【作者】 郭衍游；

【导师】 唐菊兴； 徐仕海； 胡昌生；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2003， 硕士

【摘要】 西南三江北段成矿带是我国最重要的有色金属成矿带之一，Cu、Pb、Zn、Ag储量丰富，并且地处喜马拉雅构造域的弧形拐弯地段，构造位置独特。研究其成矿规律不仅具有重大的经济意义，还对特殊地质、地理条件下的成矿学研究有一定的促进作用。在新技术、新理论层出不穷的今天，矿床学也向系统化、信息化、智能化发展。本文运用GIS技术，综合分析各种地质资料，在GIS平台上详细研究了西南三江北段区域成矿规律。 在全面了解区域基础地质、矿产地质后，以MAPGIS为平台，建立了完整的西南三江北段地质矿产数据库，并对MAPGIS进行二次开发，实现了地球化学异常的圈定，最后运用GIS空间分析、分形理论等手段对数据库进行信息提取，详细研究了区域成矿规律。研究结果表明： 1．在GIS平台上，选用适当的数学模型，可以提取出GIS数据库中隐含的信息，在区域成矿规律研究中取得了良好效果。 2．元素地球化学场表现出两个方向的特点：一组异常呈北西向展布，受区域构造控制；另一组异常呈北东向展布，与北西向异常交叉呈“V”字形，具有重要找矿意义。 3．金矿床大多赋存于板块结合带内的蛇绿混杂岩带中。 4．张性火山岛弧环境下形成了德格—乡城成矿带，成矿与火山沉积作用密切相关。 5．碰撞造山环境下形成了玉龙—芒康斑岩成矿带和类乌齐—左贡岩浆—热液型成矿带，成矿与岩浆—热液活动密切相关。 6．三叠系地层对区内成矿作用的影响是全局性的，具有为全区矿床的形成提供部分物质来源的能力。更多还原

【Abstract】 Northern three-river metallogenic belt is one of the most important nor-ferrous metal metallogenic belts in our country. Reserves of Cu, Pb, Zn, Ag are very large. The area locates in arc bend of Himalayan Tectonic Region, and is of unique tectonic character. Study on metallogenic regularity of the area is not only valuable on economy, but also on metallogeny theory. With an abundance of new technology and theories coming forth continuously at present, metallogeny tends to be systematized, intelligentized, and integeated with informatics more tightly. This thesis discusses metallogenic regularity of the area detailly on the platform of GIS by using GIS technology and analying all kinds of geology materials synthetically.The thesis introduces regional basic geology and mineral geology of the area at first, then builds full GIS database of northern three-river area, and singles out geochemical anomalies by development on MAPGIS, and finally studies intensively the metallogenic regularity using GIS spatial analysis, fractal theory, etc. The result shows:1. Obscure information can be revealed in studying on metallogenic regularity by applying apporiate mathematic models.2. There are two sets of elements geochemical anomalies: one extends NW, and is controlled by regional faults; the other extends NE, and intersects with the former taking on "V" form, and is important to mineral exploration.3. Almost all Au deposits are situated in greenstone belt of tectonic sutures.4. Dege-Xiangcheng metallogenic belt are formed in stretching vocalnic island arc, and the ore-foming process is related with vocalnic-sedimenting tightly.5. Yulong-Mangkang and Leiwuqi-Zuogong metallogenic belts are formed in collision-orogeny circumstance, and the ore-forming process is related with lava-thermal fluid tightly.6. Triassic strata hold effect on ore forming of the whole area, and can supply some ore-forming substance for deposits there.更多还原