Research On Collaborative Prospecting Information Extraction Based On Optical And Radar Remote Sensing

Optical and radar remote sensing have played an important role in geological prospecting.The combination of two kinds of remote sensing data for prospecting information extraction can improve the prospecting effect and assist mineral exploration.The study area is located in the Zhaxigang area at the western end of the Bangong Lake-Nujiang suture zone in Tibet.Through the study of typical deposits,This paper selects ASTER optical remote sensing data and PALSAR radar remote sensing data for alteration information,lithology information and structural information extraction.According to the remote sensing prospecting model,the prospecting and verification work are carried out.Through the above work,the main knowledge and achievements are as follows:(1)Research on typical regional deposits can improve remote sensing prospecting efficiency.This work studies the Duobuza porphyry copper(gold)deposit as a typical deposit.The geological data of the deposit is summarized and the remote sensing prospecting model is established.The remote sensing prospecting parameters are clear,making the selection of remote sensing data and the extraction of remote sensing prospecting information more targeted.(2)The image model method can assist in the selection of methods for remote sensing alteration information extraction.It establishes a 9-dimensional spatial image model of ASTER data based on the spectral characteristics of typical altered minerals and disturbing ground objects.The image model can better reflect the response degree of ground objects to different remote sensing alteration information extraction methods,and provide assistance for removing interference features and selecting information extraction methods.(3)The combination of optical and radar remote sensing can enrich the prospecting information that can be extracted.Optical remote sensing data can extract remote sensing alteration information as a prospecting parameter,and the three kinds of alteration information extracted by ASTER data have good prospecting significance.Radar remote sensing data has rich spatial texture information and a certain penetration ability.The synergistic use of PALSAR radar data and ASTER optical data can better identify lithology and structure.This work focuses on extracting intermediate-acid rocks,line shapes and annular structures in the study area.Some of the original geological data have been revised through field verification.(4)The application of remote sensing technology in prospecting in Zhaxigang area has achieved remarkable results.The alterations information of Iron staining,magnesium hydroxy and aluminum hydroxyl is widely developed,and most of them are distributed in the shape of ring,strip and line.There are a wide range of intermediate-acid rocks masses in this area.And there are many intersecting tangent phenomena in linear and circular structures.Through the prospecting prediction of the area,copper mineralization and gold mineralization are discovered in a prospecting area,and it is speculated that the area has certain prospecting potential.