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基于MATLAB平台编制的奇异值分解(SVD)程序有效地应用于铜石金矿田1∶50000重力数据分解.首先,利用奇异值分解将重力数据分解为一系列的特征值空间;然后运用多重分形技术确立反映不同层次控矿因素的特征空间值的临界值,最后将这些具有不同控矿因素特征的特征空间值按一定的规则进行数据重构.结果获取三幅刻画不同尺度控矿因素的重力异常图像.(1)区域控矿地质因素是位于平邑火山沉积盆地(重力异常值-56～-974μm/s2)南西侧NW向基底隆起(重力异常值-55～567μm/s2)的鞍谷部位(重力异常值-55～51μm/s2),这里为构造上的局部拉张区,控制铜石杂岩体以及所有金矿床的整体分布,是金成矿的有利地段.(2)局部控矿因素是具有重力负异常特征(重力异常值-339～-11μm/s2)的铜石杂岩体和围绕杂岩体形成的具有环形重力正异常(重力异常值37～345μm/s2)接触交代带,斑岩型金矿化位于岩体内部,矽卡岩型金矿化形成于接触带中,而隐爆角砾岩型和卡林型金矿化形成于接触交代带外围;因此,岩体及其环形接触交代带是金矿成矿的潜在地段.(3)具体控矿因素是NE和NW向重力异常反应的两个方向断裂交汇域,几乎所有金矿化都位于这些交汇域,因此,这里是金成矿的远景地段.(4)铜石金矿田具有典型的多重因素控矿的复杂性特征.
The singular value decomposition (SVD) program based on MATLAB platform is effectively applied to the gravity data decomposition of 1: 50000 in Tongshi gold deposit. Firstly, the gravity data is decomposed into a series of eigenvalues by using singular value decomposition. Then, Technology to establish the critical value of the characteristic space value reflecting the ore-control factors at different levels, and finally to reconstruct the data of the feature space with different ore-control factors according to certain rules.Results Three gravimetric data (1) The regional ore-controlling geological factors are the saddleback of the NW-trending basal uplift (gravity anomaly value -55 ~ 567μm / s2) located on the west side of the Pingyi volcanic sedimentary basin (gravity anomaly value -56 ~ -974μm / s2) (Gravity anomaly value -55 ~ 51μm / s2), here is a structural local pull-out zone, controlling the overall distribution of copper-bearing complex and all gold deposits, which is favorable for gold mineralization. (2) Local control The ore element is a copper-rock complex with negative gravity anomaly (gravity anomaly value -339 ~ -11μm / s2) and a contact anomaly (gravity anomaly 37 ~ 345μm / s2) Belt, porphyry type gold mine In the interior of the rock mass, skarn-type gold mineralization is formed in the contact zone, whereas the cryptoexplosive breccia type and Carlin-type gold mineralization form at the periphery of the contact zone; therefore, the rock mass and its annular contact metasomatic zone (3) The specific ore-controlling factors are the intersections of two directions of NE and NW gravity anomalies, and almost all the gold mineralization is located in these intersections. Therefore, here is the gold mineralization (4) The Tongshi gold ore field has the typical complex ore-controlling complexity of multiple factors.