【作者】 薛顺荣；

【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， 2008， 博士

【摘要】 论文以成矿地质背景分析、成矿规律和典型矿床研究为基础,以区域成矿系列理论为指导,多源综合信息浓缩与类比、求同求异的新思维和矿产资源评价定量技术为手段,建立基于GIS技术平台的固体矿产资源评价系统（MRAS）为核心的“三三”式矿产资源评价方法为研究思路。围绕研究思路,在系统收集研究区已有的地、物、化、遥等资料基础上,通过对各类地学信息的重新处理和解译,从地层与岩相建造、地质构造、岩浆岩、矿产、重力、航磁、水系沉积物、重砂、遥感等方面分析了区域成矿地质背景,并特别探讨了不进一步划分地质背景和划分地质背景的元素含量组合特征、异常分布与地质构造单元的关系,论述了研究区优势矿产为格咱河断裂与三江口—剑川断裂间的普朗—麻花坪地区与印支期、燕山晚期浅成—超浅成中酸性侵入岩和喜马拉雅期富碱斑岩有关的斑岩型铜多金属矿,其中以与印支期中酸性斑岩有关的斑岩型、矽卡岩—斑岩型铜多金属矿为重点。通过优势矿产资源成矿规律和普朗、红山及北衙典型矿床研究,从统计的观点,定性或定量的概括了地、物、化和遥等直接或间接找矿信息对优势矿产的控矿作用,概括了典型矿床成矿地质背景、矿床地质特征、矿体特征,并建立了成因模式。根据岩浆侵入岩体、矿床点产出的地质构造背景、时空分布、成矿作用,划分并总结了普朗—麻花坪地区的成矿带、成矿系列特征,建立了成矿系列的概念性区域成矿模式。以普朗—麻花坪地区与印支期中酸性斑岩有关的铜多金属矿成矿系列为重点,在已知矿床点与区域地质、重力、航磁、水系沉积物、重砂和遥感等直接或间接找矿信息的空间有机关联分析的基础上,以成矿系列的区域成矿模式为指导,提取和构置了矿床点,出露中酸性岩体,重磁、地球化学和遥感信息推测隐伏中酸性岩体,断裂、重磁线型构造和遥感线性构造影响宽度（BUFFER区）,重磁上延5km负剩余异常区和莫霍面的幔坡带,以及Cu元素和Cu-W-Mo、Cu-W-Mo-Au-K₂O及Pb-Zn-Ag累加指数异常区,大于5个标准单位和大于10个标准单位的各铜矿物异常汇水盆地等各类地学成矿信息预测变量,以地质统计单元为桥梁,基于MARS系统证据权重法建立了该区综合信息找矿预测证据权重模型,按2×2网格单元对该区优势矿产资源进行了定位评价,以后验概率定量划分了A、B、C三个级别的找矿预测远景区,并与已知铜多金属矿床点关联,编制了该区基于MRAS证据权重法后验概率找矿预测图,从地质角度对找矿预测远景区进行了评价。同时,以普朗—麻花坪地区已有1:20万、1:5万地质矿产调查出露中酸性岩体,重磁、地球化学和遥感推测隐伏中酸性岩体为主,结合断裂构造,重力、航磁和遥感线性解译构造,以及水系沉积物测量成矿元素异常、铜矿物重砂异常汇水盆地,遵循“地质体为单元,面积尽可能小且基本一致”的原则,定性圈定了45个评价矿种成矿有利地段,其中32个为出露中酸性岩体成矿有利地段,13个为推测隐伏中酸性岩体成矿有利地段,运用面金属量法对各成矿有利地段铜多金属矿潜在资源量进行估算,全区预测资源总量:铜13624万吨,金9026吨,银2557万吨,铅1525万吨,锌1199万吨,钨10736万吨,钼466万吨,铍373万吨。并以定性和定量综合成矿信息相结合,系统评价了该区斑岩型铜多金属矿成矿系列找矿潜力和具有大型规模远景的找矿有利地段,提出该区面积性、矿产勘查和重点矿产勘查分层次,分步逐渐实施的寻找大型—超大型铜多金属矿的工作部署建议。更多还原

【Abstract】 Directed by regional minerogenetic series theory,based on the analysis of minerogenetic geologic background,mineralization law and representative deposits,multi-source integrate information method and difference-seeking method were used here."Three-three" research approach for none-fuel mineral appraisal was established with core thought of Mineral Resource Assessment System（MRAS） on GIS platform.During research,geologic data of geological,geophysical,geochemical and remote sensing was collected and reinterpreted.The regional metallogeny background was analyzed base on research of strata and petrographic formation,geologic structure,magmatic rocks, mineral occurrences,gravity,magnetism,stream sediment,heavy sand and remote sensing. The relationship between geologic setting dividing,element combination,anomaly distribution and tectonic units was discussed.It was put forward that the perspective mineral deposit is porphyry copper deposit in Pulang-Mahuaping Area,which located between Geza river fault and Sanjiangkou-Jianchuan fault.The related magmatic rock are intermediate-acid intrusive rocks of Indo-Sinian Stage and Upper Stage of Yanshan,and alkali-rich porphyry of Himalayan Stage.After dissected representative copper deposits such as Pulang,Hongshan,and Beiya,the ore-control actions of geological,geophysical,geochemical and remote sensing were outlined qualitatively and quantitatively.The genetic model was established based on summarizing of metallogenic geological background,geological features of ore-body and deposit.Characters of minerogenetic series of Pulang-Mahuaping area were sum up,and regional metallogenic model was built up.With the guidance of the regional metallogenic model,on the basis of associative and integrated analysis of directed and undirected data of known deposits,i.e.regional geology, regional gravity,aeromagnetic,stream sediment survey,heavy sand wervey and remote sense data,different variates were extracted and constructed,including:occurrences;exposed intermediate-acid intrusive rocks;supposed intermediate-acid intrusive rocks deduced from geophysical,geochemical and remote sense data;faults,supposed linetype structures; negative residual abnormals area extended up to 5km on the maps of gravity and magnetism; the transition belt of between mantle syncline and mantle anticline;abnormals of Cu, CuWMo、CuWMoAuK₂O and PbZnAg;catchment basins of copper mineral abnormals delineated with 5 standard unit and 10 standard unit.Integrating information prospecting evidence weight was built by using MARS software based on geological statistic units.Grid cell of 2km×2km were used to calculate and predicted the locations.Prospecting areas were classified into A,B and C level.Finally,prospecting map was compiled and prospecting areas were appraised from geological aspect.By analysis of Geological and Mineral Resources Survey scaled 1:200000 and 1:50000, and deduced from geo-data of gravity-magnetic,geochemical and RS,some ore-controlling factors were extracted,which are intermediate-acid intrusive rocks,interpreted structures, geochemical anomalies and catchment basins of heavy mineral anomalies of copper.Followed the principle of "geologic body as appraisal unit,coverage as small as possible",45 possible areas were delineated,32 of which have outcrops of intermediate-acid intrusive rock,and 13 have hidden rock bodies.Resource quantity estimation with areal productivity method shows the metal quantities in working area are:copper 13,624 million tons,gold 9,026 ton,silver 2,557 million tons,lead 1,525 million tons,zinc 1,199 million tons,tungsten 10,736 million tons,molybdenum 466 million tons,beryllium 373 million tons.Minerogenetic series of copper polymetallic deposits has been identified and favorable areas with large metal potential were delineated.Further work for exploring large and super-large copper polymetallic deposits was suggested by the authors.更多还原