The tin (Sn)-tungsten (W) polymetallic ore concentrated district in SE Yunnan is distributed at the junction region of the Yangtze Block, the Cathaysian Block and the Indosinian Block, where there are several giant deposits of tin, tungsten, copper, silver, lead, zinc and indium closely associated with a large scale Late Cretaceous magmatism. Bi-dimensional empirical mode decomposition (BEMD) is used to extract aeromagnetic anomalous components at the survey scale of 1: 200 000 from the original aeromagnetic data of SE Yunnan. Four intrinsic mode functions (IMFs) and a residues component are obtained, which may reflect the geological structures and geological bodies at different spatial scales from high frequency to low frequency. The results are shown as follows: (1) Two different types of Precambrian basement in the study area were recognized: one is the Yangtze Block basement characterized by a strong positive magnetic anomaly, the other is the Cathaysian Block basement with a weak negative magnetic anomaly. The former consists of high grade metamorphic rocks including metamorphosed basic igneous rocks, while the latter consists of low grade metamorphosed sedimentary rocks. (2) The aeromagnetic anomalies associated with Sn-W polymetallic mineralization and related to granites in the study area illustrate a pattern of a skarnized alteration-mineralization zone with a positive ring magnetic anomaly enclosing a granitic intrusion with negative magnetic anomaly; (3) The ring positive magnetic anomaly zones enclosing the negative magnetic anomaly are defined as the Sn-W polymetallic ore-searching targets in the study area.

云南东南部锡（锡）钨（W）多金属矿集中区分布在扬子区块，华夏区块和印度支那区块的交界处，那里有几处锡，钨，铜，银的巨大矿床，铅，锌和铟与大型晚白垩世岩浆作用密切相关。二维经验模态分解（BEMD）用于从东南云南的原始航空磁数据中提取比例为1：200 000的航空磁异常分量。获得了四个固有模式函数（IMF）和一个残差分量，它们可以反映从高频到低频在不同空间尺度上的地质结构和地质体。结果显示如下：（1）在研究区域中识别出两种不同类型的前寒武纪基底：一个是扬子地层基底，其特征是强正磁异常，另一个是华夏地块基底，其特征是弱负磁异常。前者由高品位变质岩组成，包括变质的基本火成岩，而后者由低品位变质沉积岩组成。（2）研究区域与锡-钨多金属矿化有关并与花岗岩有关的航空磁异常说明了一个矽卡岩化蚀变-矿化带的模式，正磁环磁异常包裹着花岗岩侵入体，而磁磁负异常。（3）将围绕负磁异常的环形正磁异常带定义为研究区域的Sn-W多金属找矿目标。