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哀牢山地区金多金属矿产资源预测研究
中文摘要

近年来,矿产资源勘查面临新形势,找矿工作的重点转向以深部矿为主,尤其在勘探程度较高的地区。因此,如何提取和发掘深层次的成矿信息成为矿产资源预测工作成败的关键。在这种情况下,利用综合信息预测理论,整合多源地学数据,通过信息转换归纳成矿因素,就可以提出新的靶区,从而开展多个矿种的矿产资源预测,开发新的矿产资源潜力显得格外重要。 本文的工作区哀牢山造山带地处云南省中南部,是西南三江地区最重要的金多金属成矿带之一,也是新一轮地质找矿工作部署包括的重点找矿区带之一。哀牢山地区已逐渐形成我国西部地区重要的金多金属矿产基地。 哀牢山构造带经历过多次强烈构造运动,以及经常性的岩浆活动,并经历了多次变质。地质条件决定了研究区的成矿具有多期次的特点。地质及构造环境决定哀牢山成矿带具有良好的成矿条件,区内矿产资源类型丰富多样,不乏大规模及超大规模矿床。哀牢山地区的基础地质和成矿研究都是国内外学者们关注的热点。近年来已发现了墨江金厂金镍矿,镇沅老王寨和冬瓜林金矿,元阳大坪金多金属矿床等大规模矿床,尽管如此,研究区的资源潜力仍然非常巨大。找寻新的矿点已成为目前本区矿业发展的重要任务,这也是本论文的主要研究目的。 一、从地质资料分析:哀牢山地区对成矿作用影响最大的地层为下元古界深变质岩系。断裂构造以NW、NS走向居多,NS向构造穿切NW向构造,将哀牢山成矿带分为东西两半。研究区内伴随构造运动发生多期次岩浆岩活动,金成矿带的集中分布性主要表现在几乎所有的金矿床点都分布在哀牢山浅变质岩带中,并且处于区域性九甲-安定深大断裂的上盘次级断裂构造中。 二、对航磁数据进行向上40㎞、20㎞、10㎞、5㎞高度的延拓,用以判别不同延深的地质体,对四个方向的水平一阶求导和垂向二阶求导,以研究区内构造、地层、侵入岩等金的成矿条件,对研究区构造格架进行总结,得出若干NW向断裂构造控制金多金属矿成矿。通过圈定隐伏岩体,得出NW向基底控制盖层展布的结论。 三、运用泛里格法对研究区1:20万水系沉积物数据进行处理。得出区内金多金属元素密集区。全区共圈出金异常37个,异常在区内成群、成带分布。哀牢山金成矿带金、铜元素分带同基底边缘控制有关,一般在岩体内的基底范围发育。因此,在北西接触带发育金、铜异常。铅、锌、银异常在东南接触带发育。以岩体为中心,形成不对称元素分带特点。 四、以综合信息成矿预测理论为指导,对研究区圈定的靶区进行矿产资源评价工作。结合成矿信息对靶区进行预测单元的划分,37个预测单元中7个为已知单元。通过特征分析对统计单元进行成矿有利度及定位评价。综合评价出哀牢山地区金矿找矿的重点预测单元25处,指出3、8、16号预测单元为寻找金矿最重要远景区;20、24、26、27、28、29、31、36号预测单元具有一定的找矿前景,可以作为后续找矿工作的重点单元;1、2、4、5、10、12、13、17、18、19、21、23、31、 34、35号预测单元与前两组单元相比成矿有利度较低,需要做进一步的勘查工作,可以作为勘查工作的远景储备单元。 五、运用逻辑信息法和蒙特卡洛法对研究区进行定量预测。逻辑信息法得出的规模及成矿单元结论与定位预测的结果相符;通过蒙特卡洛法的计算结果得出哀牢山地区金矿产资源量90%的概率为1868.1t,大于4167.4t可能不超过10%,50%概率下最大的资源量为3017.7t,为研究区下一步找矿工作的深入开展提供了理论支持。 关键词:哀牢山,矿产资源预测,地质变量,地球化学组合求异,定位预测,定量预测

英文摘要

In recent years, mineral resources prospecting faced the new situations. The key work of exploration is how to extract and delineate the new and deep ore-forming information. In this situation, the metallogenic prediction based on synthesis information, which integrated the multi-source geological data, is the best way for the new target lodge and to develop the potential prediction mineral resources. On this method, various prospecting issues can be worked out and turned to the factors of mineralization. As a conclusion, the new targets are delineated so that the multiple types of minerals and develop the new potential minerals. The working area Ailaoshan orogenic belt is located to the central south in Yunnan Province; it is one of the most important gold-polymetallic metallogenic belt on Sanjiang region to the south-west of China. At the same time, it is one of the 16 important metallogenic belt of the new round of prospecting geological work.. Ailaoshan region is transforming to the most important gold-polymetallic mineral survey to the western china. Ailaoshan metallogenic belt experienced strong tectonic movement and frequently magmatic activities and varying metamorphisms. Tectonic belt forming conditions decided the multi-stages of the mineralization. And the favorable metallogenic condition is determined by the geological and the structure condition. The output of various mineral resources is quite rich. Since years before, geologists has focus on the basis geologic research and prospecting in Ailaoshan region. In these years, several large scale deposits have been found such as Mojiang Jinchang gold-nickel, Dianyuan Laowangzhai and Donggualin golden deposits Yuanyang Daping gold-polymetallic deposits. Meanwhile, the resource potential in the study area is huge .Finding the new resource has became the key quest of the mining industry development at present. What’s more, it is also the main purpose in this paper. I. Geological information shows that the study area is exposed fully in stratigraphy based on geological study. Lower proterozoic basalts influence much greater than others. The main faults directions are NW and NS. The NS fault cut the NS trend one and do the Ailaoshan metallogenic belt apart. With the regional structural movements there’s multi-phase magma activities. Almost golden deposits are distributed in the shallow metamorphic belt and located on the top of secondary faults in Jiujia-Dingmou deep fault. II. Aeromagnetic data is processing by upward extending 40㎞, 20㎞, 10㎞, 5㎞ directions. Extract a 0 value line of vertical second derivative. Interpreting the aeromagnetic data from the magnetic of the study region, the geological conditions of gold mineralization are inferred. Such phenomena before as the structure, strata and intrusive rocks extract the interpretative aeromagnetic of the strata, intrusive rocks and structure. The structure framework is pointed out through the relevance data of different heights. A set of faults of the NW trend are found that control the multi-metal deposits. Delineating the location of buried rock found that the NW trend basement controls the distribution of the basalt cap. III. Processing the 1:200000 hydrographic sediment of study region on F-Krieger method, the concentrated regions of gold-poly metallic elements are point out. 37 gold anomaly areas are delineated. The distribution of the anomaly areas is in groups and belts. Ailaoshan gold mineralization of gold, copper banding the edge of control with the base, generally in the range of development of the basement rock body. Therefore, the contact zone in the North West development of gold and copper anomalies. Lead, zinc, silver and abnormal development of the contact zone in the southeast. To rock as the center, forming asymmetric element zoning characteristics. IV. Based on the theory of synthetic information mineralization prediction, the metallogenic prognosis is worked with the target areas delineated in the study region and statistical units were delineated. There are 7 known units in 37 predicted units. Prediction units have been evaluated through method of the cluster analysis in order to study on the Ore-forming favorability. The location prediction of mineral resources is done. No. 3,8,16 are pointed out that the prediction for the most important long-term gold mine area; 20, 24,26,27,28,29,3l,36units have some prospect, you can work as a follow-up prospecting focus units; compared with the previous two units, 1,2,4,5,10,12,13,17,18,19,21,23, 34,35units are forming a favorable low, as long-term reserve prospecting units. This can be provided a scientific basis for the next phase of exploration in Ailaoshan region. In the end, a assessment of regionalpotential gold reserve in Ailaoshan region is simulated on MonteCarlo method. It comes to a conclusion that the gold reserve in Ailaoshan region goes biggish potential, and the probability of mineralizing is 1868.lt with 90% percent, 4167.4t with 10% percent, 3017.7 tons with 50% percent. Keywords: Ailaoshan, mineral resources prognosis, geological variables, geochemical composition anomaly, orientation prediction, quantitative prediction

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