四川宁南地区铅锌成矿规律及证据权法成矿预测

【作者】 严冰；

【导师】 阳正熙； 王小春；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2006， 硕士

【摘要】 宁南地区处于扬子地台西缘、康滇地轴东缘凹陷内，位于康滇铅锌成矿带中部，区域内铅锌矿床主要沿甘洛—小江深大断裂带及其分支断裂分布，以中、小型铅锌矿床(点)为主，分布集中，线性分布特征明显。 作者在总结前人区域铅锌矿床研究成果的基础上，进一步分析了宁南地区铅锌成矿有利条件，并以新近探明的宁南跑马铅锌矿床为典型矿床，通过研究矿区地质特征、矿化标志及找矿标志，建立了宁南地区区域铅锌找矿模式。 以区域铅锌找矿模式为基础，应用MAPGIS及Arcview GIS软件，建立了区域地质应用数据库，结合基于Arcview GIS的WofE扩展功能模块，采用证据权法数学预测模型对宁南地区进行区域铅锌成矿预测，划分出5个铅锌成矿预测远景区。研究表明证据权法用于成矿预测，具有方法简单，预测结果可靠性较高的特点，在和Arc-WofE系统结合后，可以使模拟过程更加简便、准确，预测结果更加客观。更多还原

【Abstract】 The Ningnan region is located in the western margin of Yangtze Platform, the eastern margin of the Kang-Dian Axis, and the middle part of the well-known Kang-Dian Pb-Zn metallogenetic belt. The lead-zinc deposits in the region spread along the Ganluo-xiaojiang deep fault zone or sub-fault zone. Most of the Pb-Zn deposits discovered so far are medium or small in size and occur in cluster and zonality.Based on the geological data available, the author analyzes the favorable ore-forming conditions for the Pb-Zn mineralization in Ningnan region, and on the basis of the detailed study of the Paoma deposit, an exploration model for Pb-Zn deposits in the region is developed.By analysing the models of prospect for pb-zn deposit, database layers in the Ningnan region such as geology database, geochemistry database and ore deposits(occurrences) database are abstracted and constructed by the making use of MAPGIS and Arcview GIS software. By integrating with Wofe function module based on Arcview GIS platform, 5 potential areas for Pb-Zn deposits are delineated with evidence weight modeling. The research has shown that the evidence weight model is easy to realize and has reliable results. Integrating with Arc-WofE system, the efficiency and accuracy of modeling predication is obviously improved.更多还原