Remote sensing interpretation of surface linear-ring structures and wall-rock alteration in the Lingshan area, Shangrao City, Jiangxi Province, China: implications for mineral prospecting

The Lingshan area in Shangrao City, Jiangxi Province, China, constitutes a favourable prospecting zone for tungsten and polymetallic deposits. While multiple mineralised bodies have been identified within this region, its linear-ring structural features and the distribution of wall-rock alteration remain poorly understood. Utilising Landsat 8 OLI remote sensing imagery as the primary data source, a multi-method integrated approach was employed for remote sensing geological interpretation and alteration information extraction. Optimal spectral band combinations and image fusion enhanced recognition accuracy. During directional filtering, 30% of the original image was re-incorporated into the results, improving linear structural identification. A total of 34 linear structures and 3 ring structures were interpreted. Iron staining and hydroxyl alteration anomalies were extracted using PCA and principal component threshold density segmentation techniques. Integrating geological and surface anomaly data, three new prospecting target areas were delineated, providing a basis for further mineral exploration in this region.