of volcanic deposition: in the late period of volcanic activity, the vast majority of the material emitted was volcanic gas and liquid, which contained a large amount of ore-forming elements and volatile materials, which fell to the sea water. Huang Tie (copper) ore is formed by the combination of elements in seawater and the reduction environment of sea water. It is found that there is no relation between mineralization alteration and the occurrence or occurrence of orebodies in the region. In terms of material source, the pattern of rare earth partition and its characteristic parameters can be found. It is found that the anomaly of europium is more prominent, and there is enrichment of light rare earth and weak depletion of heavy rare earth. It is shown that the source of ore-forming material may come from the upper mantle or from the deep crust. It can be seen from the composition analysis of inclusions that the ore-forming of the deposit is influenced by the way of submarine jet hot water and sedimentation. The characteristics of hydrogen and oxygen isotopes can be seen that the ore-forming fluid in the ore-forming fluid of Feboutai iron deposit is composed of seawater and mainly comes from magmatic water. Based on the analogical analysis of two typical ore deposits adjacent to the facies of the type Kebutai iron deposit, the prospecting marks for searching for this type of volcanic-sedimentary iron ore in the periphery of the study area are summarized. Through this study, we can lay a foundation for further exploration and deployment. Genesis of Xiekebutai iron deposit: according to metallogenic physical and chemical conditions, geochemical characteristics of magmatic rocks and analysis of regional geological data, it can be seen that the genetic types of Febutai iron deposit are marine volcanic exhalation and hydrothermal sedimentary type. It belongs to volcanic-sedimentary iron deposit. The study of metallogenic regularity and genesis is the basis of further prospecting and prediction. Through the study of the typical ore deposits in Xiakopoutai, the study on the basic geological problems of the iron ore deposits in the Awulale metallogenic belt of the West Tianshan Mountains will be enriched, and the level of exploration and study of the deposits will be improved, and further prospecting practice will be carried out. Expanding the prospecting prospect is of theoretical and practical significance.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.31

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