【作者】 丁建华；

【导师】 肖克炎；

【作者基本信息】 中国地质科学院 ， 矿产普查与勘探， 2007， 博士

【摘要】 东天山是中国有色金属、贵金属的重要成矿带,是全国固体矿产资源十六个重点成矿区带之一。该区地层分布齐全,沉积建造多样,地质构造复杂,岩浆活动频繁,变质变形作用明显,成矿历史悠久,成矿地质条件优越,目前的工作程度相对较低,近年来国土资源大调查在该区不断获得新的突破,如找到土屋-延东斑岩型铜矿床、坡北铜镍硫化物矿床等。该区找矿潜力巨大。本文是以陈毓川院士的成矿系列理论为指导,以多元信息成矿预测方法为基本方法,以铜、镍、金为研究重点矿种,在充分搜集分析东天山地区以往地、物、化、遥及矿产勘查资料的基础上,对东天山铜、镍、金的未发现矿产资源开展科学的研究和评价。研究工作中基于GIS平台集成了东天山地区的地质、矿产、化探、物探、重砂、遥感、地理信息、DEM(高程)等数据库,为靶区预测和资源量估算奠定了基础。论文对东天山地区几个典型矿床(土屋斑岩铜矿、黄山铜镍矿、康古尔塔格金矿等)的成矿地质环境、成矿时代、成矿作用等特征进行了系统分析和提炼,建立了这三个典型矿床的描述性模型和预测评价模型。研究区共优选出与活动大陆边缘中酸性侵入岩有关的斑岩型铜矿(土屋式)预测区85个,其中A类预测区10个,B类预测区26个,C类预测区49个,运用面金属量法估算资源量为3264.61万吨,运用品位-吨位蒙特卡罗模拟法对资源量估算的资源量为3103.58万吨。优选出与基性、超基性岩有关的铜、镍(铂、金、硫)矿(黄山式)预测区226个,其中A类预测区11个,B类预测区88个,C类预测区127个,运用品位-吨位蒙特卡罗模拟法对铜、镍资源量进行估算,铜为251.52万吨,镍为71.79万吨。优选出韧性剪切带蚀变岩型金矿(康古尔塔格金矿式)预测区175个,其中A类预测区10个,B类预测区36个,C类预测区129个,运用面金属量法估算金资源量为255.49吨。论文对定量评价方法中的面金属量法进行了改进,提出了根据地质构造建造分区来划分地球化学块体,并分别计算元素地球化学异常下限的方法;论文还对西部工作程度低的地区未发现矿床数的估计方法进行了试验,取得了一定的效果;论文还针对两种资源量估算方法进行了结比分析。研究工作对土屋西铜、金预测区等6个优选靶区进行了野外验证,其中有2处证实有够品位矿化显示,值得进一步工作。开展了靶区快速查证方法试验研究,试验证明,合理选择和使用轻便的物化探仪器进行综合方法靶区野外查证,效果明显且可缩短找矿工作周期。更多还原

【Abstract】 East Tianshan area is an important metallogenic belt of nonferrous metal and precious metal, and also one of the sixteen important metallogenic regions of non-fuel mineral resources in China. There has complete stratum, multiform sedimentary formations, complicated geologic structure, frequent magmatic activities, obvious metamorphosis, long metallogenic history and ascendant mineralization condition. But, it also has relatively lower working density. The exploration breakthroughs have been made in recent National Land and Resources Survey. Tuwu-Yandong porphyry copper deposit and Pobei copper-nickel sulfide deposit, for instance have been found, which foreshows great potential in this area.Based on mineralization series Theory, which proposed by academician Chen Yuchuan, the multi-information mineral resources assessment method has been used to predict the unfound recourses of copper, nickel and gold in east Tianshan area. During the research, the all-sided data of geologic, deposits(occurrences), geophysical, geochemical and remote sense have been synthetically analyzed again.Individual databases of mineral resources, geochemical, geophysical, Placer, remote sensing, geographic information, DEM and others have been integrated into one integrative database, which established foundation for target areas delineating and resources estimating.In this paper, metallotectonic environment, era and process of several typical deposits (Tuwu porphyry copper deposit, Huangshan copper-nickel deposit, Kangguertage gold deposit, etc.) were studied, of which the describe models and prospecting models have been established.About porphyry copper related to medium-acidic intrudes near active continental margin (Tuwu style), 85 optimal prospective areas were selected out with 10 of class A, 26 of Class B and 49 of Class C. Total resource is 32.6461 Mt (estimated by areal productivity method) or 31.0358Mt (estimated by grade-tonnage Monte Carlo Simulation method)About sulfide copper, nickel (platinum, gold) deposits related to basic-ultrabasic rocks (Huangshan style), 226 optimal prospective areas were selected out with 11 of class A, 88 of Class B and 137 of Class C. Total resource of copper of this style is 2.5152 Mt (estimated by areal productivity method) or 0.7179 Mt (estimated by grade-tonnage Monte Carlo Simulation method).About gold deposits related to alternation rock in ductile shear zone (Kangguertage style), 175 optimal prospective areas were selected out with 10 of class A, 36 of Class B and 129 of Class C. Total resource is 255.49 ton (estimated by areal productivity method).Improvement of areal productivity method has been made in this thesis. The author proposed that the lower limit of geochemical anomaly should be determined individually according to the geological structure and formation distribution. Experiment was made on how to estimate the number of undiscovered deposits in lower working density area, and certain result was achieved.Field works were done in 6 target areas to verify the effect of the assessment method. Two of them were approved deserve further exploration.A pilot study was launched during field work which showed that properly use of portable instruments of geophysical and geochemical will shorten the prospecting cycle distinctively.更多还原