【作者】 弓小平；

【导师】 王世称；

【作者基本信息】 吉林大学 ， 地球探测与信息技术， 2005， 博士

【摘要】 本文以综合信息成矿预测理论与方法体系为指导,以寻找大中型金矿床为主攻目标,以1:5万航测、区调、化探资料为基础,对萨尔布拉克一带进行综合找矿信息提取研究,建立以异常密集区为预测单元的综合信息成矿预测模型,并利用数量化理论进行资源量预测和大中型金矿综合成矿靶区预测。 在全面、系统收集和研究萨尔布拉克地区地质、地球物理、地球化学、矿产普查和科研资料的基础上,深入分析金矿成矿地质条件、控矿因素和找矿方法组合,对预测区内的95条断裂的地质、地球物理、地球化学特征进行了全面统计分析,确定了42条赋金断裂。其中早期断裂8条,占19%;晚期断裂34条,占81%。 在萨尔布拉克一带运用综合信息成矿预测理论与方法体系进行综合信息成矿预测,圈定了19个找矿靶区,评定为三类,优选出Ⅰ类靶区11处、Ⅱ类靶区3处、Ⅲ类靶区5处。指出了进一步工作建议。 综合研究与野外生产结合,对预测区内21个预测单元进行定位排序,成矿预测指导矿产预查部署,对排序1-6号六个靶区提出了检查验证工作建议。研究发现该区隐伏线型构造交汇处、隐伏基底边缘、隐伏岩体接触带和港湾处对金铜成矿有利。以环线交汇最好,线线交汇稍差。提出了该区成矿规律是:地层对找金矿指导意义不强;矿区内的已知金矿体群或矿体,均分布在隐伏岩体旁侧的缓倾斜面上或岩体的倾伏端和扬起端;断裂线交汇和环线交汇位置对金矿化和矿体分布更为重要,尤其是环线交汇中不但有较大矿体出现,而且矿体变宽品位变富;矿区中部的北西向金高背景带内绝大多数(91%)评序为Ⅰ类金异常,在岩体旁侧或端部的赋金断裂附近的这类金异常具有发现新的金矿体的较大可能性;ArrAs、AuSb组合异常中,复合球型或块金模型的部位,以最小范围控制着已知金矿体群和矿体,在大于0.5的球型模型或块金模型异常内找金矿体最有利,若大于0.5的球型模型或块金模型显示良好套合时,则有希望发现新矿体,且套合程度愈高,发现新矿体的可能性愈大;矿体蚀变带是直接找矿的明显标志,蚀变作用愈强,金矿化愈好。从而创造了新疆地区成矿预测的较好范例。 对萨尔布拉克金矿区的下一步勘查评价工作提出了新建议。认为该金矿区经过10余年地质找矿开发,近年应以寻找近地表矿体为主。采取重点突破、带动一般的方式,从矿区中段的北西部分开始,逐步向西段推进。具体部署建议分三个阶段,每个阶段均部署有具体评价靶区和具体建议施工的探槽。更多还原

【Abstract】 Synthetic information mineralization prediction (SIMP) makes up one important component part of mathematical geology. Using the theory and method of SIMP, based on the data of 1 : 50000 aerial surveys and 1 : 50000 regional geology surveys, and combined with the materials of 1 : 50000 geochemical exploration (arsenopyrite involved) and 1 : 200000 water system sediment measurement, synthetic information research is made. Information of regional geological conditions, mineralization geophysical conditions, and mineralization geological- geophysical-geochemical material of the mining area in Sarbulak region is extracted. Synthetic information model of classical mineral deposit is set up, synthetic information prediction of large-middle scale gold (copper) mine is made and gold (copper) mine exploration targets are proposed,.This research work is directed by the theory and method of SIMP, and its main goal is to find large-middle scale gold (copper) mine, based on systematic collection of geological, geophysical prospecting, geochemical exploration, remote sensing data, and data from mine geology and scientific research, and new exploration progress in Sarbulak. Using the theory and method of SIMP, we study and process the material of geophysical prospecting, geochemical exploration and geology, evaluate favorability of all kinds of ore control factors, set up synthetic information mineralization prediction model for prediction unit with farther dense anomalies, and made resource prediction by numerical theory and delineated prediction targets.1. Based on the collection of geology, geophysics, geochemistry, mine survey and scientific research, we discussed the ore-forming geological conditions, and ore-controlling factors, These work lies a good base for the synthetic information prediction in Sarbulak and its vicinity, and are meaningful for ore prediction and geological survey insimilar regions.About 20 magmatic intrusion bodies of different size and composition can be seen in this region, from basic rock to acid rock. Among them the migmatitic granite body located in Ererqis compressive belt along NW-SE direction and being, consistent with trend of strata, is the biggest,We statistic and analysis the geological, geophysical and geochemical characterizing of 95 faults in studied area, confirmed that there are 42 gold-control faults. Among them, there are 3 gravity faults, 2 aeromagnetic faults, 3 gravity faults with aeromagnetic faults. There are 11 gravity faults of later stage, 16 aerial magnesium faults, 7 gravity with aerial magnesium faults. The total number of early faults is 8, 19%, later faults is 34. This shows that later faults are more important in mine than the early faults.2. Using the theory and method system of SIMP, we delineated mine targets, chose 3 first rank gold targets and 3 second rank ones. In Sarbulak mine we chose 11 first rank gold targets, 3 second rank ones and 5 third rank ones. We also pointed out main types for further work.According to the distribution of gold-containing intrusions, gold anomalies and gold-containing structures, we divide the gold district into 21 units.According to the locations of gold-containing intrusions, faults, scale of gold residual anomaly and anomalies of Au Sb or Au As and so on, we have divided 19 ore exploration targets by fault boundary. The criterion for them are as the followings: (1) the most favor exploration targets are located on the gentle side or two sides of the gold-containing intrusions. (2) First rank gold-containing fault is better than second rank gold-containing fault, and the second rank one is better than the third rank one. Line-loop joining is better than line-line joining. (3) Large-scale residual Au anomaly is better than small-scale one. (4) Assemblages of Au Sb or Au As appears in residual Au anomaies plays an important instructive role. The larger, the anomaly scale, the higher, the superposition, the stronger, the instructive role. (5) Known ore bodies or ore body in target area are instructive for evaluation of the target area and the distribution of the mineralization altered zones also play an important instructive role.The 19 exploration targets can be classified into three ranks, 11 targets are of bestcondition of ore-forming (the number is 4n 5^ 9~17), 3 targets the middle (the number Is 2> 7> 8) and 5 targets are of weak information.3. The research of this paper directly link with field work, the result of metallogenic prognosis can guild us to do mineral prospecting, and the testing results could be used for comprehensive research. This work set up a good example of metallogenic prognosis. After statistics and evaluating, the 21 unites in this area are ranked. On the basis of comprehensive statistics and research, suggestion for further working on the first 6 units was given.4. Comparing with other metallogenic prediction methods, synthetic information metallogenic forecasting uses the regional aeromagnetic, gravity and chemistry explore material more systematic ally and to their maximum extent. With help of the aeromagnetic data and the gravity, navigating magnetism and geology information in the research area, deduced that the hidden foundation, neutral-acidic lithesome, basic-ultra basic litho some in Sarbulak. It is said that the linear structure intersection, the edge of hidden foundation, the contact and estuary of hidden litho some are advantageous to ore-forming of Au and Cu, at the same time, the ore bearing is better because of the great variation and concentrated coefficient of Au in Carboniferous and Devonian, but the ore bearing is worse in simian for its high variation concentrated and low concentrated coefficient. Further more, the ring and line intersect in the fault intersect formality is beneficial to ore forming while the line and line intersect is poor for ore forming.5. Based on the geology, geophysics, geochemistry and the ore controls, we summarized about the mineralization in the area is as follows:(1) Stratigraphy is not meaningful for gold ore body.(2)The known ore bodies are mostly distributed on the sides of gently dipping intrusion, or their ends, which shows the important role to ore body and has the significant indication to find out ore body.(3)The joining of faults constructive line take an important role at the gold mineralization, and loop joining position is more important, not only to the appearance of the bigger ore body, but also to the present of higher grade ores, which has the value to search new ore body.更多还原