西昆仑西段铁矿地质特征对比及找矿模型研究

发布时间：2018-06-29 15:18

本文选题：西昆仑西段 + 铁矿床　；参考：《新疆大学》2017年硕士论文

【摘要】：本文从对铁矿床进行详细的野外地质调查及仔细研究开始,并结合前人在研究区已有的研究成果及室内系统分析的工作,对西昆仑西段铁矿成矿带区域地质背景和区内典型矿床矿区及矿床地质特征进行综合对比分析研究。在前述工作的基础上重点总结了研究区内铁矿床的控矿地质条件、找矿标志、成矿规律,并进行了区域找矿前景评价和探讨,指出了进一步的找矿方向和思路。本文通过对西昆仑西段铁矿带的研究,获得以下结论与认识:1、通过分析研究已有前人的基础资料将研究区区域构造进一步划分,并把研究区所在的塔什库尔干陆块划分为塔县一瓦恰隆起带、塔阿西一塔吐鲁沟火山一沉积盆地、塔合曼迪火山一沉积盆地等三个四级构造单元。其中,研究区内已发现的较大规模的磁铁矿床主要分布在塔阿西一塔吐鲁沟火山一沉积盆地之中,此盆地的形成和演化历史与区内磁铁矿床的成矿作用有紧密的关系。2、首次系统对比分析老并、赞砍、切列克其、孜洛依等典型铁矿床的地质特征、矿体形态、矿石类型、矿石结构构造,找矿标志、控矿因素、含矿地层和建造等矿床基本特征,找出他们的异同点。这些典型矿床具的相似的成矿地质背景。除了切列克其铁矿床,其他三个矿床成矿物质来源均与含矿地层布伦阔勒岩区变质岩有直接关系,而切列克其铁矿床成矿时代较晚,成矿物质来源与布伦阔勒岩群无直接关系。3、通过对研究区内磁铁矿矿床地质特征、微量元素地球化学、稀土元素地球化学、硫氧同位素等多方面进行综合研究,表明研究区内磁铁矿床成因类型为海相火山沉积型铁矿床,并且它的原始沉积是磁铁矿体的主体,而后期受到区域变质作用与岩浆热液改造作用的影响较为有限。4、建立了区内老并、赞砍、孜洛依、切列克其等典型矿床的成矿模式,认为它们均经过了以下三个成矿阶段:(1)沉积成矿阶段。(2)区域变质作用改造阶段。(3)岩浆热液改造阶段。其中,沉积成矿阶段是铁矿的主要形成阶段,而后期受到区域变质作用与岩浆热液改造作用的影响较为有限。5、通过分析研究区内地层、岩浆岩特征、构造、变质作用,岩相古地理等地质条件对区内铁矿床的控制和影响,概括了研究区铁矿的时空分布,成矿物质来源,以及矿物共生组合等区域成矿规律因素。并提出了研究区内铁矿床主要产于古元古代的布伦阔勒岩群地层和中上—志留统达坂沟群地层中,主要受地层层位和岩相古地理条件的控制。区内铁矿的成矿作用主要经历了三期的时间演化,其中,最早的成矿作用最为重要,区内磁铁矿主要在沉积成矿时期形成的,而后期的变质成矿作用与岩浆热液作用对区内铁矿的形成起到的作用有限。在空间上,区内铁矿床主要分布在沉积盆地的边缘地带,海底火山活动是区内磁铁矿的主要物质来源。6、初步评价了研究区内铁矿的找矿前景,并指出研究区内磁异常场特征显示较为复杂的正负磁异常组合与Fe、V、Ti、Co、Ni、Mn、Th、U、Mo等高值异常组合叠加的布伦阔勒群第二岩性段中的变质细(粉)砂岩,区内向斜的核部和背斜的转折端部位,孜洛依磁铁矿区的北部一带等地段为具有较好的成矿条件。
[Abstract]:In this paper, from the detailed field geological survey and careful study of the iron ore deposit, the regional geological background of the western Kunlun iron ore belt and the characteristics of the typical ore deposits and ore deposits in the western section of western western Kunlun are compared and analyzed. On the basis of the study, the ore control geological conditions of the iron deposits in the study area, the prospecting criteria, the metallogenic regularity, and the evaluation and discussion of the prospect of regional prospecting are carried out, and the further prospecting direction and thought are pointed out. The following conclusions and knowledge are obtained through the study of the western Kunlun iron ore belt: 1, the existing predecessors have been analyzed and studied. The basic data will further divide the regional structure of the study area, and divide the chagogan land in the study area into three four level tectonic units, such as the one tile basin of the tower County, the one tower of the pagoda, the pagoda volcano, the tower in the Mandy volcano basin and so on. Among them, the large scale magnetite deposits have been found in the study area. The formation and evolution history of this basin is closely related to the mineralization of magnetite deposits in the area of the tuuitu volcano basin of taga Asif, tasua. The formation and evolution of this basin have a close relationship with the mineralization of magnetite deposits in the region.2. The basic characteristics of ore marks, ore controlling factors, ore bearing strata and construction are found, and their similarities and differences are found. The similar metallogenic geological background of these typical mineral beds. In addition to the cherickeg iron deposit, the mineral origin of the other three deposits is directly related to the metamorphic rock in the blonk region of the ore bearing strata and the cherex iron deposit is mineralized. Later, the source of metallogenic material has no direct relation to the.3. Through the comprehensive study of the geological features of the magnetite ore deposit, trace element geochemistry, rare earth element geochemistry and sulfur oxygen isotope, the genesis of the magnetite bed in the study area is a marine volcanic deposit type iron deposit. Its original deposit is the main body of the magnet ore body, and the effect of regional metamorphism and magmatic hydrothermal transformation in the later period is limited.4. The metallogenic models of typical ore deposits in the region, such as the old and zanloi, ziluyi and chilex, have been established, and they have been considered as the following three metallogenic stages: (1) the sedimentary metallogenic stage. (2) regional metamorphism. (3) the phase of the transformation of magmatic hydrothermal fluid. Among them, the sedimentary metallogenic stage is the main formation stage of the iron ore. In the later period, the influence of regional metamorphism and magmatic hydrothermal transformation is limited.5. Through the analysis of the geological conditions of the inner layer, magmatic rock, tectonics, metamorphism and lithofacies palaeogeography in the study area, the iron deposits in the region have been analyzed. With the control and influence, the spatial and temporal distribution of iron ore in the study area, the source of metallogenic material, and the association of mineral symbiotic association are summarized, and it is suggested that the iron deposits in the study area mainly occur in the Palaeoproterozoic group of the Proterozoic and the middle upper Silurian Daka gully group, which are mainly stratigraphic and lithofacies palaeogeographic strips. The mineralization of the iron ore in the area mainly experienced three periods of time evolution. Among them, the earliest mineralization was the most important. The magnetite in the region was mainly formed during the deposition and mineralization period, while the later metamorphic mineralization and magmatic hydrothermal action played a limited role in the formation of the iron ore in the region. To be distributed in the marginal zone of the sedimentary basin, submarine volcanism is the main material source of magnetite in the region,.6, which preliminarily evaluates the prospecting prospect of iron ore in the study area, and points out that the characteristics of the magnetic anomaly field in the study area show the complex combination of positive and negative magnetic anomalies and the superimposed superposition of Fe, V, Ti, Co, Ni, Mn, Th, U, Mo, etc. The metamorphic fine (powder) sandstone in group second lithology section, the turning end of the inner inclined nucleus and anticline, and the northern area of the ziluilai magnetite mining area have better metallogenic conditions.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.31

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