陕西勉略宁地区致矿地质异常场结构及找矿预测

STRUCTURAL ANALYSIS OF ORE-GENERATING GEOLOGICAL ANOMALY FIELD AND FORECASTING OF ORE PROSPECTING, MIAN-LUE-NING REGION,SHAANXI PROVINCE,CHINA

陕西勉略宁“三角区”构造块体呈楔状夹持在秦岭微板块、扬子陆块和松潘甘孜褶皱带之间，目前已探明多种矿产，成矿作用经历了自新太古代以来不同构造体制下的多次构造、岩浆热事件和变质变形的复杂地质作用，使致矿地质异常切结构复杂化，最新解译的TM遥感线环构造相当发育，走向上可以划分为4组，不同分布和组合的线、环形构造对矿床（点）的分布具有明显不同的控制作用，航磁场呈两带三个方向展布，主要特征为正负异常相随，北陡南缓，铜、金矿床（点）大多分布于正负磁异常的梯度带上，在不同的构造-岩层组合部位，地球化学异常组合具有明显的区别，是寻找不同类型矿床的重要依据，利用致矿地层-构造-物理-化学场组合标志和已知含矿单元的矿床原建立找矿有利度预测模型，对本区进行了新一轮的找矿远景划分，优选找矿靶区10个。

The structural mass in the 'triangular area', Mian-Lue-Ning region, Shaanxi Province, is wedged in between the Qinling microplate,the Yangtze landmass, and the Songpanganzi fold zone. In this mass, several mineral resources have been proved.Since the Neoarchean,the mineralization has undergone several structural and magmatic events,and metamorphic deformations and complex geological activities in different tectonic systems,resulting in the complexity of the ore-generating geological anomaly field structure.The TM remote-sensing linear and circular structures interpreted up to date,well developed,can be classified as four groups in terms of the strkes.The linear and circular structures in different distributions and combinations have produced distinctive different controlling effects on the distributions of the mineral deposts (sites).The anomaly associations between the positive and negative aeromagnetic fields,steep in the north and slow in the south,characterize the aeromagnetic fields,distributed in three directions.The majority of copper and gold deposits(sites) are distributed in the gradient zone of the positive and negative aeromagnetic anomalies.The sharp distinction of the geochemical anomaly association that varies with different positions of the structural-stratigraphic combinations may serve as an important basis for the location of different types of mineral deposits.The indicator for the combination between ore-generating stratigraphic-structural-physical-chemical fields and the forecasting model favorable for the ore-finding established with the known mineral deposit values of the ore-bearing unit can both be used to make a new round of the classification of the prospect area and to locate 10 best prospecting targets.