东准噶尔卡拉麦里成矿带金矿多源信息成矿预测

发布时间：2018-02-26 22:39

本文关键词： 卡拉麦里金矿多源信息成矿预测　出处：《新疆大学》2015年硕士论文　论文类型：学位论文

【摘要】：新疆东准噶尔卡拉麦里成矿带位于西伯利亚板块和准噶尔板块缝合部位,深大断裂构造较为发育,属于卡拉麦里-莫钦乌拉成矿带,金矿成矿地质条件优越,具有形成大型金矿床的潜力,是新疆重要的金及多金属成矿带。本文以双泉金矿和库布苏金矿作为典型金矿床,研究其成矿地质特征,总结控矿因素。研究区内金矿化受断裂构造控制明显,发育在断裂构造密集区及断裂附近部位。研究区内地层具有成矿专属性,90%以上的金矿点均分布于泥盆系及石炭系地层中,二者均具有较高的金背景值。金矿化分布受热液活动范围控制,通常发育在岩体的外接触带上。结合典型金矿床的研究,收集了研究区内1:20万区域地质资料、1:20万化探资料及ETM+遥感资料。在ArcGIS平台下建立空间数据库,进行集成并统一。对遥感影像进行了几何校正、图像融合、图像镶嵌、图像裁剪和图像增强等处理后,结合区域地质图建立地质类要素集。主要包括沉积(火山)岩、侵入岩、蚀变岩、地质界线、断层、矿点等要素。对航磁数据及化探数据正态分布化处理后,进行空间插值建立物化探类要素集。通过单因素与成矿的关系研究,确定断层距离、地层、Au元素地球化学异常为主要影响因子;断层密度、与侵入岩体距离(热液活动范围)为次要影响因子;As元素地球化学异常、航磁数据为非影响因子不参与综合评价。在Arc GIS平台下,依据影响因子对成矿的有利度大小赋予不同权重值。基于栅格图层对各影响因子进行重分类及栅格计算。栅格像元值越大越有利于成矿。依据对多源信息的综合分析,最终圈定5处成矿潜力区分别为:清水成矿潜力区、双泉成矿潜力区、苏吉泉东成矿潜力区、库布苏成矿潜力区、北塔山成矿潜力区。其中清水成矿潜力区及北塔山成矿潜力区已定为金、铜普查区,并开展了相关工作。
[Abstract]:The Karamaili metallogenic belt in eastern Junggar, Xinjiang, is located at the suture site of Siberian plate and Junggar plate. The deep fault structure is relatively developed and belongs to the Karameli-Mochin Ula metallogenic belt, and the ore-forming geological conditions of gold deposits are superior. It is an important gold and polymetallic metallogenic belt in Xinjiang. In this paper, Shuangquan gold deposit and Kubusu gold deposit are used as typical gold deposits to study their metallogenic geological characteristics. The ore-controlling factors are summarized. The gold mineralization in the study area is obviously controlled by the fault structure, and developed in the area of concentrated fault structure and near the fault. More than 90% of the gold deposits with metallogenic specificity in the study area are distributed in the Devonian and Carboniferous strata. Both of them have higher gold background value. The distribution of gold mineralization is controlled by the range of hydrothermal activity and usually developed in the outer contact zone of rock mass. The 1: 200 000 geochemical data and ETM remote sensing data of the 1:20 regional geological data in the study area were collected. The spatial database was established under the ArcGIS platform to integrate and unify the remote sensing images. The geometric correction, image fusion and image mosaic of the remote sensing images were carried out. After image clipping and image enhancement are processed, the geological elements are set up in combination with the regional geological map. They mainly include sedimentary (volcanic) rock, intrusive rock, altered rock, geological boundary, fault, etc. After the normal distribution of aeromagnetic data and geochemical data is processed, the geophysical and geochemical exploration elements set is established by spatial interpolation. The fault distance is determined by studying the relationship between single factor and mineralization. Geochemical anomaly of au element in strata is the main influencing factor, fault density and distance from intrusive rock mass (range of hydrothermal activity) are secondary influencing factors of geochemical anomaly of element as. Aeromagnetic data are non-influential factors and do not participate in comprehensive evaluation. Under the Arc GIS platform, According to the influence factors, the influence factors are reclassified and calculated based on the grid layer. The larger the grid pixel value is, the more favorable the mineralization is. Based on the comprehensive analysis of the multi-source information, Finally, five metallogenic potential areas are delineated as follows: clear water metallogenic potential area, Shuangquan metallogenic potential area, eastern Sujiquan metallogenic potential area, Kubusu metallogenic potential area, etc. North Tashan metallogenic potential area, in which clear water metallogenic potential area and North Tashan metallogenic potential area have been designated as gold and copper survey area, and relevant work has been carried out.
【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】：P618.51

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