APPLICATION OF BI-DIMENSIONAL EMPIRICAL MODE DECOMPOSITION (BEMD) IN EXTRACTION OF PLATINUM AND PALLADIUM ANOMALIES FEATURES

The bi-dimensional empirical mode decomposition (BEMD) is applied to analyze nonstationary Platinum (Pt) and Palladium (Pd) concentration data in the eastern Yunnan Province, the southwestern China. Two kinds of Pt and Pd anomalies are obtained. One is the regional Pt and Pd anomalies shown in the BIMF3 component; the other is the local Pt and Pd anomalies shown in the BIMF2 component. It has been illustrated by further study that the regional Pt and Pd anomalies associated with the Emeishan basalts formed in Permian are distributed along deep-seated faults such as the Xiaojiang fault and the Xundian-Xuanwei fault, and that the local Pt and Pd anomalies related to Pt and Pd mineralization are distributed along some secondary faults of the deep-seated faults. Thus, the local Pt and Pd anomalies controlled by some secondary faults of the deep-seated faults are prospective areas for finding Pt and Pd deposits. In conclusion, BEMD can be effectively applied in extracting different size of geochemical anomalies.